Gab Social. All are welcome.

db/migrate/20171125031751_add_invite_id_to_users.rb

@@ -0,0 +1,5 @@
+class AddInviteIdToUsers < ActiveRecord::Migration[5.1]
+  def change
+    add_reference :users, :invite, null: true, default: nil, foreign_key: { on_delete: :nullify }, index: false
+  end
+end