fix: update letter update logic to use PUT method and correct user reference

backend/letters/tests.py

@@ -55,13 +55,14 @@ class LetterAPITest(APITestCase):
     def test_create_draft_letter_api(self):
         """Test API can successfully create a basic draft letter."""
         payload = {
+            "public_id": "4281edcc-5459-4ff2-bb5e-669fb44e0757",
             "type": "KEPT",
             "encrypted_content": "enc_xyz==",
             "encrypted_metadata": "enc_meta==",
             "encrypted_dek": "enc_dek==",
         }
 
-        response = self.client.post(self.url, payload)
+        response = self.client.put(self.url + payload["public_id"] + "/", payload)
         self.assertEqual(response.status_code, 201)
         self.assertEqual(Letter.objects.count(), 1)
         self.assertEqual(Letter.objects.get().status, "DRAFT")

backend/letters/views.py

@@ -17,10 +17,11 @@ class LetterView(generics.ListCreateAPIView):
 
     def put(self, request, public_id):
         serializer = self.get_serializer(data=request.data)
+
         serializer.is_valid(raise_exception=True)
 
         letter, created = Letter.objects.update_or_create(
-            public_id=public_id, user=request.user, defaults=serializer.validated_data
+            public_id=public_id, user=self.request.user, defaults=serializer.validated_data
         )
 
         LetterImage.objects.filter(letter=letter).delete()