class ReAddOwnerToApplication < ActiveRecord::Migration[5.0] def change add_column :oauth_applications, :owner_id, :integer, null: true add_column :oauth_applications, :owner_type, :string, null: true add_index :oauth_applications, [:owner_id, :owner_type] add_foreign_key :oauth_applications, :users, column: :owner_id, on_delete: :cascade end end