feat: added print_count api, added merchant setting model, added manual mode setting for purchase order

api_v1/views/print_count.py

@@ -0,0 +1,57 @@
+from django.db import transaction
+from django.db.models import F
+from rest_framework import permissions, status
+from rest_framework.response import Response
+from rest_framework.views import APIView
+
+from api_v1.serializers import PrintCountDeltaSerializer
+from api_v1.enums import PrintCountObjectType
+from printing import models as printing_models
+
+
+class PrintCountDeltaView(APIView):
+    """通用打印次数递增接口"""
+
+    permission_classes = [permissions.IsAuthenticated]
+
+    OBJECT_MODEL_MAP = {
+        PrintCountObjectType.PRINTING_ORDER: printing_models.PrintingOrder,
+        PrintCountObjectType.PLATE_ORDER: printing_models.PlateOrder,
+    }
+
+    def post(self, request, *args, **kwargs):
+        serializer = PrintCountDeltaSerializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+        data = serializer.validated_data
+
+        model = self.OBJECT_MODEL_MAP.get(data['object_type'])
+        if model is None:
+            return Response(
+                {'detail': '不支持的对象类型'},
+                status=status.HTTP_400_BAD_REQUEST,
+            )
+
+        with transaction.atomic():
+            updated = model.objects.filter(id=data['object_id']).update(
+                print_count=F('print_count') + data['delta']
+            )
+            if not updated:
+                return Response(
+                    {'detail': '指定对象不存在'},
+                    status=status.HTTP_404_NOT_FOUND,
+                )
+            fresh_value = model.objects.only('print_count').get(id=data['object_id']).print_count
+
+        return Response(
+            {
+                'object_type': data['object_type'],
+                'object_id': data['object_id'],
+                'delta': data['delta'],
+                'print_count': fresh_value,
+            },
+            status=status.HTTP_200_OK,
+        )
+
+
+adjust_print_count = PrintCountDeltaView.as_view()
+