instance method `before_validation`

Ruby on Rails 7.2.3

Since v3.0.20

Available in: v3.0.20 v3.1.12 v3.2.22.5 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:

before_validation(*args, &block)

Defines a callback that will get called right before validation.

class Person
  include ActiveModel::Validations
  include ActiveModel::Validations::Callbacks

  attr_accessor :name

  validates_length_of :name, maximum: 6

  before_validation :remove_whitespaces

  private
    def remove_whitespaces
      name.strip!
    end
end

person = Person.new
person.name = '  bob  '
person.valid? # => true
person.name   # => "bob"

Parameters

args rest
block block

Source

# File activemodel/lib/active_model/validations/callbacks.rb, line 55
        def before_validation(*args, &block)
          options = args.extract_options!

          set_options_for_callback(options)

          set_callback(:validation, :before, *args, options, &block)
        end

Defined in activemodel/lib/active_model/validations/callbacks.rb line 55 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveModel::Validations::Callbacks::ClassMethods

Signature

Parameters