feat: added n-to-1 relation between sales_order_item and printing_job model

printing/models.py

@@ -1,3 +1,5 @@
+from decimal import Decimal
+
 from django.conf import settings
 from django.db import models
 from flower.common import ModelBase
@@ -289,6 +291,13 @@ class PrintingOrder(ModelBase):
         return int((completed_count / jobs.count()) * 100)
 
 
+class PrintingJobWorkStateEnum(models.IntegerChoices):
+    PRODUCING = 0, '生产中'
+    WAITING_FOR_DELIVERY = 1, '待送货'
+    WAITING_FOR_INVOICE = 2, '待开单'
+    FINISHED = 3, '已完结'
+
+
 class PrintingJob(ModelBase):
     """PrintingJob model representing a printing job associated with an order."""
     printing_order = models.ForeignKey(
@@ -303,6 +312,11 @@ class PrintingJob(ModelBase):
         related_name='printing_jobs', 
         verbose_name='产品',
     )
+    work_state = models.IntegerField(
+        choices=PrintingJobWorkStateEnum.choices,
+        default=PrintingJobWorkStateEnum.PRODUCING,
+        verbose_name='业务进展',
+    )
     quantity = models.PositiveIntegerField(verbose_name='数量')
     unit = models.CharField(max_length=50, verbose_name='单位')
     size = models.CharField(max_length=100, null=True, blank=True, verbose_name='一段尺寸')
@@ -320,6 +334,16 @@ class PrintingJob(ModelBase):
     def __str__(self):
         return self.printing_order.human_id
 
+    @property
+    def billed_quantity(self) -> Decimal:
+        """
+        开单数量：所有关联销售明细的数量之和
+        """
+        from business.models import SalesOrderItem
+
+        total = self.sales_order_items.aggregate(total=models.Sum('quantity')).get('total')
+        return total or Decimal('0')
+
     @property
     def status(self) -> str:
         """