feat: purchase order item model

business/admin.py

@@ -5,7 +5,33 @@ from . import models
 
 @admin.register(models.PurchaseOrder)
 class PurchaseOrderAdmin(admin.ModelAdmin):
-    list_display = ('id', 'supplier', 'order_date', 'total_amount')
+    list_display = ('id', 'supplier', 'purchase_date', 'operator', 'created_at')
     search_fields = ('supplier__name',)
-    list_filter = ('order_date',)
-    ordering = ('-order_date',)
+    list_filter = ('operator', 'warehouse', 'created_at')
+    ordering = ('-created_at',)
+
+
+@admin.register(models.PurchaseOrderItem)
+class PurchaseOrderItemAdmin(admin.ModelAdmin):
+    list_display = (
+        'id', 'purchase_order', 'product', 
+        'quantity', 'unit', 'price', 'batch_number',
+        '_total_amount', 'empty_diff_percent', 
+        '_real_quantity', '_diff_quantity',
+        'num_of_rolls', 
+    )
+    search_fields = ('purchase_order__id', 'product__name')
+    list_filter = ('purchase_order__operator', 'purchase_order__warehouse', 'created_at')
+    ordering = ('-created_at',)
+
+    @admin.display(description='实际数量')
+    def _real_quantity(self, obj: models.PurchaseOrderItem):
+        return obj.real_quantity()
+
+    @admin.display(description='差异数量')
+    def _diff_quantity(self, obj: models.PurchaseOrderItem):
+        return obj.diff_quantity()
+
+    @admin.display(description='总金额')
+    def _total_amount(self, obj: models.PurchaseOrderItem):
+        return obj.total_amount()