[deploy] Remove orphaned polls related rows (#9855)

lib/data_update_scripts/20200818170410_remove_orphaned_poll_votes.rb

@@ -0,0 +1,29 @@
+module DataUpdateScripts
+  class RemoveOrphanedPollVotes
+    def run
+      # Delete all PollVotes belonging to Polls that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM poll_votes
+          WHERE poll_id NOT IN (SELECT id FROM polls);
+        SQL
+      )
+
+      # Delete all PollVotes belonging to PollOptions that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM poll_votes
+          WHERE poll_option_id NOT IN (SELECT id FROM poll_options);
+        SQL
+      )
+
+      # Delete all PollVotes belonging to Users that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM poll_votes
+          WHERE user_id NOT IN (SELECT id FROM users);
+        SQL
+      )
+    end
+  end
+end

lib/data_update_scripts/20200818170433_remove_orphaned_poll_skips.rb

@@ -0,0 +1,21 @@
+module DataUpdateScripts
+  class RemoveOrphanedPollSkips
+    def run
+      # Delete all PollSkips belonging to Polls that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM poll_skips
+          WHERE poll_id NOT IN (SELECT id FROM polls);
+        SQL
+      )
+
+      # Delete all PollSkips belonging to Users that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM poll_skips
+          WHERE user_id NOT IN (SELECT id FROM users);
+        SQL
+      )
+    end
+  end
+end

lib/data_update_scripts/20200818170505_remove_orphaned_poll_options.rb

@@ -0,0 +1,21 @@
+module DataUpdateScripts
+  class RemoveOrphanedPollOptions
+    def run
+      # Delete all PollOptions belonging to Polls that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM poll_options
+          WHERE poll_id NOT IN (SELECT id FROM polls);
+        SQL
+      )
+
+      # Delete all PollOptions belonging to Polls that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM poll_options
+          WHERE poll_id NOT IN (SELECT id FROM polls);
+        SQL
+      )
+    end
+  end
+end

lib/data_update_scripts/20200818170523_remove_orphaned_polls.rb

@@ -0,0 +1,13 @@
+module DataUpdateScripts
+  class RemoveOrphanedPolls
+    def run
+      # Delete all Polls belonging to Articles that don't exist anymore
+      ActiveRecord::Base.connection.execute(
+        <<~SQL,
+          DELETE FROM polls
+          WHERE article_id NOT IN (SELECT id FROM articles);
+        SQL
+      )
+    end
+  end
+end