Added missing error message when no resource name is configured on serializer (#1020)

Author: jokiefer

Diff for: AUTHORS

@@ -15,6 +15,7 @@ Jamie Bliss <[email protected]>
 Jason Housley <[email protected]>
 Jeppe Fihl-Pearson <[email protected]>
 Jerel Unruh <[email protected]>
+Jonas Kiefer <https://github.com/jokiefer>
 Jonas Metzener <[email protected]>
 Jonathan Senecal <[email protected]>
 Joseba Mendivil <[email protected]>

Diff for: CHANGELOG.md

@@ -22,6 +22,7 @@ any parts of the framework not mentioned in the documentation should generally b
 * Raise comprehensible error when reserved field names `meta` and `results` are used.
 * Use `relationships` in the error object `pointer` when the field is actually a relationship.
 * Added missing inflection to the generated OpenAPI schema.
+* Added missing error message when `resource_name` is not properly configured.
 
 ### Changed
 

Diff for: rest_framework_json_api/utils.py

@@ -320,7 +320,10 @@ def get_resource_type_from_serializer(serializer):
         return meta.resource_name
     elif hasattr(meta, "model"):
         return get_resource_type_from_model(meta.model)
-    raise AttributeError()
+    raise AttributeError(
+        f"can not detect 'resource_name' on serializer '{serializer.__class__.__name__}'"
+        f" in module '{serializer.__class__.__module__}'"
+    )
 
 
 def get_included_resources(request, serializer=None):

Diff for: tests/test_utils.py

@@ -1,6 +1,7 @@
 import pytest
 from django.db import models
 from rest_framework import status
+from rest_framework.fields import Field
 from rest_framework.generics import GenericAPIView
 from rest_framework.response import Response
 from rest_framework.views import APIView
@@ -15,6 +16,7 @@
     get_included_serializers,
     get_related_resource_type,
     get_resource_name,
+    get_resource_type_from_serializer,
     undo_format_field_name,
     undo_format_field_names,
     undo_format_link_segment,
@@ -377,3 +379,17 @@ class Meta:
     }
 
     assert included_serializers == expected_included_serializers
+
+
+def test_get_resource_type_from_serializer_without_resource_name_raises_error():
+    class SerializerWithoutResourceName(serializers.Serializer):
+        something = Field()
+
+    serializer = SerializerWithoutResourceName()
+
+    with pytest.raises(AttributeError) as excinfo:
+        get_resource_type_from_serializer(serializer=serializer)
+    assert str(excinfo.value) == (
+        "can not detect 'resource_name' on serializer "
+        "'SerializerWithoutResourceName' in module 'tests.test_utils'"
+    )