Module | DataMapper::Validations::ValidatesAbsence |
In: |
lib/dm-validations/validators/absent_field_validator.rb
|
Validates that the specified attribute is "blank" via the attribute‘s blank? method.
@note
dm-core's support lib adds the #blank? method to many classes,
@see lib/dm-core/support/blank.rb (dm-core) for more information.
@example [Usage]
require 'dm-validations' class Page include DataMapper::Resource property :unwanted_attribute, String property :another_unwanted, String property :yet_again, String validates_absence_of :unwanted_attribute validates_absence_of :another_unwanted, :yet_again # a call to valid? will return false unless # all three attributes are blank end