fix: added merchant_id to printing_order and plate_order

shipment/services.py

@@ -0,0 +1,39 @@
+"""
+Shipment 模块业务逻辑层
+"""
+from __future__ import annotations
+
+from django.db.models import QuerySet
+
+from shipment.models import SalesItem
+
+
+def get_sales_items_by_printing_order(
+    printing_order_id: int,
+    include_already_has_shipment: bool = False,
+) -> QuerySet[SalesItem]:
+    """
+    通过生产订单ID查询对应的销售品
+    
+    Args:
+        printing_order_id: 生产订单ID
+        include_already_has_shipment: 是否包含已关联出货单的销售品，默认为 False
+        
+    Returns:
+        SalesItem 查询集
+    """
+    from printing.models import PrintingJob
+    
+    # 1. 获取该生产订单下所有 PrintingJob 的 ID
+    job_ids = PrintingJob.objects.filter(
+        printing_order_id=printing_order_id
+    ).values_list('id', flat=True)
+    
+    # 2. 查询 SalesItem，过滤 printing_job_id 在这些 job_ids 中
+    queryset = SalesItem.objects.filter(printing_job_id__in=list(job_ids))
+    
+    # 3. 根据参数决定是否过滤已出货的销售品
+    if not include_already_has_shipment:
+        queryset = queryset.filter(shipment__isnull=True)
+    
+    return queryset.select_related('shipment').order_by('id')