instance method `validates_with`

Ruby on Rails 3.1.12

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:

validates_with(*args, &block)

Passes the record off to the class or classes specified and allows them to add errors based on more complex conditions.

class Person
  include ActiveModel::Validations
  validates_with MyValidator
end

class MyValidator < ActiveModel::Validator
  def validate(record)
    if some_complex_logic
      record.errors.add :base, "This record is invalid"
    end
  end

  private
    def some_complex_logic
      # ...
    end
end

You may also pass it multiple classes, like so:

class Person
  include ActiveModel::Validations
  validates_with MyValidator, MyOtherValidator, :on => :create
end

Configuration options:

:on - Specifies when this validation is active (:create or :update
:if - Specifies a method, proc or string to call to determine if the validation should occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The method, proc or string should return or evaluate to a true or false value.
unless - Specifies a method, proc or string to call to determine if the validation should not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }). The method, proc or string should return or evaluate to a true or false value.

If you pass any additional configuration options, they will be passed to the class and available as options:

class Person
  include ActiveModel::Validations
  validates_with MyValidator, :my_custom_key => "my custom value"
end

class MyValidator < ActiveModel::Validator
  def validate(record)
    options[:my_custom_key] # => "my custom value"
  end
end

Parameters

args rest
block block

Source

# File activemodel/lib/active_model/validations/with.rb, line 79
      def validates_with(*args, &block)
        options = args.extract_options!
        args.each do |klass|
          validator = klass.new(options, &block)
          validator.setup(self) if validator.respond_to?(:setup)

          if validator.respond_to?(:attributes) && !validator.attributes.empty?
            validator.attributes.each do |attribute|
              _validators[attribute.to_sym] << validator
            end
          else
            _validators[nil] << validator
          end

          validate(validator, options)
        end
      end

Defined in activemodel/lib/active_model/validations/with.rb line 79 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveModel::Validations::ClassMethods

Signature

Parameters