From 23d225b372406bd575b82f7b8bdcfc2b4b8160ea Mon Sep 17 00:00:00 2001
From: Jerin Peter George <jerinpetergeorge@gmail.com>
Date: Wed, 15 Jul 2020 11:05:19 +0530
Subject: [PATCH] 'PrimaryKeySerializerField' introduced

---
 rest_framework/relations.py   | 12 ++++++++++++
 rest_framework/serializers.py |  3 ++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/rest_framework/relations.py b/rest_framework/relations.py
index 3a2a8fb4b..d85639d08 100644
--- a/rest_framework/relations.py
+++ b/rest_framework/relations.py
@@ -265,6 +265,18 @@ class PrimaryKeyRelatedField(RelatedField):
         return value.pk
 
 
+class PrimaryKeySerializerField(PrimaryKeyRelatedField):
+    def __init__(self, serializer, **kwargs):
+        self.serializer = serializer
+        super().__init__(**kwargs)
+
+    def use_pk_only_optimization(self):
+        return False
+
+    def to_representation(self, instance):
+        return self.serializer(instance, context=self.context).data
+
+
 class HyperlinkedRelatedField(RelatedField):
     lookup_field = 'pk'
     view_name = None
diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 916f8bec4..6501c9955 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -57,7 +57,8 @@ from rest_framework.fields import (  # NOQA # isort:skip
 )
 from rest_framework.relations import (  # NOQA # isort:skip
     HyperlinkedIdentityField, HyperlinkedRelatedField, ManyRelatedField,
-    PrimaryKeyRelatedField, RelatedField, SlugRelatedField, StringRelatedField,
+    PrimaryKeyRelatedField, PrimaryKeySerializerField, RelatedField, SlugRelatedField,
+    StringRelatedField,
 )
 
 # Non-field imports, but public API