Use dotted path when declaring serializers

Author: Anton-Shutik

example/views.py

@@ -7,11 +7,10 @@
 import rest_framework_json_api.renderers
 from rest_framework_json_api.pagination import PageNumberPagination
 from rest_framework_json_api.utils import format_drf_errors
-from rest_framework_json_api.views import ModelViewSet, RelatedMixin, RelationshipView
+from rest_framework_json_api.views import ModelViewSet, RelationshipView
 
 from example.models import Author, Blog, Comment, Company, Entry, Project
 from example.serializers import (
-    AuthorBioSerializer,
     AuthorSerializer,
     BlogSerializer,
     CommentSerializer,
@@ -93,12 +92,12 @@ class NonPaginatedEntryViewSet(EntryViewSet):
     pagination_class = NoPagination
 
 
-class AuthorViewSet(RelatedMixin, ModelViewSet):
+class AuthorViewSet(ModelViewSet):
     queryset = Author.objects.all()
     serializer_class = AuthorSerializer
     related_serializers = {
-        'bio': AuthorBioSerializer,
-        'entries': EntrySerializer
+        'bio': 'example.serializers.AuthorBioSerializer',
+        'entries': 'example.serializers.EntrySerializer'
     }
 
 

rest_framework_json_api/views.py

@@ -11,6 +11,7 @@
 from django.db.models.manager import Manager
 from django.db.models.query import QuerySet
 from django.urls import NoReverseMatch
+from django.utils.module_loading import import_string as import_class_from_dotted_path
 from rest_framework import generics, viewsets
 from rest_framework.exceptions import MethodNotAllowed, NotFound
 from rest_framework.response import Response
@@ -129,10 +130,10 @@ def retrieve_related(self, request, *args, **kwargs):
     def get_serializer_class(self):
         if 'related_field' in self.kwargs:
             field_name = self.get_related_field_name()
-            _class = self.related_serializers.get(field_name, None)
-            if _class is None:
+            class_str = self.related_serializers.get(field_name, None)
+            if class_str is None:
                 raise NotFound
-            return _class
+            return import_class_from_dotted_path(class_str)
         return super(RelatedMixin, self).get_serializer_class()
 
     def get_related_field_name(self):