Use json str, normalize keys

src/documents/serialisers.py

@@ -1758,6 +1758,8 @@ class PostDocumentSerializer(serializers.Serializer):
                         "value": value,
                     },
                 )
+            # Normalize keys to integers for later
+            return {int(k): v for k, v in custom_fields_w_values.items()}
 
     def validate_created(self, created):
         # support datetime format for created for backwards compatibility

src/documents/tests/test_api_documents.py

@@ -1,4 +1,5 @@
 import datetime
+import json
 import shutil
 import tempfile
 import uuid
@@ -1551,7 +1552,10 @@ class TestDocumentApi(DirectoriesMixin, DocumentConsumeDelayMixin, APITestCase):
         with (Path(__file__).parent / "samples" / "simple.pdf").open("rb") as f:
             response = self.client.post(
                 "/api/documents/post_document/",
-                {"document": f, "custom_fields_w_values": {"3456": "a string"}},
+                {
+                    "document": f,
+                    "custom_fields_w_values": json.dumps({"3456": "a string"}),
+                },
             )
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.consume_file_mock.assert_not_called()
@@ -1571,10 +1575,12 @@ class TestDocumentApi(DirectoriesMixin, DocumentConsumeDelayMixin, APITestCase):
                 "/api/documents/post_document/",
                 {
                     "document": f,
-                    "custom_fields_w_values": {
-                        str(cf_string.id): "a string",
-                        str(cf_int.id): 123,
-                    },
+                    "custom_fields_w_values": json.dumps(
+                        {
+                            str(cf_string.id): "a string",
+                            str(cf_int.id): 123,
+                        },
+                    ),
                 },
             )