Add post_edit_time_limit site setting to limit the how long a post can be edited and deleted by the author. Default is 1 year.

app/assets/javascripts/discourse/controllers/topic_controller.js

@@ -459,7 +459,17 @@ Discourse.TopicController = Discourse.ObjectController.extend(Discourse.Selected
         }
       ]);
     } else {
-      post.destroy(user);
+      post.destroy(user).then(null, function(e) {
+        console.log('Error case?');
+        console.log(e);
+        post.undoDeleteState();
+        var response = $.parseJSON(e.responseText);
+        if (response && response.errors) {
+          bootbox.alert(response.errors[0]);
+        } else {
+          bootbox.alert(I18n.t('generic_error'));
+        }
+      });
     }
   },
 

app/assets/javascripts/discourse/models/post.js

@@ -153,6 +153,7 @@ Discourse.Post = Discourse.Model.extend({
       // We're updating a post
       return Discourse.ajax("/posts/" + (this.get('id')), {
         type: 'PUT',
+        dataType: 'json',
         data: {
           post: { raw: this.get('raw'), edit_reason: this.get('editReason') },
           image_sizes: this.get('imageSizes')
@@ -236,6 +237,8 @@ Discourse.Post = Discourse.Model.extend({
     @param {Discourse.User} deletedBy The user deleting the post
   **/
   setDeletedState: function(deletedBy) {
+    this.set('oldCooked', this.get('cooked'));
+
     // Moderators can delete posts. Regular users can only trigger a deleted at message.
     if (deletedBy.get('staff')) {
       this.setProperties({
@@ -255,6 +258,26 @@ Discourse.Post = Discourse.Model.extend({
     }
   },
 
+  /**
+    Changes the state of the post to NOT be deleted. Does not call the server.
+    This can only be called after setDeletedState was called, but the delete
+    failed on the server.
+
+    @method undoDeletedState
+  **/
+  undoDeleteState: function() {
+    if (this.get('oldCooked')) {
+      this.setProperties({
+        deleted_at: null,
+        deleted_by: null,
+        cooked: this.get('oldCooked'),
+        version: this.get('version') - 1,
+        can_recover: false,
+        user_deleted: false
+      });
+    }
+  },
+
   /**
     Deletes a post