Ruby Rails : How to bypass skip validation in Devise

Hallelujah — Wed, 20 Oct 2010 16:25:34 +0000

Since my last post with email validations, I was looking for a solution to integrate it with devise

Sadly for me, devise implements the old way of validating email with regexp :

# From devise gem version 1.1.3
validates_format_of     :email, :with  => email_regexp, :allow_blank => true

Well, as I don’t want to hack activemodel’s code, I prefer to skip the validates_format_of method in User class.

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable, :lockable and :timeoutable
  include SkipableMethod
 
  # Devise is great but uses the oldest way with regexp to validate email
  skip_and_restore_method(:validates_format_of) do
    devise :database_authenticatable, :registerable,
      :recoverable, :rememberable, :trackable, :validatable
  end
 
  # Replace with a validation of my own
  validates :email, :email => true, :presence => true
 
  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation, :remember_me
 
end

And then the library :

module SkipableMethod
  module ClassMethods
 
    protected
    def __skip_method(*args);end
 
    def skip_and_restore_method(*method_names,&block)
      method_names.each do |method_name|
        instance_eval <<-EVAL
        alias #{method_name}_skipped #{method_name}
        alias #{method_name} __skip_method
        EVAL
      end
 
      yield
 
      method_names.each do |method_name|
        instance_eval <<-EVAL
        alias #{method_name} #{method_name}_skipped
        undef #{method_name}_skipped
        EVAL
      end
    end
  end
 
  def self.included(receiver)
    receiver.extend         ClassMethods
  end
end

TODO :

Some tests

Email validation in Ruby On Rails 3 or Active model without regexp

Hallelujah — Wed, 21 Jul 2010 08:21:42 +0000

In Rails 3.0, you can use custom validator in your active_record model.
So I wanted to manage email validations without regexp matching like others do.
I find a new way to make this work thanks to ruby mail gem, a dependency of Rails 3.0

I use this with devise, see my blogpost here : Ruby Rails : How to bypass skip validation in Devise

Edit : Here is a gem https://github.com/hallelujah/valid_email

class User < ActiveRecord::Base
  validates :email, :presence => true, :email => true
end

Just put a file in app/validators/email_validator.rb

require 'mail'
class EmailValidator < ActiveModel::EachValidator
  def validate_each(record,attribute,value)
    begin
      m = Mail::Address.new(value)
      # We must check that value contains a domain and that value is an email address
      r = m.domain && m.address == value
      t = m.__send__(:tree)
      # We need to dig into treetop
      # A valid domain must have dot_atom_text elements size > 1
      # user@localhost is excluded
      # treetop must respond to domain
      # We exclude valid email values like 
      # Hence we use m.__send__(tree).domain
      r &&= (t.domain.dot_atom_text.elements.size > 1)
    rescue Exception => e   
      r = false
    end
    record.errors[attribute] << (options[:message] || "is invalid") unless r
  end
end

No regexp !! And beautiful !!

Here is the version without activerecord

require 'rubygems'
require 'active_model'
require 'active_support/all'
require 'active_model/validations'
require 'mail'
class EmailValidator < ActiveModel::EachValidator
  def validate_each(record,attribute,value)
    begin
      m = Mail::Address.new(value)
      # We must check that value contains a domain and that value is an email address
      r = m.domain && m.address == value
      t = m.__send__(:tree)
      # We need to dig into treetop
      # A valid domain must have dot_atom_text elements size > 1
      # user@localhost is excluded
      # treetop must respond to domain
      # We exclude valid email values like 
      # Hence we use m.__send__(tree).domain
      r &&= (t.domain.dot_atom_text.elements.size > 1)
    rescue Exception => e
      r = false
    end
    record.errors[attribute] << (options[:message] || "is invalid") unless r
  end
end
 
class Person
  include ActiveModel::Validations
  attr_accessor :name, :email
 
  validates :name, :presence => true, :length => { :maximum => 100 }
  validates :email, :presence => true, :email => true
end

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Ruby Rails : How to bypass skip validation in Devise

Email validation in Ruby On Rails 3 or Active model without regexp