MM-45956: Optimize FileInfo stats query (#22603)

* MM-45956: Optimize FileInfo stats query

We Denormalize Post.ChannelId on FileInfo.ChannelId

```release-note
The file info stats query is now optimized by denormalizing the channelID column into the table itself. This will speed up the query to get the file count for a channel on clicking the RHS.

Migration times:
On a MySQL 8.0.31 DB with
1405 rows in FileInfo and 11M posts, it took around 0.3s

On a Postgres 12.14 DB with
1731 rows in FileInfo and 11M posts, it took around 0.27s
```

https://mattermost.atlassian.net/browse/MM-45956

model/file_info.go

@@ -36,10 +36,14 @@ type GetFileInfosOptions struct {
 }
 
 type FileInfo struct {
-	Id              string  `json:"id"`
-	CreatorId       string  `json:"user_id"`
-	PostId          string  `json:"post_id,omitempty"`
-	ChannelId       string  `db:"-" json:"channel_id"`
+	Id        string `json:"id"`
+	CreatorId string `json:"user_id"`
+	PostId    string `json:"post_id,omitempty"`
+	// ChannelId is the denormalized value from the corresponding post. Note that this value is
+	// potentially distinct from the ChannelId provided when the file is first uploaded and
+	// used to organize the directories in the file store, since in theory that same file
+	// could be attached to a post from a different channel (or not attached to a post at all).
+	ChannelId       string  `json:"channel_id"`
 	CreateAt        int64   `json:"create_at"`
 	UpdateAt        int64   `json:"update_at"`
 	DeleteAt        int64   `json:"delete_at"`

server/channels/api4/file_test.go

@@ -916,7 +916,7 @@ func TestGetFileLink(t *testing.T) {
 	CheckBadRequestStatus(t, resp)
 
 	// Hacky way to assign file to a post (usually would be done by CreatePost call)
-	err = th.App.Srv().Store().FileInfo().AttachToPost(fileId, th.BasicPost.Id, th.BasicUser.Id)
+	err = th.App.Srv().Store().FileInfo().AttachToPost(fileId, th.BasicPost.Id, th.BasicPost.ChannelId, th.BasicUser.Id)
 	require.NoError(t, err)
 
 	th.App.UpdateConfig(func(cfg *model.Config) { *cfg.FileSettings.EnablePublicLink = false })
@@ -1074,7 +1074,7 @@ func TestGetPublicFile(t *testing.T) {
 	fileId := fileResp.FileInfos[0].Id
 
 	// Hacky way to assign file to a post (usually would be done by CreatePost call)
-	err = th.App.Srv().Store().FileInfo().AttachToPost(fileId, th.BasicPost.Id, th.BasicUser.Id)
+	err = th.App.Srv().Store().FileInfo().AttachToPost(fileId, th.BasicPost.Id, th.BasicPost.ChannelId, th.BasicUser.Id)
 	require.NoError(t, err)
 
 	info, err := th.App.Srv().Store().FileInfo().Get(fileId)
@@ -1139,25 +1139,25 @@ func TestSearchFiles(t *testing.T) {
 	filename := "search for fileInfo1"
 	fileInfo1, appErr := th.App.UploadFile(th.Context, data, th.BasicChannel.Id, filename)
 	require.Nil(t, appErr)
-	err = th.App.Srv().Store().FileInfo().AttachToPost(fileInfo1.Id, th.BasicPost.Id, th.BasicUser.Id)
+	err = th.App.Srv().Store().FileInfo().AttachToPost(fileInfo1.Id, th.BasicPost.Id, th.BasicPost.ChannelId, th.BasicUser.Id)
 	require.NoError(t, err)
 
 	filename = "search for fileInfo2"
 	fileInfo2, appErr := th.App.UploadFile(th.Context, data, th.BasicChannel.Id, filename)
 	require.Nil(t, appErr)
-	err = th.App.Srv().Store().FileInfo().AttachToPost(fileInfo2.Id, th.BasicPost.Id, th.BasicUser.Id)
+	err = th.App.Srv().Store().FileInfo().AttachToPost(fileInfo2.Id, th.BasicPost.Id, th.BasicPost.ChannelId, th.BasicUser.Id)
 	require.NoError(t, err)
 
 	filename = "tagged search for fileInfo3"
 	fileInfo3, appErr := th.App.UploadFile(th.Context, data, th.BasicChannel.Id, filename)
 	require.Nil(t, appErr)
-	err = th.App.Srv().Store().FileInfo().AttachToPost(fileInfo3.Id, th.BasicPost.Id, th.BasicUser.Id)
+	err = th.App.Srv().Store().FileInfo().AttachToPost(fileInfo3.Id, th.BasicPost.Id, th.BasicPost.ChannelId, th.BasicUser.Id)
 	require.NoError(t, err)
 
 	filename = "tagged for fileInfo4"
 	fileInfo4, appErr := th.App.UploadFile(th.Context, data, th.BasicChannel.Id, filename)
 	require.Nil(t, appErr)
-	err = th.App.Srv().Store().FileInfo().AttachToPost(fileInfo4.Id, th.BasicPost.Id, th.BasicUser.Id)
+	err = th.App.Srv().Store().FileInfo().AttachToPost(fileInfo4.Id, th.BasicPost.Id, th.BasicPost.ChannelId, th.BasicUser.Id)
 	require.NoError(t, err)
 
 	archivedChannel := th.CreatePublicChannel()
@@ -1166,7 +1166,7 @@ func TestSearchFiles(t *testing.T) {
 	post := &model.Post{ChannelId: archivedChannel.Id, Message: model.NewId() + "a"}
 	rpost, _, err := client.CreatePost(post)
 	require.NoError(t, err)
-	err = th.App.Srv().Store().FileInfo().AttachToPost(fileInfo5.Id, rpost.Id, th.BasicUser.Id)
+	err = th.App.Srv().Store().FileInfo().AttachToPost(fileInfo5.Id, rpost.Id, rpost.ChannelId, th.BasicUser.Id)
 	require.NoError(t, err)
 	th.Client.DeleteChannel(archivedChannel.Id)
 

server/channels/app/file.go

@@ -274,6 +274,7 @@ func (a *App) getInfoForFilename(post *model.Post, teamID, channelID, userID, ol
 	info.Id = model.NewId()
 	info.CreatorId = post.UserId
 	info.PostId = post.Id
+	info.ChannelId = post.ChannelId
 	info.CreateAt = post.CreateAt
 	info.UpdateAt = post.UpdateAt
 	info.Path = path
@@ -1214,6 +1215,7 @@ func (a *App) CopyFileInfos(userID string, fileIDs []string) ([]string, *model.A
 		fileInfo.CreateAt = now
 		fileInfo.UpdateAt = now
 		fileInfo.PostId = ""
+		fileInfo.ChannelId = ""
 
 		if _, err := a.Srv().Store().FileInfo().Save(fileInfo); err != nil {
 			var appErr *model.AppError

server/channels/app/file_test.go

@@ -368,6 +368,7 @@ func TestSearchFilesInTeamForUser(t *testing.T) {
 			fileInfo, err := th.App.Srv().Store().FileInfo().Save(&model.FileInfo{
 				CreatorId: th.BasicUser.Id,
 				PostId:    th.BasicPost.Id,
+				ChannelId: th.BasicPost.ChannelId,
 				Name:      searchTerm,
 				Path:      searchTerm,
 				Extension: "jpg",

server/channels/app/import_functions.go

@@ -1638,7 +1638,7 @@ func (a *App) uploadAttachments(c request.CTX, attachments *[]imports.Attachment
 
