From 9feda929409ab687befaed8d1c9878d94e955adc Mon Sep 17 00:00:00 2001 From: Brent Wheeldon & Nick Monje Date: Fri, 22 Jun 2012 12:09:48 -0400 Subject: AR has a subclass of AM:PresenceValidator. This allows us to mark the parent object as invalid if all associated objects in a presence validated association are marked for destruction. See: https://github.com/rails/rails/issues/6812 --- guides/source/active_record_validations_callbacks.textile | 2 ++ 1 file changed, 2 insertions(+) (limited to 'guides/source') diff --git a/guides/source/active_record_validations_callbacks.textile b/guides/source/active_record_validations_callbacks.textile index f49d91fd3c..da3a96d84e 100644 --- a/guides/source/active_record_validations_callbacks.textile +++ b/guides/source/active_record_validations_callbacks.textile @@ -373,6 +373,8 @@ class LineItem < ActiveRecord::Base end +If you validate the presence of an object associated via a +has_one+ or +has_many+ relationship, it will check that the object is neither +blank?+ nor +marked_for_destruction?+. + Since +false.blank?+ is true, if you want to validate the presence of a boolean field you should use validates :field_name, :inclusion => { :in => [true, false] }. The default error message is "_can't be empty_". -- cgit v1.2.3