Module: DataMapper::Validations::ValidatesAbsence

Extended by:

Deprecate

Included in:

ClassMethods

Defined in:

lib/dm-validations/validators/absent_field_validator.rb

Overview

class AbsenceValidator

Instance Method Summary

• #validates_absence_of(*fields) ⇒ Object

  Validates that the specified attribute is “blank” via the attribute’s #blank? method.

Instance Method Details

#validates_absence_of(*fields) ⇒ Object

Note:

dm-core’s support lib adds the #blank? method to many classes,

Validates that the specified attribute is “blank” via the attribute’s #blank? method.

Examples:

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

See Also:

• (dm-core) for more information.

# File 'lib/dm-validations/validators/absent_field_validator.rb', line 51

def validates_absence_of(*fields)
  validators.add(AbsenceValidator, *fields)
end