From 5e0a91e53b91a2d3930c7269479aa2863c0b5b9d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?K=C3=A9vin=20Dunglas?= <dunglas@gmail.com>
Date: Mon, 10 Sep 2018 17:24:01 +0200
Subject: [PATCH 1/3] [Serializer] Allow to pass a single value for the groups
 opt

---
 components/serializer.rst | 2 +-
 serializer.rst            | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/components/serializer.rst b/components/serializer.rst
index af35afdadc4..10540595da1 100644
--- a/components/serializer.rst
+++ b/components/serializer.rst
@@ -337,7 +337,7 @@ You are now able to serialize only attributes in the groups you want::
     $normalizer = new ObjectNormalizer($classMetadataFactory);
     $serializer = new Serializer(array($normalizer));
 
-    $data = $serializer->normalize($obj, null, array('groups' => array('group1')));
+    $data = $serializer->normalize($obj, null, array('groups' => 'group1'));
     // $data = array('foo' => 'foo');
 
     $obj2 = $serializer->denormalize(
diff --git a/serializer.rst b/serializer.rst
index f8d96782487..43f5cf04ebc 100644
--- a/serializer.rst
+++ b/serializer.rst
@@ -130,9 +130,13 @@ to your class and choose which groups to use when serializing::
 
     $json = $serializer->serialize(
         $someObject,
-        'json', array('groups' => array('group1'))
+        'json', array('groups' => 'group1')
     );
 
+.. note::
+
+    The value of the ``groups`` key can be a single string, or an array of strings.
+
 In addition to the ``@Groups`` annotation, the Serializer component also
 supports YAML or XML files. These files are automatically loaded when being
 stored in one of the following locations:

From e4eae257d14bec7ace8a966e1fe5677da4a24f8a Mon Sep 17 00:00:00 2001
From: Javier Eguiluz <javier.eguiluz@gmail.com>
Date: Tue, 11 Sep 2018 10:12:38 +0200
Subject: [PATCH 2/3] Replaced a "note" by a "tip"

---
 serializer.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/serializer.rst b/serializer.rst
index 43f5cf04ebc..8c0610d3016 100644
--- a/serializer.rst
+++ b/serializer.rst
@@ -133,7 +133,7 @@ to your class and choose which groups to use when serializing::
         'json', array('groups' => 'group1')
     );
 
-.. note::
+.. tip::
 
     The value of the ``groups`` key can be a single string, or an array of strings.
 

From ae558f41df2ef5082a4e15d35b144832f7236346 Mon Sep 17 00:00:00 2001
From: Javier Eguiluz <javier.eguiluz@gmail.com>
Date: Tue, 11 Sep 2018 10:14:42 +0200
Subject: [PATCH 3/3] Added the missing versionadded directive

---
 serializer.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/serializer.rst b/serializer.rst
index 8c0610d3016..25860b6ebf2 100644
--- a/serializer.rst
+++ b/serializer.rst
@@ -136,6 +136,9 @@ to your class and choose which groups to use when serializing::
 .. tip::
 
     The value of the ``groups`` key can be a single string, or an array of strings.
+    
+    .. versionadded:: 4.2
+        The option to pass a single string to ``groups`` was introduced in Symfony 4.2.
 
 In addition to the ``@Groups`` annotation, the Serializer component also
 supports YAML or XML files. These files are automatically loaded when being