ActiveRecord::Validator vs ActiveModel::Validator

rubyonrails-talk
1

I know that there is an ActiveModel Validator class

https://github.com/rails/rails/blob/master/activemodel/lib/active_model/validator.rb

which is used for the class level validation macros.

But I didn't find a an ActiveRecord Validator class.

ActiveModel to leave ActiveRecord as an ORM.

So now I see this Rails 3 code in a Rails 3 book and get confused:

Class EmailValidator < ActiveRecord::Validator   def validate()     email_field = options[:attr]     record.errors[email_field] << “is not valid” unless record.send(email_field) =~ /^[a-z]$/   end end

class Account < ActiveRecord::Base   validates_with EmailValidator, :attr => :email end

Where is this ActiveRecord::Validator coming from? Also why does it exist when you can simply do this in ActiveModel:

class RandomlyValidator < ActiveModel::Validator   def validate(record)     record.errors[:base] << “FAIL #1” unless first_hurdle(record) #add error messages to the whole object instead of a particular attribute using the :base key.     record.errors[:base] << “Fail #2” unless second_hurdle(record)     record.errors[:base] << “Fail #3” unless third_hurdle(record)   end

  private

  def first_hurdle(record)     rand > 0.3   end

  def second_hurdle(record)     rand > 0.6   end

  def third_hurdle(record)     rand > 0.9   end end

class Report < ActiveRecord::Base   validates_with RandomlyValidator end

thanks for response