Type:
Module
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.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.