ActiveModel::Validations::HelperMethods

module ActiveModel::Validations::HelperMethods

Public Instance Methods

validates_absence_of(*attr_names) Show source

Validates that the specified attributes are blank (as defined by Object#blank?). Happens by default on save.

class Person < ActiveRecord::Base
  validates_absence_of :first_name
end

The first_name attribute must be in the object and it must be blank.

Configuration options