 func (a *App) updateFileInfoWithPostId(post *model.Post) {
 	for _, fileID := range post.FileIds {
-		if err := a.Srv().Store().FileInfo().AttachToPost(fileID, post.Id, post.UserId); err != nil {
+		if err := a.Srv().Store().FileInfo().AttachToPost(fileID, post.Id, post.ChannelId, post.UserId); err != nil {
 			mlog.Error("Error attaching files to post.", mlog.String("post_id", post.Id), mlog.Any("post_file_ids", post.FileIds), mlog.Err(err))
 		}
 	}

server/channels/app/post.go

@@ -416,7 +416,7 @@ func (a *App) addPostPreviewProp(post *model.Post) (*model.Post, error) {
 func (a *App) attachFilesToPost(post *model.Post) *model.AppError {
 	var attachedIds []string
 	for _, fileID := range post.FileIds {
-		err := a.Srv().Store().FileInfo().AttachToPost(fileID, post.Id, post.UserId)
+		err := a.Srv().Store().FileInfo().AttachToPost(fileID, post.Id, post.ChannelId, post.UserId)
 		if err != nil {
 			mlog.Warn("Failed to attach file to post", mlog.String("file_id", fileID), mlog.String("post_id", post.Id), mlog.Err(err))
 			continue

server/channels/db/migrations/migrations.list

@@ -210,6 +210,8 @@ channels/db/migrations/mysql/000104_upgrade_notifyadmin.down.sql
 channels/db/migrations/mysql/000104_upgrade_notifyadmin.up.sql
 channels/db/migrations/mysql/000105_remove_tokens.down.sql
 channels/db/migrations/mysql/000105_remove_tokens.up.sql
+channels/db/migrations/mysql/000106_fileinfo_channelid.down.sql
+channels/db/migrations/mysql/000106_fileinfo_channelid.up.sql
 channels/db/migrations/postgres/000001_create_teams.down.sql
 channels/db/migrations/postgres/000001_create_teams.up.sql
 channels/db/migrations/postgres/000002_create_team_members.down.sql
@@ -420,3 +422,5 @@ channels/db/migrations/postgres/000104_upgrade_notifyadmin.down.sql
 channels/db/migrations/postgres/000104_upgrade_notifyadmin.up.sql
 channels/db/migrations/postgres/000105_remove_tokens.down.sql
 channels/db/migrations/postgres/000105_remove_tokens.up.sql
+channels/db/migrations/postgres/000106_fileinfo_channelid.down.sql
+channels/db/migrations/postgres/000106_fileinfo_channelid.up.sql

server/channels/db/migrations/mysql/000106_fileinfo_channelid.down.sql

@@ -0,0 +1,29 @@
+SET @preparedStatement = (SELECT IF(
+    EXISTS(
+        SELECT 1 FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'FileInfo'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_fileinfo_channel_id_create_at'
+    ) > 0,
+    'DROP INDEX idx_fileinfo_channel_id_create_at ON FileInfo;',
+    'SELECT 1'
+));
+
+PREPARE removeIndexIfExists FROM @preparedStatement;
+EXECUTE removeIndexIfExists;
+DEALLOCATE PREPARE removeIndexIfExists;
+
+SET @preparedStatement = (SELECT IF(
+    EXISTS(
+        SELECT 1 FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'FileInfo'
+        AND table_schema = DATABASE()
+        AND column_name = 'ChannelId'
+    ) > 0,
+    'ALTER TABLE FileInfo DROP COLUMN ChannelId;',
+    'SELECT 1;'
+));
+
+PREPARE removeColumnIfExists FROM @preparedStatement;
+EXECUTE removeColumnIfExists;
+DEALLOCATE PREPARE removeColumnIfExists;

server/channels/db/migrations/mysql/000106_fileinfo_channelid.up.sql

@@ -0,0 +1,34 @@
+SET @preparedStatement = (SELECT IF(
+    NOT EXISTS(
+        SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'FileInfo'
+        AND table_schema = DATABASE()
+        AND column_name = 'ChannelId'
+    ),
+    'ALTER TABLE FileInfo ADD COLUMN ChannelId varchar(26);',
+    'SELECT 1;'
+));
+
+PREPARE addColumnIfNotExists FROM @preparedStatement;
+EXECUTE addColumnIfNotExists;
+DEALLOCATE PREPARE addColumnIfNotExists;
+
+UPDATE FileInfo, Posts
+SET FileInfo.ChannelId = Posts.ChannelId
+WHERE FileInfo.PostId = Posts.Id
+AND FileInfo.ChannelId IS NULL;
+
+SET @preparedStatement = (SELECT IF(
+    NOT EXISTS(
+        SELECT 1 FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'FileInfo'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_fileinfo_channel_id_create_at'
+    ),
+    'CREATE INDEX idx_fileinfo_channel_id_create_at ON FileInfo(ChannelId, CreateAt);',
+    'SELECT 1'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;

server/channels/db/migrations/postgres/000106_fileinfo_channelid.down.sql

@@ -0,0 +1,2 @@
+DROP INDEX IF EXISTS idx_fileinfo_channel_id_create_at;
+ALTER TABLE fileinfo DROP COLUMN IF EXISTS channelid;

server/channels/db/migrations/postgres/000106_fileinfo_channelid.up.sql

@@ -0,0 +1,3 @@
+ALTER TABLE fileinfo ADD COLUMN IF NOT EXISTS channelid varchar(26);
+UPDATE fileinfo SET channelid = posts.channelid FROM posts WHERE fileinfo.channelid IS NULL AND fileinfo.postid = posts.id;
+CREATE INDEX IF NOT EXISTS idx_fileinfo_channel_id_create_at ON fileinfo(channelid, createat);

server/channels/store/opentracinglayer/opentracinglayer.go

@@ -3477,7 +3477,7 @@ func (s *OpenTracingLayerEmojiStore) Search(name string, prefixOnly bool, limit
 	return result, err
 }
 
-func (s *OpenTracingLayerFileInfoStore) AttachToPost(fileID string, postID string, creatorID string) error {
+func (s *OpenTracingLayerFileInfoStore) AttachToPost(fileID string, postID string, channelID string, creatorID string) error {
 	origCtx := s.Root.Store.Context()
 	span, newCtx := tracing.StartSpanWithParentByContext(s.Root.Store.Context(), "FileInfoStore.AttachToPost")
 	s.Root.Store.SetContext(newCtx)
@@ -3486,7 +3486,7 @@ func (s *OpenTracingLayerFileInfoStore) AttachToPost(fileID string, postID strin
 	}()
 
 	defer span.Finish()
-	err := s.FileInfoStore.AttachToPost(fileID, postID, creatorID)
+	err := s.FileInfoStore.AttachToPost(fileID, postID, channelID, creatorID)
 	if err != nil {
 		span.LogFields(spanlog.Error(err))
 		ext.Error.Set(span, true)

server/channels/store/retrylayer/retrylayer.go

@@ -3892,11 +3892,11 @@ func (s *RetryLayerEmojiStore) Search(name string, prefixOnly bool, limit int) (
 
 }
 
-func (s *RetryLayerFileInfoStore) AttachToPost(fileID string, postID string, creatorID string) error {
+func (s *RetryLayerFileInfoStore) AttachToPost(fileID string, postID string, channelID string, creatorID string) error {
 
 	tries := 0
 	for {
-		err := s.FileInfoStore.AttachToPost(fileID, postID, creatorID)
+		err := s.FileInfoStore.AttachToPost(fileID, postID, channelID, creatorID)
 		if err == nil {
 			return nil
 		}

server/channels/store/searchlayer/file_info_layer.go

@@ -112,8 +112,8 @@ func (s SearchFileInfoStore) SetContent(fileID, content string) error {
 	return err
 }
 
