Rails plugin that provides a validates_existence_of method for ActiveRecord models to check existence of records referenced by belongs_to associations..



This plugin adds a new validates_existence_of method to ActiveRecord::Base.

The validates_existence_of validator checks that a foreign key in a belongs_to association points to an existing record. If :allow_nil => true, then the key itself may be nil. A non-nil key requires that the foreign object must exist. Works with polymorphic belongs_to.

The default error message is "does not exist".


class Person < ActiveRecord::Base
  belongs_to :address
  validates_existence_of :address

Note that this validation performs a query to see if the record in question exists.

Copyright (c) 2007-2008 Josh Susser. Released under the MIT license.