ActiveModel::Validations

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.to_s[0] == ?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                   # => #<OrderedHash {: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.

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Active Model Acceptance Validator

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Active Model Presence Validator

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Active Model Exclusion Validator

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Active Model Format Validator

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Active Model validates method

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Active Model Inclusion Validator

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Active Model Length Validator

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Active Model Numericality Validator

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Active Model Confirmation Validator