根据对象字段为 limit_choices_to 选择查询集 [英] Choose queryset for limit_choices_to based on object fields

问题描述

我试图将外部字段的选择限制为那些看起来像对象自身的其他对象.

I am trying to limit the choices of a foreign field to those other objects who look like the object self.

我已经试过了:

class Model1(models.Model):
    entry = models.ForeignKey(Model2, limit_choices_to='get_limit_choices_to')
    number = IntegerField()

    def get_limit_choices_to(self):
        return Model2.objects.filter(expenditure_type=self.expenditure_type)

class Model2(models.Model):
    number = IntegerField()

但我收到错误

_filter_or_exclude() argument after ** must be a mapping, not str

我不知道 limit_choices_to 是否是正确的方法.也许我应该选择 a 中的查询集或视图.

I don't know if limit_choices_to is the right way to do this. Maybe I should choose the queryset in a or the views.

错误表明 limit_choices_to='get_limit_choices_to' 是一种错误的引用方法的方式，但是我该如何正确引用该方法呢?我不能用

The error says that limit_choices_to='get_limit_choices_to' is a wrong way to refer to the method, but how can I refer to the method correctly? I can't use

limit_choices_to=lambda: {'model1_set': self}

也没有

limit_choices_to=lambda: {'number': number}

我使用的是 Django 1.7.

I am using Django 1.7.

推荐答案

你的函数应该在模型之前.并且应该返回一个字典

Your function should be before the model. And should return an dictionary

def get_limit_choices_to():
    return {'entry': Model2.objects.get(number=1).id}

class Model1(models.Model):
    entry = models.ForeignKey(Model2, limit_choices_to=get_limit_choices_to)
    number = IntegerField()

class Model2(models.Model):
    number = IntegerField()

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