[Form] fixed EntityType choice options

Author: HeahDude

reference/forms/types/entity.rst

@@ -17,15 +17,15 @@ objects from the database.
 |             | - `em`_                                                          |
 |             | - `query_builder`_                                               |
 +-------------+------------------------------------------------------------------+
-| Overridden  | - `choices`_                                                     |
-| options     | - `data_class`_                                                  |
+| Overridden  | - `choice_name`_                                                 |
+| options     | - `choice_value`_                                                |
+|             | - `choices`_                                                     |
+|             | - `data_class`_                                                  |
 +-------------+------------------------------------------------------------------+
 | Inherited   | from the :doc:`choice </reference/forms/types/choice>` type:     |
 | options     |                                                                  |
 |             | - `choice_attr`_                                                 |
-|             | - `choice_name`_                                                 |
 |             | - `choice_translation_domain`_                                   |
-|             | - `choice_value`_                                                |
 |             | - `expanded`_                                                    |
 |             | - `group_by`_                                                    |
 |             | - `multiple`_                                                    |
@@ -115,7 +115,7 @@ choice_label
     The ``choice_label`` option was introduced in Symfony 2.7. Prior to Symfony
     2.7, it was called ``property`` (which has the same functionality).
 
-**type**: ``string`` or ``callable``
+**type**: ``string``, ``callable`` or :class:``Symfony\\Component\\PropertyAccess\\PropertyPath``
 
 This is the property that should be used for displaying the entities as text in
 the HTML element::
@@ -183,6 +183,32 @@ the entity and return an instance of ``QueryBuilder``.
 Overridden Options
 ------------------
 
+choice_name
+~~~~~~~~~~~
+
+.. versionadded:: 2.7
+    The ``choice_name`` option was introduced in Symfony 2.7.
+
+**type**: ``string``, ``callable`` or :class:``Symfony\\Component\\PropertyAccess\\PropertyPath`` **default**: id
+
+By default the name of each field will be the id of the entity, if it can be
+get in the class metadata by an internal id reader.
+
+choice_value
+~~~~~~~~~~~~
+
+.. versionadded:: 2.7
+    The ``choice_value`` option was introduced in Symfony 2.7.
+
+**type**: ``string``, ``callable`` or :class:``Symfony\\Component\\PropertyAccess\\PropertyPath`` **default**: id
+
+As for the ``choice_name`` option, ``choice_value`` use the id by default.
+It allows an optimization in the :class:``Symfony\\Bridge\\Doctrine\\Form\\ChoiceList\\Loader\\DoctrineChoiceLoader`` which will
+only load the ids passed as values while the form submission, preventing the all class,
+or even the custom ``query_builder`` to be called.
+Even if it can be usefull for API to use an entity property as string value,
+you will gain performances by letting this option set by default.
+
 choices
 ~~~~~~~
 
@@ -208,12 +234,8 @@ type:
 
 .. include:: /reference/forms/types/options/choice_attr.rst.inc
 
-.. include:: /reference/forms/types/options/choice_name.rst.inc
-
 .. include:: /reference/forms/types/options/choice_translation_domain.rst.inc
 
-.. include:: /reference/forms/types/options/choice_value.rst.inc
-
 .. include:: /reference/forms/types/options/expanded.rst.inc
 
 .. include:: /reference/forms/types/options/group_by.rst.inc