Add relationships support for pointers in errors

Signed-off-by: Mehdy Khoshnoody <mehdy.khoshnoody@gmail.com>

Author: mehdy

rest_framework_json_api/utils.py

@@ -13,7 +13,7 @@
 from django.http import Http404
 from django.utils import encoding
 from django.utils.translation import gettext_lazy as _
-from rest_framework import exceptions
+from rest_framework import exceptions, relations
 from rest_framework.exceptions import APIException
 
 from .settings import json_api_settings
@@ -368,6 +368,23 @@ def get_relation_instance(resource_instance, source, serializer):
     return True, relation_instance
 
 
+def get_serializer_from_context(context):
+    if hasattr(context["view"], "get_serializer"):
+        return context["view"].get_serializer()
+    elif hasattr(context["view"], "get_serializer_class"):
+        return context["view"].get_serializer_class()()
+    elif hasattr(context["view"], "serializer_class"):
+        return context["view"].serializer_class()
+
+
+def get_relationship_fields(fields):
+    return {
+        name: field
+        for name, field in fields.items()
+        if isinstance(field, (relations.RelatedField, relations.ManyRelatedField))
+    }
+
+
 class Hyperlink(str):
     """
     A string like object that additionally has an associated name.
@@ -394,9 +411,14 @@ def format_drf_errors(response, context, exc):
             errors.extend(format_error_object(message, "/data", response))
     # handle all errors thrown from serializers
     else:
+        serializer = get_serializer_from_context(context)
+        fields = get_serializer_fields(serializer) or dict()
+        relationship_fields = get_relationship_fields(fields)
+
         for field, error in response.data.items():
             field = format_field_name(field)
-            pointer = "/data/attributes/{}".format(field)
+            rel = "relationships" if field in relationship_fields else "attributes"
+            pointer = "/data/{}/{}".format(rel, field)
             if isinstance(exc, Http404) and isinstance(error, str):
                 # 404 errors don't have a pointer
                 errors.extend(format_error_object(error, None, response))