-func (s SearchFileInfoStore) AttachToPost(fileId, postId, creatorId string) error {
-	err := s.FileInfoStore.AttachToPost(fileId, postId, creatorId)
+func (s SearchFileInfoStore) AttachToPost(fileId, postId, channelId, creatorId string) error {
+	err := s.FileInfoStore.AttachToPost(fileId, postId, channelId, creatorId)
 	if err == nil {
 		nFileInfo, err2 := s.FileInfoStore.GetFromMaster(fileId)
 		if err2 == nil {

server/channels/store/searchtest/file_info_layer.go

@@ -207,11 +207,11 @@ func testFileInfoSearchFileInfosIncludingDMs(t *testing.T, th *SearchTestHelper)
 	post2, err := th.createPost(th.User.Id, th.ChannelBasic.Id, "dm test", "", model.PostTypeDefault, 0, false)
 	require.NoError(t, err)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "dm test filename", "dm contenttest filename", "jpg", "image/jpeg", 0, 1)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "dm test filename", "dm contenttest filename", "jpg", "image/jpeg", 0, 1)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "dm other filename", "dm other filename", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "dm other filename", "dm other filename", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post2.Id, "channel test filename", "channel contenttest filename", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "channel test filename", "channel contenttest filename", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -248,11 +248,11 @@ func testFileInfoSearchFileInfosWithPagination(t *testing.T, th *SearchTestHelpe
 	post2, err := th.createPost(th.User.Id, th.ChannelBasic.Id, "dm test", "", model.PostTypeDefault, 20000, false)
 	require.NoError(t, err)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "dm test filename", "dm contenttest filename", "jpg", "image/jpeg", 10000, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "dm test filename", "dm contenttest filename", "jpg", "image/jpeg", 10000, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "dm other filename", "dm other filename", "jpg", "image/jpeg", 20000, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "dm other filename", "dm other filename", "jpg", "image/jpeg", 20000, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post2.Id, "channel test filename", "channel contenttest filename", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "channel test filename", "channel contenttest filename", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -292,9 +292,9 @@ func testFileInfoSearchExactPhraseInQuotes(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "channel test 1 2 3 filename", "channel content test 1 2 3 filename", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "channel test 1 2 3 filename", "channel content test 1 2 3 filename", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "channel test 123 filename", "channel content test 123 filename", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "channel test 123 filename", "channel content test 123 filename", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -322,9 +322,9 @@ func testFileInfoSearchEmailAddresses(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "test email test@test.com", "test email test@content.com", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "test email test@test.com", "test email test@content.com", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "test email test2@test.com", "test email test2@content.com", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "test email test2@test.com", "test email test2@content.com", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -373,7 +373,7 @@ func testFileInfoSearchMarkdownUnderscores(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "_start middle end_ _another_", "_start middle end_ _another_", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "_start middle end_ _another_", "_start middle end_ _another_", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -420,9 +420,9 @@ func testFileInfoSearchNonLatinWords(t *testing.T, th *SearchTestHelper) {
 	defer th.deleteUserPosts(th.User.Id)
 
 	t.Run("Should be able to search chinese words", func(t *testing.T) {
-		p1, err := th.createFileInfo(th.User.Id, post.Id, "你好", "你好", "jpg", "image/jpeg", 0, 0)
+		p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "你好", "你好", "jpg", "image/jpeg", 0, 0)
 		require.NoError(t, err)
-		p2, err := th.createFileInfo(th.User.Id, post.Id, "你", "你", "jpg", "image/jpeg", 0, 0)
+		p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "你", "你", "jpg", "image/jpeg", 0, 0)
 		require.NoError(t, err)
 		defer th.deleteUserFileInfos(th.User.Id)
 
@@ -453,7 +453,7 @@ func testFileInfoSearchNonLatinWords(t *testing.T, th *SearchTestHelper) {
 		})
 	})
 	t.Run("Should be able to search cyrillic words", func(t *testing.T) {
-		p1, err := th.createFileInfo(th.User.Id, post.Id, "слово test", "слово test", "jpg", "image/jpeg", 0, 0)
+		p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "слово test", "слово test", "jpg", "image/jpeg", 0, 0)
 		require.NoError(t, err)
 		defer th.deleteUserFileInfos(th.User.Id)
 
@@ -476,9 +476,9 @@ func testFileInfoSearchNonLatinWords(t *testing.T, th *SearchTestHelper) {
 	})
 
 	t.Run("Should be able to search japanese words", func(t *testing.T) {
-		p1, err := th.createFileInfo(th.User.Id, post.Id, "本", "本", "jpg", "image/jpeg", 0, 0)
+		p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "本", "本", "jpg", "image/jpeg", 0, 0)
 		require.NoError(t, err)
-		p2, err := th.createFileInfo(th.User.Id, post.Id, "本木", "本木", "jpg", "image/jpeg", 0, 0)
+		p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "本木", "本木", "jpg", "image/jpeg", 0, 0)
 		require.NoError(t, err)
 		defer th.deleteUserFileInfos(th.User.Id)
 
@@ -511,9 +511,9 @@ func testFileInfoSearchNonLatinWords(t *testing.T, th *SearchTestHelper) {
 	})
 
 	t.Run("Should be able to search korean words", func(t *testing.T) {
-		p1, err := th.createFileInfo(th.User.Id, post.Id, "불", "불", "jpg", "image/jpeg", 0, 0)
+		p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "불", "불", "jpg", "image/jpeg", 0, 0)
 		require.NoError(t, err)
-		p2, err := th.createFileInfo(th.User.Id, post.Id, "불다", "불다", "jpg", "image/jpeg", 0, 0)
+		p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "불다", "불다", "jpg", "image/jpeg", 0, 0)
 		require.NoError(t, err)
 		defer th.deleteUserFileInfos(th.User.Id)
 
@@ -550,9 +550,9 @@ func testFileInfoSearchAlternativeSpellings(t *testing.T, th *SearchTestHelper)
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "Straße test", "Straße test", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "Straße test", "Straße test", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post.Id, "Strasse test", "Strasse test", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "Strasse test", "Strasse test", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -578,9 +578,9 @@ func testFileInfoSearchAlternativeSpellingsAccents(t *testing.T, th *SearchTestH
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "café", "café", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "café", "café", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post.Id, "café", "café", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "café", "café", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -612,9 +612,9 @@ func testFileInfoSearchOrExcludeFileInfosBySpecificUser(t *testing.T, th *Search
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "test fromuser filename", "test fromuser filename", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "test fromuser filename", "test fromuser filename", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User2.Id, post.Id, "test fromuser filename", "test fromuser filename", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User2.Id, post.Id, post.ChannelId, "test fromuser filename", "test fromuser filename", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 	defer th.deleteUserFileInfos(th.User2.Id)
@@ -635,9 +635,9 @@ func testFileInfoSearchOrExcludeFileInfosInChannel(t *testing.T, th *SearchTestH
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "test fromuser filename", "test fromuser filename", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "test fromuser filename", "test fromuser filename", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post2.Id, "test fromuser filename", "test fromuser filename", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "test fromuser filename", "test fromuser filename", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 	defer th.deleteUserFileInfos(th.User2.Id)
@@ -666,9 +666,9 @@ func testFileInfoSearchOrExcludeFileInfosInDMGM(t *testing.T, th *SearchTestHelp
 	defer th.deleteUserPosts(th.User.Id)
 	defer th.deleteUserPosts(th.User2.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post1.Id, "test fromuser", "test fromuser", "jpg", "image/jpg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "test fromuser", "test fromuser", "jpg", "image/jpg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User2.Id, post2.Id, "test fromuser 2", "test fromuser 2", "jpg", "image/jpg", 0, 0)
+	p2, err := th.createFileInfo(th.User2.Id, post2.Id, post2.ChannelId, "test fromuser 2", "test fromuser 2", "jpg", "image/jpg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 	defer th.deleteUserFileInfos(th.User2.Id)
@@ -716,11 +716,11 @@ func testFileInfoSearchOrExcludeByExtensions(t *testing.T, th *SearchTestHelper)
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "test", "test", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "test", "test", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post.Id, "test", "test", "png", "image/png", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "test", "test", "png", "image/png", 0, 0)
 	require.NoError(t, err)
-	p3, err := th.createFileInfo(th.User.Id, post.Id, "test", "test", "bmp", "image/bmp", 0, 0)
+	p3, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "test", "test", "bmp", "image/bmp", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -787,13 +787,13 @@ func testFileInfoFilterFilesInSpecificDate(t *testing.T, th *SearchTestHelper) {
 	defer th.deleteUserPosts(th.User.Id)
 
