ValidateEmail

This gem adds the capability of validating email addresses to ActiveModel. The gem only supports Rails 3 (has dependencies in ActiveModel and ActiveSupport 3.0)

# add this to your Gemfile
gem "validate_email"

# and then run
rake gems:install

# or just run
sudo gem install validate_email

class Pony < ActiveRecord::Base
  # standard validation
  validates :email_address, :email => true

  # with allow_nil
  validates :email_address, :email => {:allow_nil => true}

  # with allow_blank
  validates :email_address, :email => {:allow_blank => true}
end

class Unicorn
  include ActiveModel::Validations

  attr_accessor :email_address

  # with legacy syntax (the syntax above works also)
  validates_email :email_address, :allow_blank => true
end

The error message will be looked up according to the standard ActiveModel::Errors scheme. For the above Unicorn class this would be:

• activemodel.errors.models.unicorn.attributes.email_address.email
• activemodel.errors.models.unicorn.email
• activemodel.errors.messages.email
• errors.attributes.email_address.email
• errors.messages.email

A default errors.messages.email of is not a valid email address is provided. You can also pass the :message => "my custom error" option to your validation to define your own custom message.

Tanel Suurhans (http://twitter.com/tanelsuurhans)
Tarmo Lehtpuu (http://twitter.com/tarmolehtpuu)

Copyright 2010 by PerfectLine LLC (http://www.perfectline.co.uk) and is released under the MIT license.