feat: add new api and fix some problems

core/apps/documents/views/executor.py

@@ -0,0 +1,47 @@
+from rest_framework import status
+from rest_framework.response import Response
+from rest_framework.views import APIView
+
+from core.apps.documents.models import ExecutorInfoModel
+from core.apps.documents.serializers.executor import ExecutorInfoSerializer
+
+
+class ExecutorInfoView(APIView):
+    """Singleton endpoint — faqat bitta ExecutorInfo yozuvi bo'ladi."""
+
+    def get(self, request, *args, **kwargs):
+        instance = ExecutorInfoModel.objects.order_by("created_at").first()
+        if not instance:
+            return Response({}, status=status.HTTP_200_OK)
+        return Response(ExecutorInfoSerializer(instance).data)
+
+    def post(self, request, *args, **kwargs):
+        if ExecutorInfoModel.objects.exists():
+            return Response(
+                {"detail": "ExecutorInfo allaqachon mavjud. Yangilash uchun PUT/PATCH ishlating."},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
+        serializer = ExecutorInfoSerializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+        serializer.save()
+        return Response(serializer.data, status=status.HTTP_201_CREATED)
+
+    def put(self, request, *args, **kwargs):
+        return self._upsert(request, partial=False)
+
+    def patch(self, request, *args, **kwargs):
+        return self._upsert(request, partial=True)
+
+    def delete(self, request, *args, **kwargs):
+        instance = ExecutorInfoModel.objects.order_by("created_at").first()
+        if not instance:
+            return Response(status=status.HTTP_404_NOT_FOUND)
+        instance.delete()
+        return Response(status=status.HTTP_204_NO_CONTENT)
+
+    def _upsert(self, request, partial):
+        instance = ExecutorInfoModel.objects.order_by("created_at").first()
+        serializer = ExecutorInfoSerializer(instance, data=request.data, partial=partial)
+        serializer.is_valid(raise_exception=True)
+        serializer.save()
+        return Response(serializer.data)