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我有以下型号:如何根据Django中选定的外键获取模型字段值?
class OrderDetails(models.Model):
OrderID = models.ForeignKey(Orders)
Product = models.ForeignKey('SystemSetup.Products', unique=False)
Quantity = models.DecimalField('Quantity', max_digits=18, decimal_places=0, default=1)
Price = models.DecimalField('Price', max_digits=18, decimal_places=2)
def __unicode__(self):
return "%s" % (self.OrderID)
我想要得到的Price
价值,但必须取决于所选择的Product
:
我也用内联的admin:
class OrderInlines(admin.TabularInline):
model = OrderDetails
extra = 1
readonly_fields = ['Price']
class OrdersAdmin(admin.ModelAdmin):
fieldsets = [
('Order by:', {'fields': ['CustomerID']}),
('Detailes', {'fields': ['CashierID', 'OrderDate']}),
]
list_display = ('OrderID', 'CashierID', 'CustomerID', 'OrderDate')
list_filter = ['OrderID', 'CashierID', 'CustomerID', 'OrderDate']
search_fields = ['OrderID', 'CashierID__EmployeeName', 'CustomerID__CustomerName', 'OrderDate']
inlines = [OrderInlines]
如何计算总价格(quantity * price)
?