demo_app/my_platform/db/migrate/20150325105867_fix_column_names_for_bookmarks.your_platform.rb
# This migration comes from your_platform (originally 20130310004622)
class FixColumnNamesForBookmarks < ActiveRecord::Migration[4.2]
def change
rename_column :bookmarks, :starrable_id, :bookmarkable_id
rename_column :bookmarks, :starrable_type, :bookmarkable_type
end
end