instance method `validates_absence_of`

Ruby on Rails 6.1.7.10

Since v4.0.13

Available in: v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

validates_absence_of(*attr_names)

Validates that the specified attributes are blank (as defined by Object#present?). 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:

:message - A custom error message (default is: “must be blank”).

There is also a list of default options supported by every validator: :if, :unless, :on, :allow_nil, :allow_blank, and :strict. See ActiveModel::Validations#validates for more information

Parameters

attr_names rest

Source

# File activemodel/lib/active_model/validations/absence.rb, line 28
      def validates_absence_of(*attr_names)
        validates_with AbsenceValidator, _merge_attributes(attr_names)
      end

Defined in activemodel/lib/active_model/validations/absence.rb line 28 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveModel::Validations::HelperMethods

Signature

Parameters