feat: added jobs_status_summary to printing orders api

api_v1/views/printing/views.py

@@ -123,6 +123,10 @@ class PrintingOrderViewSet(LimitedModelViewSet):
     - created_date_to: 创建日期结束
     - search: 全文搜索（客户名称、面料、地区、工艺）
     - ordering: 排序字段
+    
+    返回字段说明:
+    - jobs_status_summary: 订单下所有印染任务按当前状态分组的数量汇总
+      格式: [{"state_name": "进度一", "state_id": 1, "count": 3}, ...]
     """
     queryset = models.PrintingOrder.objects.all()
     permission_classes = [DjangoModelPermissions]
@@ -157,6 +161,21 @@ class PrintingOrderViewSet(LimitedModelViewSet):
         queryset = super().get_queryset()
         if self.action in ['list', 'retrieve']:
             queryset = queryset.select_related('customer')
+            # 预取 printing_jobs 及其 business_object，用于状态汇总统计
+            # 同时预取 state_logs 和 process 相关数据以减少 job.status 属性调用时的 N+1 查询
+            queryset = queryset.prefetch_related(
+                Prefetch(
+                    'printing_jobs',
+                    queryset=models.PrintingJob.objects.select_related(
+                        'business_object',
+                        'business_object__process',
+                    ).prefetch_related(
+                        'business_object__state_logs',
+                        'business_object__process__process_nodes',
+                        'business_object__process__process_nodes__state',
+                    )
+                )
+            )
         return queryset
     
     def destroy(self, request, *args, **kwargs):