Django：limit_choices_to（这是对的）

Is this correct?

它是否正确？

class Customer(models.Model):
    account = models.ForeignKey(Account)


class Order(models.Model):
    account = models.ForeignKey(Account)
    customer = models.ForeignKey(Customer, limit_choices_to={'account': 'self.account'})

I'm trying to make sure that an Order form will only display customer choices that belong to the same account as the Order.

我正在尝试确保订单表单只显示与订单属于同一帐户的客户选择。

If I'm overlooking some glaring bad-design fallacy, let me know.

如果我忽略了一些明显糟糕的设计谬误，请告诉我。

The main thing I'm concerned with is:

我关心的主要是：

limit_choices_to={'account': 'self.account'}

3 个解决方案

#1

The only answer to 'is it correct' is 'does it work when you run it?' The answer to that of course is no, so I don't know why you're asking here.

“它是否正确”的唯一答案是“运行时它是否有效？”答案当然是否定的，所以我不知道你为什么在这里问。

There's no way to use limit_choices_to dynamically to limit based on the value of another field in the current model. The best way to do this is by customising the form. Define a ModelForm subclass, and override the __init__ method:

根据当前模型中另一个字段的值，无法动态使用limit_choices_to来限制。最好的方法是自定义表单。定义ModelForm子类，并覆盖__init__方法：

class MyOrderForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(MyOrderForm, self).__init__(*args, **kwargs)
        if 'initial' in kwargs:
             self.fields['customer'].queryset = Customer.objects.filter(account=initial.account)

#2

You should set choices field of your order form (inherited from ModelForm) in the constructor.

您应该在构造函数中设置订单表单的选择字段（继承自ModelForm）。

#3

-1

limit_choices_to={'account': 'self.account'} is wrong, since foreign key to customer cannot point to Account.

limit_choices_to = {'account'：'self.account'}是错误的，因为客户的外键不能指向Account。

#1