feat: purchase_order approve and calcel

business/models.py

@@ -1,3 +1,4 @@
+from decimal import Decimal
 from django.db import models
 from flower.common import ModelBase
 from basic_info import models as basic_info_models
@@ -64,6 +65,15 @@ class PurchaseOrder(ModelBase):
         verbose_name = '采购单'
         verbose_name_plural = '采购单'
 
+    def get_total_amount(self) -> Decimal:
+        return sum(item.total_amount() for item in self.items.all())
+
+    def get_total_quantity(self) -> Decimal:
+        return sum(item.quantity for item in self.items.all())
+
+    def get_total_diff_quantity(self) -> Decimal:
+        return sum(item.diff_quantity() for item in self.items.all())
+
 
 class PurchaseOrderItem(ModelBase):
     """采购单明细模型"""
@@ -83,8 +93,9 @@ class PurchaseOrderItem(ModelBase):
     )
     price = models.DecimalField(max_digits=15, decimal_places=2, verbose_name='单价')
     color = models.CharField(max_length=50, null=True, blank=True, verbose_name='颜色')
-    quantity = models.PositiveIntegerField(verbose_name='数量')
+    quantity = models.DecimalField(max_digits=10, decimal_places=2, verbose_name='数量')
     unit = models.CharField(max_length=50, verbose_name='单位')
+    spec = models.CharField(max_length=100, null=True, blank=True, verbose_name='规格')
     empty_diff_percent = models.DecimalField(
         max_digits=15, 
         decimal_places=2,