diff options
Diffstat (limited to 'railties/doc/guides/source')
| -rw-r--r-- | railties/doc/guides/source/activerecord_validations_callbacks.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/railties/doc/guides/source/activerecord_validations_callbacks.txt b/railties/doc/guides/source/activerecord_validations_callbacks.txt index 9865aeebb0..7d37df1ed2 100644 --- a/railties/doc/guides/source/activerecord_validations_callbacks.txt +++ b/railties/doc/guides/source/activerecord_validations_callbacks.txt @@ -317,6 +317,20 @@ class Coffee < ActiveRecord::Base end ------------------------------------------------------------------ +=== The +:allow_blank+ option + +In compliment to +:allow_nil+ we have +:allow_blank+. This option will let validation pass if the attribute's value is +nil+ or an empty string, i.e., any value that returns +true+ for +blank?+. + +[source, ruby] +------------------------------------------------------------------ +class Topic < ActiveRecord::Base + validates_length_of :title, :is => 5, :allow_blank => true +end + +Topic.create("title" => "").valid? # => true +Topic.create("title" => nil).valid? # => true +------------------------------------------------------------------ + === The +:message+ option As stated before, the +:message+ option lets you specify the message that will be added to the +errors+ collection when validation fails. When this option is not used, Active Record will use the respective default error message for each validation helper. |