Added docs for IdenticalTo validator

Author: wouterj

reference/constraints.rst

@@ -23,6 +23,7 @@ Validation Constraints Reference
 
    constraints/EqualTo
    constraints/NotEqualTo
+   constraints/IdenticalTo
 
    constraints/Date
    constraints/DateTime

reference/constraints/IdenticalTo.rst

@@ -0,0 +1,101 @@
+IdenticalTo
+===========
+
+.. versionadded:: 2.3
+    This constraint is new in version 2.3.
+
+Validates that a value is identical to another value, defined in the options.
+To force that a value is *not* equal, see
+:doc:`/reference/constraints/NotIdenticalTo`.
+
+.. caution::
+    
+    This constraint compares using ``===``, so ``3`` and ``"3"`` are *not*
+    considered equal. Use :doc:`/reference/constraints/EqualTo` to compare
+    with ``==``.
+
++----------------+--------------------------------------------------------------------------+
+| Applies to     | :ref:`property or method<validation-property-target>`                    |
++----------------+--------------------------------------------------------------------------+
+| Options        | - `value`_                                                               |
+|                | - `message`_                                                             |
++----------------+--------------------------------------------------------------------------+
+| Class          | :class:`Symfony\\Component\\Validator\\Constraints\\IdenticalTo`         |
++----------------+--------------------------------------------------------------------------+
+| Validator      | :class:`Symfony\\Component\\Validator\\Constraints\\IdenticalToValidator`|
++----------------+--------------------------------------------------------------------------+
+
+Basic Usage
+-----------
+
+If you want to ensure that the ``age`` of a ``Person`` class is equal to
+``20`` and an integer, you could do the following:
+
+.. configuration-block::
+
+    .. code-block:: yaml
+
+        # src/SocialBundle/Resources/config/validation.yml
+        Acme\SocialBundle\Entity\Person:
+            properties:
+                age:
+                    - IdenticalTo:
+                        value: 20
+
+    .. code-block:: php-annotations
+
+        // src/Acme/SocialBundle/Entity/Person.php
+        namespace Acme\SocialBundle\Entity;
+
+        use Symfony\Component\Validator\Constraints as Assert;
+
+        class Person
+        {
+            /**
+             * @Assert\IdenticalTo(
+             *     value = 20
+             * )
+             */
+            protected $age;
+        }
+
+    .. code-block:: xml
+
+        <!-- src/Acme/SocialBundle/Resources/config/validation.xml -->
+        <class name="Acme\SocialBundle\Entity\Person">
+            <property name="age">
+                <constraint name="IdenticalTo">
+                    <option name="value">20</option>
+                </constraint>
+            </property>
+        </class>
+
+    .. code-block:: php
+
+        // src/Acme/SocialBundle/Entity/Person.php
+        namespace Acme\SocialBundle\Entity;
+
+        use Symfony\Component\Validator\Mapping\ClassMetadata;
+        use Symfony\Component\Validator\Constraints as Assert;
+
+        class Person
+        {
+            public static function loadValidatorMetadata(ClassMetadata $metadata)
+            {
+                $metadata->addPropertyConstraint('age', new Assert\IdenticalTo(array(
+                    'value' => 20,
+                )));
+            }
+        }
+
+Options
+-------
+
+.. include:: /reference/constraints/_comparison-value-option.rst.inc
+
+message
+~~~~~~~
+
+**type**: ``string`` **default**: ``This value should be identical to {{ compared_value_type }} {{ compared_value }}``
+
+This is the message that will be shown if the value is not equal.

reference/constraints/map.rst.inc

@@ -31,6 +31,7 @@ Comparison Constraints
 
 * :doc:`EqualTo </reference/constraints/EqualTo>`
 * :doc:`NotEqualTo </reference/constraints/NotEqualTo>`
+* :doc:`IdenticalTo </reference/constraints/IdenticalTo>`
 
 Date Constraints
 ~~~~~~~~~~~~~~~~