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| author | Brent Wheeldon & Nick Monje <pair+brent+nmonje@pivotallabs.com> | 2012-06-22 12:09:48 -0400 |
|---|---|---|
| committer | Ben Moss <pair+bmoss@pivotallabs.com> | 2012-07-20 17:37:57 -0400 |
| commit | 9feda929409ab687befaed8d1c9878d94e955adc (patch) | |
| tree | 5deafb5e134315050c59e059a71d18ec6915e655 /guides | |
| parent | 215d41d802637520129cb7551b35faca72873143 (diff) | |
| download | rails-9feda929409ab687befaed8d1c9878d94e955adc.tar.gz rails-9feda929409ab687befaed8d1c9878d94e955adc.tar.bz2 rails-9feda929409ab687befaed8d1c9878d94e955adc.zip | |
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
Diffstat (limited to 'guides')
| -rw-r--r-- | guides/source/active_record_validations_callbacks.textile | 2 |
1 files changed, 2 insertions, 0 deletions
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 </ruby> +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 <tt>validates :field_name, :inclusion => { :in => [true, false] }</tt>. The default error message is "_can't be empty_". |