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Created August 24, 2011 20:10
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Rails email validation
# http://my.rails-royce.org/2010/07/21/email-validation-in-ruby-on-rails-without-regexp/
# lib/email_validator.rb
require 'mail'
module ActiveModel
module Validations
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 <[email protected]>
# 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
end
end
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