Fixed use of equals (closes #2109)

cookbook/security/custom_provider.rst

@@ -22,17 +22,26 @@ create a ``User`` class that represents that data. The ``User`` can look
 however you want and contain any data. The only requirement is that the
 class implements :class:`Symfony\\Component\\Security\\Core\\User\\UserInterface`.
 The methods in this interface should therefore be defined in the custom user
-class: ``getRoles()``, ``getPassword()``, ``getSalt()``, ``getUsername()``,
-``eraseCredentials()``, ``equals()``.
+class: :method:`Symfony\\Component\\Security\\Core\\User\\UserInterface::getRoles`,
+:method`Symfony\\Component\\Security\\Core\\User\\UserInterfacegetPassword`,
+:method:`Symfony\\Component\\Security\\Core\\User\\UserInterface::getSalt`,
+:method:`Symfony\\Component\\Security\\Core\\User\\UserInterface::getUsername`,
+:method:`Symfony\\Component\\Security\\Core\\User\\UserInterface::eraseCredentials`.
+It is also usefull to implement the 
+:class:`Symfony\\Component\\Security\\Core\\User\\EquatableInterface` interface,
+to define a method how check if the user is equal to the current user. This
+interface requires a :method:`Symfony\\Component\\Security\\Core\\User\\EquatableInterface::isEqualTo`
+method.
 
 Let's see this in action::
 
     // src/Acme/WebserviceUserBundle/Security/User/WebserviceUser.php
     namespace Acme\WebserviceUserBundle\Security\User;
 
     use Symfony\Component\Security\Core\User\UserInterface;
+    use Symfony\Component\Security\Core\User\EquatableInterface;
 
-    class WebserviceUser implements UserInterface
+    class WebserviceUser implements UserInterface, EquatableInterface
     {
         private $username;
         private $password;
@@ -71,7 +80,7 @@ Let's see this in action::
         {
         }
 
-        public function equals(UserInterface $user)
+        public function isEqualTo(UserInterface $user)
         {
             if (!$user instanceof WebserviceUser) {
                 return false;
@@ -93,11 +102,13 @@ Let's see this in action::
         }
     }
 
+.. versionadded:: 2.1
+    The ``EquatableInterface`` was added in Symfony 2.1, use the ``equals()``
+    method of the ``UserInterface`` in Symfony 2.0
+
 If you have more information about your users - like a "first name" - then
 you can add a ``firstName`` field to hold that data.
 
-For more details on each of the methods, see :class:`Symfony\\Component\\Security\\Core\\User\\UserInterface`.
-
 Create a User Provider
 ----------------------