Removed obsolete import_string call for related serializers

Author: sliverc

rest_framework_json_api/schemas/openapi.py

@@ -1,7 +1,6 @@
 import warnings
 from urllib.parse import urljoin
 
-from django.utils.module_loading import import_string as import_class_from_dotted_path
 from rest_framework.fields import empty
 from rest_framework.relations import ManyRelatedField
 from rest_framework.schemas import openapi as drf_openapi
@@ -379,13 +378,7 @@ def _find_related_view(self, view_endpoints, related_serializer, parent_view):
         """
         for path, method, view in view_endpoints:
             view_serializer = view.get_serializer()
-            if not isinstance(related_serializer, type):
-                related_serializer_class = import_class_from_dotted_path(
-                    related_serializer
-                )
-            else:
-                related_serializer_class = related_serializer
-            if isinstance(view_serializer, related_serializer_class):
+            if isinstance(view_serializer, related_serializer):
                 return view
 
         return None

rest_framework_json_api/views.py

@@ -11,7 +11,6 @@
 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.fields import get_attribute
@@ -183,8 +182,6 @@ def get_related_serializer_class(self):
                     False
                 ), 'Either "included_serializers" or "related_serializers" should be configured'
 
-            if not isinstance(_class, type):
-                return import_class_from_dotted_path(_class)
             return _class
 
         return parent_serializer_class