 	creationDate := model.GetMillisForTime(time.Date(2020, 03, 22, 12, 0, 0, 0, time.UTC))
-	p1, err := th.createFileInfo(th.User.Id, post1.Id, "test in specific date", "test in specific date", "jpg", "image/jpeg", creationDate, 0)
+	p1, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "test in specific date", "test in specific date", "jpg", "image/jpeg", creationDate, 0)
 	require.NoError(t, err)
 	creationDate2 := model.GetMillisForTime(time.Date(2020, 03, 23, 0, 0, 0, 0, time.UTC))
-	p2, err := th.createFileInfo(th.User.Id, post2.Id, "test in the present", "test in the present", "jpg", "image/jpeg", creationDate2, 0)
+	p2, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "test in the present", "test in the present", "jpg", "image/jpeg", creationDate2, 0)
 	require.NoError(t, err)
 	creationDate3 := model.GetMillisForTime(time.Date(2020, 03, 21, 23, 59, 59, 0, time.UTC))
-	p3, err := th.createFileInfo(th.User.Id, post1.Id, "test in the present", "test in the present", "jpg", "image/jpeg", creationDate3, 0)
+	p3, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "test in the present", "test in the present", "jpg", "image/jpeg", creationDate3, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -830,13 +830,13 @@ func testFileInfoFilterFilesBeforeSpecificDate(t *testing.T, th *SearchTestHelpe
 	defer th.deleteUserPosts(th.User.Id)
 
 	creationDate := model.GetMillisForTime(time.Date(2020, 03, 01, 12, 0, 0, 0, time.UTC))
-	p1, err := th.createFileInfo(th.User.Id, post1.Id, "test in specific date", "test in specific date", "jpg", "image/jpeg", creationDate, 0)
+	p1, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "test in specific date", "test in specific date", "jpg", "image/jpeg", creationDate, 0)
 	require.NoError(t, err)
 	creationDate2 := model.GetMillisForTime(time.Date(2020, 03, 22, 23, 59, 59, 0, time.UTC))
-	p2, err := th.createFileInfo(th.User.Id, post2.Id, "test in specific date 2", "test in specific date 2", "jpg", "image/jpeg", creationDate2, 0)
+	p2, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "test in specific date 2", "test in specific date 2", "jpg", "image/jpeg", creationDate2, 0)
 	require.NoError(t, err)
 	creationDate3 := model.GetMillisForTime(time.Date(2020, 03, 26, 16, 55, 0, 0, time.UTC))
-	p3, err := th.createFileInfo(th.User.Id, post1.Id, "test in the present", "test in the present", "jpg", "image/jpeg", creationDate3, 0)
+	p3, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "test in the present", "test in the present", "jpg", "image/jpeg", creationDate3, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -874,13 +874,13 @@ func testFileInfoFilterFilesAfterSpecificDate(t *testing.T, th *SearchTestHelper
 	defer th.deleteUserPosts(th.User.Id)
 
 	creationDate := model.GetMillisForTime(time.Date(2020, 03, 01, 12, 0, 0, 0, time.UTC))
-	p1, err := th.createFileInfo(th.User.Id, post1.Id, "test in specific date", "test in specific date", "jpg", "image/jpeg", creationDate, 0)
+	p1, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "test in specific date", "test in specific date", "jpg", "image/jpeg", creationDate, 0)
 	require.NoError(t, err)
 	creationDate2 := model.GetMillisForTime(time.Date(2020, 03, 22, 23, 59, 59, 0, time.UTC))
-	p2, err := th.createFileInfo(th.User.Id, post2.Id, "test in specific date 2", "test in specific date 2", "jpg", "image/jpeg", creationDate2, 0)
+	p2, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "test in specific date 2", "test in specific date 2", "jpg", "image/jpeg", creationDate2, 0)
 	require.NoError(t, err)
 	creationDate3 := model.GetMillisForTime(time.Date(2020, 03, 26, 16, 55, 0, 0, time.UTC))
-	p3, err := th.createFileInfo(th.User.Id, post1.Id, "test in the present", "test in the present", "jpg", "image/jpeg", creationDate3, 0)
+	p3, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "test in the present", "test in the present", "jpg", "image/jpeg", creationDate3, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -917,11 +917,11 @@ func testFileInfoFilterFilesWithATerm(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post1.Id, "one two three", "one two three", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "one two three", "one two three", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post2.Id, "one four five six", "one four five six", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "one four five six", "one four five six", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post1.Id, "one seven eight nine", "one seven eight nine", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "one seven eight nine", "one seven eight nine", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -956,11 +956,11 @@ func testFileInfoSearchUsingBooleanOperators(t *testing.T, th *SearchTestHelper)
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "one two three message", "one two three message", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "one two three message", "one two three message", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post.Id, "two messages", "two messages", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "two messages", "two messages", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "another message", "another message", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "another message", "another message", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -998,13 +998,13 @@ func testFileInfoSearchUsingCombinedFilters(t *testing.T, th *SearchTestHelper)
 	defer th.deleteUserPosts(th.User.Id)
 
