1 files changed, 1 insertions, 5 deletions
diff --git a/activerecord/test/models/topic.rb b/activerecord/test/models/topic.rb
index 75890c327a..77101090f2 100644
--- a/activerecord/test/models/topic.rb
+++ b/activerecord/test/models/topic.rb
@@ -99,7 +99,7 @@ class Topic < ActiveRecord::Base
     end
 
     def destroy_children
-      self.class.where("parent_id = #{id}").delete_all
+      self.class.delete_by(parent_id: id)
     end
 
     def set_email_address
@@ -119,10 +119,6 @@ class Topic < ActiveRecord::Base
     end
 end
 
-class ImportantTopic < Topic
-  serialize :important, Hash
-end
-
 class DefaultRejectedTopic < Topic
   default_scope -> { where(approved: false) }
 end