FEATURE: multiple use invite links (#9813)

db/migrate/20200428102014_add_bulk_invite_link_to_invites.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class AddBulkInviteLinkToInvites < ActiveRecord::Migration[6.0]
+  def change
+    add_column :invites, :max_redemptions_allowed, :integer, null: false, default: 1
+    add_column :invites, :redemption_count, :integer, null: false, default: 0
+    add_column :invites, :expires_at, :datetime, null: true
+
+    invite_expiry_days = DB.query_single("SELECT value FROM site_settings WHERE name = 'invite_expiry_days'").first
+    invite_expiry_days = 30 if invite_expiry_days.blank?
+    execute <<~SQL
+      UPDATE invites SET expires_at = updated_at + INTERVAL '#{invite_expiry_days} days'
+    SQL
+
+    change_column :invites, :expires_at, :datetime, null: false
+  end
+end

db/migrate/20200430072846_create_invited_users.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class CreateInvitedUsers < ActiveRecord::Migration[6.0]
+  def change
+    create_table :invited_users do |t|
+      t.integer :user_id
+      t.integer :invite_id, null: false
+      t.datetime :redeemed_at
+      t.timestamps null: false
+    end
+
+    add_index :invited_users, :invite_id
+    add_index :invited_users, [:user_id, :invite_id], unique: true, where: 'user_id IS NOT NULL'
+  end
+end

db/post_migrate/20200602153813_migrate_invite_redeemed_data_to_invited_users.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class MigrateInviteRedeemedDataToInvitedUsers < ActiveRecord::Migration[6.0]
+  def up
+    %i{user_id redeemed_at}.each do |column|
+      Migration::ColumnDropper.mark_readonly(:invites, column)
+    end
+
+    execute <<~SQL
+      INSERT INTO invited_users (
+        user_id,
+        invite_id,
+        redeemed_at,
+        created_at,
+        updated_at
+      )
+      SELECT user_id, id, redeemed_at, created_at, updated_at
+      FROM invites
+      WHERE user_id IS NOT NULL AND redeemed_at IS NOT NULL
+    SQL
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end