 	creationDate := model.GetMillisForTime(time.Date(2020, 03, 01, 12, 0, 0, 0, time.UTC))
-	p1, err := th.createFileInfo(th.User.Id, post2.Id, "one two three message", "one two three message", "jpg", "image/jpeg", creationDate, 0)
+	p1, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "one two three message", "one two three message", "jpg", "image/jpeg", creationDate, 0)
 	require.NoError(t, err)
 	creationDate2 := model.GetMillisForTime(time.Date(2020, 03, 10, 12, 0, 0, 0, time.UTC))
-	p2, err := th.createFileInfo(th.User2.Id, post2.Id, "two messages", "two messages", "jpg", "image/jpeg", creationDate2, 0)
+	p2, err := th.createFileInfo(th.User2.Id, post2.Id, post2.ChannelId, "two messages", "two messages", "jpg", "image/jpeg", creationDate2, 0)
 	require.NoError(t, err)
 	creationDate3 := model.GetMillisForTime(time.Date(2020, 03, 20, 12, 0, 0, 0, time.UTC))
-	p3, err := th.createFileInfo(th.User.Id, post1.Id, "two another message", "two another message", "jpg", "image/jpeg", creationDate3, 0)
+	p3, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "two another message", "two another message", "jpg", "image/jpeg", creationDate3, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 	defer th.deleteUserFileInfos(th.User2.Id)
@@ -1067,13 +1067,13 @@ func testFileInfoSearchIgnoringStopWords(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "the search for a bunch of stop words", "the search for a bunch of stop words", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "the search for a bunch of stop words", "the search for a bunch of stop words", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post.Id, "the objective is to avoid a bunch of stop words", "the objective is to avoid a bunch of stop words", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "the objective is to avoid a bunch of stop words", "the objective is to avoid a bunch of stop words", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p3, err := th.createFileInfo(th.User.Id, post.Id, "in the a on to where you", "in the a on to where you", "jpg", "image/jpeg", 0, 0)
+	p3, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "in the a on to where you", "in the a on to where you", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p4, err := th.createFileInfo(th.User.Id, post.Id, "where is the car?", "where is the car?", "jpg", "image/jpeg", 0, 0)
+	p4, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "where is the car?", "where is the car?", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1129,11 +1129,11 @@ func testFileInfoSupportStemming(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "search post", "search post", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "search post", "search post", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post.Id, "searching post", "searching post", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "searching post", "searching post", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "another post", "another post", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "another post", "another post", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1153,11 +1153,11 @@ func testFileInfoSupportWildcards(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "search post", "search post", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "search post", "search post", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post.Id, "searching", "searching", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "searching", "searching", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "another post", "another post", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "another post", "another post", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1190,11 +1190,11 @@ func testFileInfoNotSupportPrecedingWildcards(t *testing.T, th *SearchTestHelper
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	_, err = th.createFileInfo(th.User.Id, post.Id, "search post", "search post", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "search post", "search post", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "searching post", "searching post", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "searching post", "searching post", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "another post", "another post", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "another post", "another post", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1212,9 +1212,9 @@ func testFileInfoSearchDiscardWildcardAlone(t *testing.T, th *SearchTestHelper)
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "qwerty", "qwerty", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "qwerty", "qwerty", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "qwertyjkl", "qwertyjkl", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "qwertyjkl", "qwertyjkl", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1233,9 +1233,9 @@ func testFileInfoSupportTermsWithDash(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "search term-with-dash", "search term-with-dash", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "search term-with-dash", "search term-with-dash", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "searching term with dash", "searching term with dash", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "searching term with dash", "searching term with dash", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1267,9 +1267,9 @@ func testFileInfoSupportTermsWithUnderscore(t *testing.T, th *SearchTestHelper)
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "search term_with_underscore", "search term_with_underscore", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "search term_with_underscore", "search term_with_underscore", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "searching term with underscore", "searching term with underscore", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "searching term with underscore", "searching term with underscore", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1307,11 +1307,11 @@ func testFileInfoSearchInDeletedOrArchivedChannels(t *testing.T, th *SearchTestH
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post1.Id, "message in deleted channel", "message in deleted channel", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "message in deleted channel", "message in deleted channel", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post2.Id, "message in regular channel", "message in regular channel", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "message in regular channel", "message in regular channel", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p3, err := th.createFileInfo(th.User.Id, post3.Id, "message in private channel", "message in private channel", "jpg", "image/jpeg", 0, 0)
+	p3, err := th.createFileInfo(th.User.Id, post3.Id, post3.ChannelId, "message in private channel", "message in private channel", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1382,9 +1382,9 @@ func testFileInfoSearchTermsWithDashes(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "message with-dash-term", "message with-dash-term", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "message with-dash-term", "message with-dash-term", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post.Id, "message with dash term", "message with dash term", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "message with dash term", "message with dash term", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1431,9 +1431,9 @@ func testFileInfoSearchTermsWithDots(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "message with.dots.term", "message with.dots.term", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "message with.dots.term", "message with.dots.term", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post.Id, "message with dots term", "message with dots term", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "message with dots term", "message with dots term", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1480,9 +1480,9 @@ func testFileInfoSearchTermsWithUnderscores(t *testing.T, th *SearchTestHelper)
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "message with_underscores_term", "message with_underscores_term", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "message with_underscores_term", "message with_underscores_term", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post.Id, "message with underscores term", "message with underscores term", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "message with underscores term", "message with underscores term", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1532,11 +1532,11 @@ func testFileInfoSupportStemmingAndWildcards(t *testing.T, th *SearchTestHelper)
 	require.NoError(t, err)
 
 	defer th.deleteUserPosts(th.User.Id)
-	p1, err := th.createFileInfo(th.User.Id, post1.Id, "approve", "approve", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "approve", "approve", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post2.Id, "approved", "approved", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "approved", "approved", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p3, err := th.createFileInfo(th.User.Id, post2.Id, "approvedz", "approvedz", "jpg", "image/jpeg", 0, 0)
+	p3, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "approvedz", "approvedz", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1568,9 +1568,9 @@ func testFileInfoSupportWildcardOutsideQuotes(t *testing.T, th *SearchTestHelper
 	post2, err := th.createPost(th.User.Id, th.ChannelPrivate.Id, "testmessage", "", model.PostTypeDefault, 0, false)
 	require.NoError(t, err)
 
-	p1, err := th.createFileInfo(th.User.Id, post1.Id, "hello world", "hello world", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post1.Id, post1.ChannelId, "hello world", "hello world", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	p2, err := th.createFileInfo(th.User.Id, post2.Id, "hell or heaven", "hell or heaven", "jpg", "image/jpeg", 0, 0)
+	p2, err := th.createFileInfo(th.User.Id, post2.Id, post2.ChannelId, "hell or heaven", "hell or heaven", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1600,7 +1600,7 @@ func testFileInfoSlashShouldNotBeCharSeparator(t *testing.T, th *SearchTestHelpe
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "alpha/beta gamma, theta", "alpha/beta gamma, theta", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "alpha/beta gamma, theta", "alpha/beta gamma, theta", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 
@@ -1631,9 +1631,9 @@ func testFileInfoSearchEmailsWithoutQuotes(t *testing.T, th *SearchTestHelper) {
 	require.NoError(t, err)
 	defer th.deleteUserPosts(th.User.Id)
 
-	p1, err := th.createFileInfo(th.User.Id, post.Id, "message test@test.com", "message test@test.com", "jpg", "image/jpeg", 0, 0)
+	p1, err := th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "message test@test.com", "message test@test.com", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
-	_, err = th.createFileInfo(th.User.Id, post.Id, "message test2@test.com", "message test2@test.com", "jpg", "image/jpeg", 0, 0)
+	_, err = th.createFileInfo(th.User.Id, post.Id, post.ChannelId, "message test2@test.com", "message test2@test.com", "jpg", "image/jpeg", 0, 0)
 	require.NoError(t, err)
 	defer th.deleteUserFileInfos(th.User.Id)
 

server/channels/store/searchtest/helper.go

@@ -371,10 +371,11 @@ func (th *SearchTestHelper) createPost(userID, channelID, message, hashtags, pos
 	return th.Store.Post().Save(postModel)
 }
 
-func (th *SearchTestHelper) createFileInfoModel(creatorID, postID, name, content, extension, mimeType string, createAt, size int64) *model.FileInfo {
+func (th *SearchTestHelper) createFileInfoModel(creatorID, postID, channelID, name, content, extension, mimeType string, createAt, size int64) *model.FileInfo {
 	return &model.FileInfo{
 		CreatorId: creatorID,
 		PostId:    postID,
+		ChannelId: channelID,
 		CreateAt:  createAt,
 		UpdateAt:  createAt,
 		DeleteAt:  0,
@@ -387,12 +388,12 @@ func (th *SearchTestHelper) createFileInfoModel(creatorID, postID, name, content
 	}
 }
 
