Rails 3, Unknown validator: 'EmailValidator

问题:

I try to add an email-validator in my rails app. I created the following file /lib/validators/email_validator.rb

class EmailValidator < ActiveModel::EachValidator
  def validate_each(object, attribute, value)  
    unless value =~ /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i  
      object.errors[attribute] << (options[:message] || "is not formatted properly")  
    end  
  end  
end

In the application.rb I added this line:

config.autoload_paths << "#{config.root}/lib/validators"

And here is my User model:

class User < ActiveRecord::Base
  attr_accessible :email, :password,:name
  validates :email, :presence => true, :uniqueness => true, :email => true  
end

If i want to start the server I got an error:

Unknown validator: 'EmailValidator' (ArgumentError)

Has anybody an idea how I can fix this problem?

回答1:

If you place your custom validators in app/validators they will be automatically loaded without needing to alter your config/application.rb file.

Resource: Where should Rails 3 custom validators be stored? (second answer)

回答2:

This error occures, becouse rails loads model file before your validation file

Try to require your validation file manually at the start of your model file

require_dependency 'validators/email_validator.rb'

回答3:

Try the modified User model;

class User < ActiveRecord::Base

  attr_accessible :email, :password,:name

  validates :email, :presence => true, :uniqueness => true

end