feature #5051 Rename CollectionType entry options (WouterJ)

This PR was submitted for the 2.7 branch but it was merged into the 2.8 branch instead (closes #5051).

Discussion
----------

Rename CollectionType entry options

| Q | A
| --- | ---
| Doc fix? | no
| New docs? | yes (symfony/symfony#15025)
| Applies to | 2.7+
| Fixed tickets | -

Commits
-------

1b00278 Rename CollectionType entry options

cookbook/form/form_collections.rst

@@ -126,7 +126,7 @@ Notice that you embed a collection of ``TagType`` forms using the
         {
             $builder->add('description');
 
-            $builder->add('tags', 'collection', array('type' => new TagType()));
+            $builder->add('tags', 'collection', array('entry_type' => new TagType()));
         }
 
         public function configureOptions(OptionsResolver $resolver)
@@ -285,7 +285,7 @@ add the ``allow_add`` option to your collection field::
         $builder->add('description');
 
         $builder->add('tags', 'collection', array(
-            'type'         => new TagType(),
+            'entry_type'   => new TagType(),
             'allow_add'    => true,
         ));
     }

reference/forms/types/collection.rst

@@ -17,10 +17,10 @@ photos).
 | Options     | - `allow_add`_                                                              |
 |             | - `allow_delete`_                                                           |
 |             | - `delete_empty`_                                                           |
-|             | - `options`_                                                                |
+|             | - `entry_options`_                                                          |
+|             | - `entry_type`_                                                             |
 |             | - `prototype`_                                                              |
 |             | - `prototype_name`_                                                         |
-|             | - `type`_                                                                   |
 +-------------+-----------------------------------------------------------------------------+
 | Inherited   | - `by_reference`_                                                           |
 | options     | - `cascade_validation`_                                                     |
@@ -53,10 +53,10 @@ to an array of email addresses. In the form, you want to expose each email
 address as its own input text box::
 
     $builder->add('emails', 'collection', array(
-        // each item in the array will be an "email" field
-        'type'   => 'email',
+        // each entry in the array will be an "email" field
+        'entry_type'   => 'email',
         // these options are passed to each "email" type
-        'options'  => array(
+        'entry_options'  => array(
             'required'  => false,
             'attr'      => array('class' => 'email-box')
         ),
@@ -273,20 +273,24 @@ form you have to set this option to true. However, existing collection entries
 will only be deleted if you have the allow_delete_ option enabled. Otherwise
 the empty values will be kept.
 
-options
-~~~~~~~
+entry_options
+~~~~~~~~~~~~~
+
+.. versionadded:: 2.7
+    The ``entry_options`` option was introduced in Symfony 2.7 in favor of
+    ``options``, which is available prior to 2.7.
 
 **type**: ``array`` **default**: ``array()``
 
-This is the array that's passed to the form type specified in the `type`_
+This is the array that's passed to the form type specified in the `entry_type`_
 option. For example, if you used the :doc:`choice </reference/forms/types/choice>`
-type as your `type`_ option (e.g. for a collection of drop-down menus),
+type as your `entry_type`_ option (e.g. for a collection of drop-down menus),
 then you'd need to at least pass the ``choices`` option to the underlying
 type::
 
     $builder->add('favorite_cities', 'collection', array(
-        'type'   => 'choice',
-        'options'  => array(
+        'entry_type'   => 'choice',
+        'entry_options'  => array(
             'choices'  => array(
                 'nashville' => 'Nashville',
                 'paris'     => 'Paris',
@@ -296,6 +300,21 @@ type::
         ),
     ));
 
+entry_type
+~~~~~~~~~~
+
+.. versionadded:: 2.7
+    The ``entry_type`` option was introduced in Symfony 2.7 in favor of
+    ``type``, which is available prior to 2.7.
+
+**type**: ``string`` or :class:`Symfony\\Component\\Form\\FormTypeInterface` **required**
+
+This is the field type for each item in this collection (e.g. ``text``,
+``choice``, etc). For example, if you have an array of email addresses,
+you'd use the :doc:`email </reference/forms/types/email>` type. If you want
+to embed a collection of some other form, create a new instance of your
+form type and pass it as this option.
+
 prototype
 ~~~~~~~~~
 
@@ -344,17 +363,6 @@ If you have several collections in your form, or worse, nested collections
 you may want to change the placeholder so that unrelated placeholders are
 not replaced with the same value.
 
-type
-~~~~
-
-**type**: ``string`` or :class:`Symfony\\Component\\Form\\FormTypeInterface` **required**
-
-This is the field type for each item in this collection (e.g. ``text``,
-``choice``, etc). For example, if you have an array of email addresses,
-you'd use the :doc:`email </reference/forms/types/email>` type. If you want
-to embed a collection of some other form, create a new instance of your
-form type and pass it as this option.
-
 Inherited Options
 -----------------