-func (th *SearchTestHelper) createFileInfo(creatorID, postID, name, content, extension, mimeType string, createAt, size int64) (*model.FileInfo, error) {
+func (th *SearchTestHelper) createFileInfo(creatorID, postID, channelID, name, content, extension, mimeType string, createAt, size int64) (*model.FileInfo, error) {
 	var creationTime int64 = 1000000
 	if createAt > 0 {
 		creationTime = createAt
 	}
-	fileInfoModel := th.createFileInfoModel(creatorID, postID, name, content, extension, mimeType, creationTime, size)
+	fileInfoModel := th.createFileInfoModel(creatorID, postID, channelID, name, content, extension, mimeType, creationTime, size)
 	return th.Store.FileInfo().Save(fileInfoModel)
 }
 

server/channels/store/sqlstore/channel_store.go

@@ -2265,7 +2265,7 @@ func (s SqlChannelStore) GetFileCount(channelId string) (int64, error) {
 		    FileInfo
 		WHERE
 		    FileInfo.DeleteAt = 0
-            AND FileInfo.PostId IN (SELECT id FROM Posts WHERE ChannelId = ?)`,
+            AND FileInfo.ChannelId = ?`,
 		channelId)
 	if err != nil {
 		return 0, errors.Wrapf(err, "failed to count files with channelId=%s", channelId)

server/channels/store/sqlstore/file_info_store.go

@@ -88,6 +88,7 @@ func newSqlFileInfoStore(sqlStore *SqlStore, metrics einterfaces.MetricsInterfac
 		"FileInfo.Id",
 		"FileInfo.CreatorId",
 		"FileInfo.PostId",
+		"COALESCE(FileInfo.ChannelId, '') AS ChannelId",
 		"FileInfo.CreateAt",
 		"FileInfo.UpdateAt",
 		"FileInfo.DeleteAt",
@@ -118,10 +119,10 @@ func (fs SqlFileInfoStore) Save(info *model.FileInfo) (*model.FileInfo, error) {
 
 	query := `
 		INSERT INTO FileInfo
-		(Id, CreatorId, PostId, CreateAt, UpdateAt, DeleteAt, Path, ThumbnailPath, PreviewPath,
+		(Id, CreatorId, PostId, ChannelId, CreateAt, UpdateAt, DeleteAt, Path, ThumbnailPath, PreviewPath,
 			Name, Extension, Size, MimeType, Width, Height, HasPreviewImage, MiniPreview, Content, RemoteId)
 		VALUES
-		(:Id, :CreatorId, :PostId, :CreateAt, :UpdateAt, :DeleteAt, :Path, :ThumbnailPath, :PreviewPath,
+		(:Id, :CreatorId, :PostId, :ChannelId, :CreateAt, :UpdateAt, :DeleteAt, :Path, :ThumbnailPath, :PreviewPath,
 			:Name, :Extension, :Size, :MimeType, :Width, :Height, :HasPreviewImage, :MiniPreview, :Content, :RemoteId)
 	`
 
@@ -133,9 +134,8 @@ func (fs SqlFileInfoStore) Save(info *model.FileInfo) (*model.FileInfo, error) {
 
 func (fs SqlFileInfoStore) GetByIds(ids []string) ([]*model.FileInfo, error) {
 	query := fs.getQueryBuilder().
-		Select(append(fs.queryFields, "COALESCE(P.ChannelId, '') as ChannelId")...).
+		Select(fs.queryFields...).
 		From("FileInfo").
-		LeftJoin("Posts as P ON FileInfo.PostId=P.Id").
 		Where(sq.Eq{"FileInfo.Id": ids}).
 		Where(sq.Eq{"FileInfo.DeleteAt": 0}).
 		OrderBy("FileInfo.CreateAt DESC")
@@ -166,6 +166,8 @@ func (fs SqlFileInfoStore) Upsert(info *model.FileInfo) (*model.FileInfo, error)
 		return nil, err
 	}
 
+	// PostID and ChannelID are deliberately ignored
+	// from the list of fields to keep those two immutable.
 	queryString, args, err := fs.getQueryBuilder().
 		Update("FileInfo").
 		SetMap(map[string]any{
@@ -261,8 +263,7 @@ func (fs SqlFileInfoStore) GetWithOptions(page, perPage int, opt *model.GetFileI
 		From("FileInfo")
 
 	if len(opt.ChannelIds) > 0 {
-		query = query.Join("Posts ON FileInfo.PostId = Posts.Id").
-			Where(sq.Eq{"Posts.ChannelId": opt.ChannelIds})
+		query = query.Where(sq.Eq{"FileInfo.ChannelId": opt.ChannelIds})
 	}
 
 	if len(opt.UserIds) > 0 {
@@ -388,10 +389,11 @@ func (fs SqlFileInfoStore) GetForUser(userId string) ([]*model.FileInfo, error)
 	return infos, nil
 }
 
-func (fs SqlFileInfoStore) AttachToPost(fileId, postId, creatorId string) error {
+func (fs SqlFileInfoStore) AttachToPost(fileId, postId, channelId, creatorId string) error {
 	query := fs.getQueryBuilder().
 		Update("FileInfo").
 		Set("PostId", postId).
+		Set("ChannelId", channelId).
 		Where(sq.And{
 			sq.Eq{"Id": fileId},
 			sq.Eq{"PostId": ""},
@@ -506,10 +508,9 @@ func (fs SqlFileInfoStore) Search(paramsList []*model.SearchParams, userId, team
 		return nil, err
 	}
 	query := fs.getQueryBuilder().
-		Select(append(fs.queryFields, "Coalesce(P.ChannelId, '') AS ChannelId")...).
+		Select(fs.queryFields...).
 		From("FileInfo").
-		LeftJoin("Posts as P ON FileInfo.PostId=P.Id").
-		LeftJoin("Channels as C ON C.Id=P.ChannelId").
+		LeftJoin("Channels as C ON C.Id=FileInfo.ChannelId").
 		LeftJoin("ChannelMembers as CM ON C.Id=CM.ChannelId").
 		Where(sq.Eq{"FileInfo.DeleteAt": 0}).
 		OrderBy("FileInfo.CreateAt DESC").
@@ -715,9 +716,8 @@ func (fs SqlFileInfoStore) CountAll() (int64, error) {
 func (fs SqlFileInfoStore) GetFilesBatchForIndexing(startTime int64, startFileID string, limit int) ([]*model.FileForIndexing, error) {
 	files := []*model.FileForIndexing{}
 	sql, args, _ := fs.getQueryBuilder().
-		Select(append(fs.queryFields, "Coalesce(p.ChannelId, '') AS ChannelId")...).
+		Select(fs.queryFields...).
 		From("FileInfo").
-		LeftJoin("Posts AS p ON FileInfo.PostId = p.Id").
 		Where(sq.Or{
 			sq.Gt{"FileInfo.CreateAt": startTime},
 			sq.And{

server/channels/store/sqlstore/integrity.go

@@ -134,6 +134,15 @@ func checkChannelsPostsIntegrity(ss *SqlStore) model.IntegrityCheckResult {
 	})
 }
 
+func checkChannelsFileInfoIntegrity(ss *SqlStore) model.IntegrityCheckResult {
+	return checkParentChildIntegrity(ss, relationalCheckConfig{
+		parentName:   "Channels",
+		parentIdAttr: "ChannelId",
+		childName:    "FileInfo",
+		childIdAttr:  "Id",
+	})
+}
+
 func checkCommandsCommandWebhooksIntegrity(ss *SqlStore) model.IntegrityCheckResult {
 	return checkParentChildIntegrity(ss, relationalCheckConfig{
 		parentName:   "Commands",
@@ -458,6 +467,7 @@ func checkChannelsIntegrity(ss *SqlStore, results chan<- model.IntegrityCheckRes
 	results <- checkChannelsIncomingWebhooksIntegrity(ss)
 	results <- checkChannelsOutgoingWebhooksIntegrity(ss)
 	results <- checkChannelsPostsIntegrity(ss)
+	results <- checkChannelsFileInfoIntegrity(ss)
 }
 
 func checkCommandsIntegrity(ss *SqlStore, results chan<- model.IntegrityCheckResult) {

server/channels/store/sqlstore/integrity_test.go

@@ -115,7 +115,7 @@ func createEmoji(ss store.Store, userId string) *model.Emoji {
 	return emoji
 }
 
