DEV: Minor fixes to b63b399799.

app/models/category.rb

@@ -3,6 +3,10 @@
 require_dependency 'distributed_cache'
 
 class Category < ActiveRecord::Base
+  self.ignored_columns = %w{
+    uploaded_meta_id
+  }
+
   include Searchable
   include Positionable
   include HasCustomFields

db/post_migrate/20190103065652_remove_uploaded_meta_id_from_category.rb

@@ -1,3 +1,5 @@
+require 'migration/column_dropper'
+
 class RemoveUploadedMetaIdFromCategory < ActiveRecord::Migration[5.2]
   def up
     Migration::ColumnDropper.execute_drop(:categories, %i{uploaded_meta_id})