/ Ruby on Rails
/
module

ActiveModel::Validations

rails latest stable

Active Model Validations

Provides a full validation framework to your objects.

A minimal implementation could be:

class Person
  include ActiveModel::Validations

  attr_accessor :first_name, :last_name

  validates_each :first_name, :last_name do |record, attr, value|
    record.errors.add attr, "starts with z." if value.start_with?("z")
  end
end

Which provides you with the full standard validation stack that you know from Active Record:

person = Person.new
person.valid?                   # => true
person.invalid?                 # => false

person.first_name = 'zoolander'
person.valid?                   # => false
person.invalid?                 # => true
person.errors.messages          # => {first_name:["starts with z."]}

Note that +ActiveModel::Validations+ automatically adds an errors method to your instances initialized with a new ActiveModel::Errors object, so there is no need for you to do this manually.

Included modules

  • ActiveModel::Validations::HelperMethods

Files

  • activemodel/lib/active_model/validations.rb
  • activemodel/lib/active_model/validations/absence.rb
  • activemodel/lib/active_model/validations/acceptance.rb
  • activemodel/lib/active_model/validations/callbacks.rb
  • activemodel/lib/active_model/validations/clusivity.rb
  • activemodel/lib/active_model/validations/comparability.rb
  • activemodel/lib/active_model/validations/comparison.rb
  • activemodel/lib/active_model/validations/confirmation.rb
  • activemodel/lib/active_model/validations/exclusion.rb
  • activemodel/lib/active_model/validations/format.rb
  • activemodel/lib/active_model/validations/helper_methods.rb
  • activemodel/lib/active_model/validations/inclusion.rb
  • activemodel/lib/active_model/validations/length.rb
  • activemodel/lib/active_model/validations/numericality.rb
  • activemodel/lib/active_model/validations/presence.rb
  • activemodel/lib/active_model/validations/resolve_value.rb
  • activemodel/lib/active_model/validations/validates.rb
  • activemodel/lib/active_model/validations/with.rb

Nested classes and modules