-func createFileInfo(ss store.Store, postId, userId string) *model.FileInfo {
+func createFileInfo(ss store.Store, postId, channelId, userId string) *model.FileInfo {
 	m := model.FileInfo{}
 	m.PostId = postId
 	m.CreatorId = userId
@@ -623,7 +623,7 @@ func TestCheckPostsFileInfoIntegrity(t *testing.T) {
 
 		t.Run("should generate a report with one record", func(t *testing.T) {
 			postId := model.NewId()
-			info := createFileInfo(ss, postId, model.NewId())
+			info := createFileInfo(ss, postId, model.NewId(), model.NewId())
 			result := checkPostsFileInfoIntegrity(store)
 			require.NoError(t, result.Err)
 			data := result.Data.(model.RelationalIntegrityCheckData)
@@ -1226,7 +1226,7 @@ func TestCheckUsersFileInfoIntegrity(t *testing.T) {
 		t.Run("should generate a report with one record", func(t *testing.T) {
 			user := createUser(ss)
 			userId := user.Id
-			info := createFileInfo(ss, model.NewId(), userId)
+			info := createFileInfo(ss, model.NewId(), model.NewId(), userId)
 			dbmap.Exec(`DELETE FROM Users WHERE Id=?`, user.Id)
 			result := checkUsersFileInfoIntegrity(store)
 			require.NoError(t, result.Err)

server/channels/store/store.go

@@ -699,7 +699,7 @@ type FileInfoStore interface {
 	GetForUser(userID string) ([]*model.FileInfo, error)
 	GetWithOptions(page, perPage int, opt *model.GetFileInfosOptions) ([]*model.FileInfo, error)
 	InvalidateFileInfosForPostCache(postID string, deleted bool)
-	AttachToPost(fileID string, postID string, creatorID string) error
+	AttachToPost(fileID string, postID string, channelID, creatorID string) error
 	DeleteForPost(postID string) (string, error)
 	PermanentDelete(fileID string) error
 	PermanentDeleteBatch(endTime int64, limit int64) (int64, error)

server/channels/store/storetest/file_info_store.go

@@ -106,26 +106,31 @@ func testFileInfoSaveGetByPath(t *testing.T, ss store.Store) {
 func testFileInfoGetForPost(t *testing.T, ss store.Store) {
 	userId := model.NewId()
 	postId := model.NewId()
+	channelId := model.NewId()
 
 	infos := []*model.FileInfo{
 		{
 			PostId:    postId,
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 		},
 		{
 			PostId:    postId,
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 		},
 		{
 			PostId:    postId,
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 			DeleteAt:  123,
 		},
 		{
 			PostId:    model.NewId(),
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 		},
@@ -225,25 +230,30 @@ func testFileInfoGetForUser(t *testing.T, ss store.Store) {
 	userId := model.NewId()
 	userId2 := model.NewId()
 	postId := model.NewId()
+	channelId := model.NewId()
 
 	infos := []*model.FileInfo{
 		{
 			PostId:    postId,
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 		},
 		{
 			PostId:    postId,
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 		},
 		{
 			PostId:    postId,
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 		},
 		{
 			PostId:    model.NewId(),
+			ChannelId: channelId,
 			CreatorId: userId2,
 			Path:      "file.txt",
 		},
@@ -289,6 +299,9 @@ func testFileInfoGetWithOptions(t *testing.T, ss store.Store) {
 		if post.Id != "" {
 			fileInfo.PostId = post.Id
 		}
+		if post.ChannelId != "" {
+			fileInfo.ChannelId = post.ChannelId
+		}
 		_, err := ss.FileInfo().Save(&fileInfo)
 		require.NoError(t, err)
 		return fileInfo
@@ -414,6 +427,7 @@ func testFileInfoAttachToPost(t *testing.T, ss store.Store) {
 	t.Run("should attach files", func(t *testing.T) {
 		userId := model.NewId()
 		postId := model.NewId()
+		channelId := model.NewId()
 
 		info1, err := ss.FileInfo().Save(&model.FileInfo{
 			CreatorId: userId,
@@ -429,13 +443,15 @@ func testFileInfoAttachToPost(t *testing.T, ss store.Store) {
 		require.Equal(t, "", info1.PostId)
 		require.Equal(t, "", info2.PostId)
 
-		err = ss.FileInfo().AttachToPost(info1.Id, postId, userId)
+		err = ss.FileInfo().AttachToPost(info1.Id, postId, channelId, userId)
 		assert.NoError(t, err)
 		info1.PostId = postId
+		info1.ChannelId = channelId
 
-		err = ss.FileInfo().AttachToPost(info2.Id, postId, userId)
+		err = ss.FileInfo().AttachToPost(info2.Id, postId, channelId, userId)
 		assert.NoError(t, err)
 		info2.PostId = postId
+		info2.ChannelId = channelId
 
 		data, err := ss.FileInfo().GetForPost(postId, true, false, false)
 		require.NoError(t, err)
@@ -449,6 +465,7 @@ func testFileInfoAttachToPost(t *testing.T, ss store.Store) {
 	t.Run("should not attach files to multiple posts", func(t *testing.T) {
 		userId := model.NewId()
 		postId := model.NewId()
+		channelId := model.NewId()
 
 		info, err := ss.FileInfo().Save(&model.FileInfo{
 			CreatorId: userId,
@@ -458,16 +475,17 @@ func testFileInfoAttachToPost(t *testing.T, ss store.Store) {
 
 		require.Equal(t, "", info.PostId)
 
-		err = ss.FileInfo().AttachToPost(info.Id, model.NewId(), userId)
+		err = ss.FileInfo().AttachToPost(info.Id, model.NewId(), channelId, userId)
 		require.NoError(t, err)
 
-		err = ss.FileInfo().AttachToPost(info.Id, postId, userId)
+		err = ss.FileInfo().AttachToPost(info.Id, postId, channelId, userId)
 		require.Error(t, err)
 	})
 
 	t.Run("should not attach files owned from a different user", func(t *testing.T) {
 		userId := model.NewId()
 		postId := model.NewId()
+		channelId := model.NewId()
 
 		info, err := ss.FileInfo().Save(&model.FileInfo{
 			CreatorId: model.NewId(),
@@ -477,12 +495,13 @@ func testFileInfoAttachToPost(t *testing.T, ss store.Store) {
 
 		require.Equal(t, "", info.PostId)
 
-		err = ss.FileInfo().AttachToPost(info.Id, postId, userId)
+		err = ss.FileInfo().AttachToPost(info.Id, postId, channelId, userId)
 		assert.Error(t, err)
 	})
 
 	t.Run("should attach files uploaded by nouser", func(t *testing.T) {
 		postId := model.NewId()
+		channelId := model.NewId()
 
 		info, err := ss.FileInfo().Save(&model.FileInfo{
 			CreatorId: "nouser",
@@ -491,12 +510,13 @@ func testFileInfoAttachToPost(t *testing.T, ss store.Store) {
 		require.NoError(t, err)
 		assert.Equal(t, "", info.PostId)
 
-		err = ss.FileInfo().AttachToPost(info.Id, postId, model.NewId())
+		err = ss.FileInfo().AttachToPost(info.Id, postId, channelId, model.NewId())
 		require.NoError(t, err)
 
 		data, err := ss.FileInfo().GetForPost(postId, true, false, false)
 		require.NoError(t, err)
 		info.PostId = postId
+		info.ChannelId = channelId
 		assert.EqualValues(t, []*model.FileInfo{info}, data)
 	})
 }
@@ -504,26 +524,31 @@ func testFileInfoAttachToPost(t *testing.T, ss store.Store) {
 func testFileInfoDeleteForPost(t *testing.T, ss store.Store) {
 	userId := model.NewId()
 	postId := model.NewId()
+	channelId := model.NewId()
 
 	infos := []*model.FileInfo{
 		{
 			PostId:    postId,
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 		},
 		{
 			PostId:    postId,
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 		},
 		{
 			PostId:    postId,
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 			DeleteAt:  123,
 		},
 		{
 			PostId:    model.NewId(),
+			ChannelId: channelId,
 			CreatorId: userId,
 			Path:      "file.txt",
 		},
@@ -549,6 +574,7 @@ func testFileInfoDeleteForPost(t *testing.T, ss store.Store) {
 func testFileInfoPermanentDelete(t *testing.T, ss store.Store) {
 	info, err := ss.FileInfo().Save(&model.FileInfo{
 		PostId:    model.NewId(),
+		ChannelId: model.NewId(),
 		CreatorId: model.NewId(),
 		Path:      "file.txt",
 	})
@@ -560,9 +586,11 @@ func testFileInfoPermanentDelete(t *testing.T, ss store.Store) {
 
 func testFileInfoPermanentDeleteBatch(t *testing.T, ss store.Store) {
 	postId := model.NewId()
+	channelId := model.NewId()
 
 	_, err := ss.FileInfo().Save(&model.FileInfo{
 		PostId:    postId,
+		ChannelId: channelId,
 		CreatorId: model.NewId(),
 		Path:      "file.txt",
 		CreateAt:  1000,
@@ -571,6 +599,7 @@ func testFileInfoPermanentDeleteBatch(t *testing.T, ss store.Store) {
 
 	_, err = ss.FileInfo().Save(&model.FileInfo{
 		PostId:    postId,
+		ChannelId: channelId,
 		CreatorId: model.NewId(),
 		Path:      "file.txt",
 		CreateAt:  1200,
@@ -579,6 +608,7 @@ func testFileInfoPermanentDeleteBatch(t *testing.T, ss store.Store) {
 
 	_, err = ss.FileInfo().Save(&model.FileInfo{
 		PostId:    postId,
+		ChannelId: channelId,
 		CreatorId: model.NewId(),
 		Path:      "file.txt",
 		CreateAt:  2000,
@@ -600,9 +630,11 @@ func testFileInfoPermanentDeleteBatch(t *testing.T, ss store.Store) {
 func testFileInfoPermanentDeleteByUser(t *testing.T, ss store.Store) {
 	userId := model.NewId()
 	postId := model.NewId()
+	channelId := model.NewId()
 
 	_, err := ss.FileInfo().Save(&model.FileInfo{
 		PostId:    postId,
+		ChannelId: channelId,
 		CreatorId: userId,
 		Path:      "file.txt",
 	})
@@ -668,6 +700,7 @@ func testFileInfoStoreGetFilesBatchForIndexing(t *testing.T, ss store.Store) {
 	require.NoError(t, err)
 	f1, err := ss.FileInfo().Save(&model.FileInfo{
 		PostId:    o1.Id,
+		ChannelId: o1.ChannelId,
 		CreatorId: model.NewId(),
 		Path:      "file1.txt",
 	})
@@ -686,6 +719,7 @@ func testFileInfoStoreGetFilesBatchForIndexing(t *testing.T, ss store.Store) {
 
 	f2, err := ss.FileInfo().Save(&model.FileInfo{
 		PostId:    o2.Id,
+		ChannelId: o2.ChannelId,
 		CreatorId: model.NewId(),
 		Path:      "file2.txt",
 	})
@@ -705,6 +739,7 @@ func testFileInfoStoreGetFilesBatchForIndexing(t *testing.T, ss store.Store) {
 
 	f3, err := ss.FileInfo().Save(&model.FileInfo{
 		PostId:    o3.Id,
+		ChannelId: o3.ChannelId,
 		CreatorId: model.NewId(),
 		Path:      "file3.txt",
 	})
@@ -737,6 +772,7 @@ func testFileInfoStoreCountAll(t *testing.T, ss store.Store) {
 	require.NoError(t, err)
 	f1, err := ss.FileInfo().Save(&model.FileInfo{
 		PostId:    model.NewId(),
+		ChannelId: model.NewId(),
 		CreatorId: model.NewId(),
 		Path:      "file1.txt",
 	})
@@ -744,12 +780,14 @@ func testFileInfoStoreCountAll(t *testing.T, ss store.Store) {
 
 	_, err = ss.FileInfo().Save(&model.FileInfo{
 		PostId:    model.NewId(),
+		ChannelId: model.NewId(),
 		CreatorId: model.NewId(),
 		Path:      "file2.txt",
 	})
 	require.NoError(t, err)
 	_, err = ss.FileInfo().Save(&model.FileInfo{
 		PostId:    model.NewId(),
+		ChannelId: model.NewId(),
 		CreatorId: model.NewId(),
 		Path:      "file3.txt",
 	})

server/channels/store/storetest/mocks/FileInfoStore.go

@@ -14,13 +14,13 @@ type FileInfoStore struct {
 	mock.Mock
 }
 
-// AttachToPost provides a mock function with given fields: fileID, postID, creatorID
-func (_m *FileInfoStore) AttachToPost(fileID string, postID string, creatorID string) error {
-	ret := _m.Called(fileID, postID, creatorID)
+// AttachToPost provides a mock function with given fields: fileID, postID, channelID, creatorID
+func (_m *FileInfoStore) AttachToPost(fileID string, postID string, channelID string, creatorID string) error {
+	ret := _m.Called(fileID, postID, channelID, creatorID)
 
 	var r0 error
-	if rf, ok := ret.Get(0).(func(string, string, string) error); ok {
-		r0 = rf(fileID, postID, creatorID)
+	if rf, ok := ret.Get(0).(func(string, string, string, string) error); ok {
+		r0 = rf(fileID, postID, channelID, creatorID)
 	} else {
 		r0 = ret.Error(0)
 	}

server/channels/store/timerlayer/timerlayer.go

@@ -3182,10 +3182,10 @@ func (s *TimerLayerEmojiStore) Search(name string, prefixOnly bool, limit int) (
 	return result, err
 }
 
-func (s *TimerLayerFileInfoStore) AttachToPost(fileID string, postID string, creatorID string) error {
+func (s *TimerLayerFileInfoStore) AttachToPost(fileID string, postID string, channelID string, creatorID string) error {
 	start := time.Now()
 
-	err := s.FileInfoStore.AttachToPost(fileID, postID, creatorID)
+	err := s.FileInfoStore.AttachToPost(fileID, postID, channelID, creatorID)
 
 	elapsed := float64(time.Since(start)) / float64(time.Second)
 	if s.Root.Metrics != nil {

server/platform/services/slackimport/slackimport.go

@@ -680,7 +680,7 @@ func (si *SlackImporter) oldImportPost(post *model.Post) string {
 				firstPostId = post.Id
 			}
 			for _, fileId := range post.FileIds {
-				if err := si.store.FileInfo().AttachToPost(fileId, post.Id, post.UserId); err != nil {
+				if err := si.store.FileInfo().AttachToPost(fileId, post.Id, post.ChannelId, post.UserId); err != nil {
 					mlog.Error(
 						"Error attaching files to post.",
 						mlog.String("post_id", post.Id),