Django 为嵌套外键定义 __str__

Question

使用这样的嵌套模型:

class Gov(models.Model):
    name = models.CharField(max_length=20)
    def __str__(self):
        return self.name

class State(models.Model):
    parent = models.ForeignKey(Gov)
    abbreviation = models.CharField(max_length=100)
    def __str__(self):
        return self.parent.name

class State_Park(models.Model):
    parent = models.ForeignKey(State)
    park_name = models.CharField(max_length=100)

如何将类 State_Park 的 __str__ 设置为 class Gov 中的 name？

我试过:

def __str__(self):
    return self.parent.parent.name

这没有用。

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Users\ccsv\Envs\wenv\lib\site-packages\django\db\models\query.py", line 229, in __repr__
    return '<%s %r>' % (self.__class__.__name__, data)
  File "C:\Users\ccsv\Envs\wenv\lib\site-packages\django\db\models\base.py", line 589, in __repr__
    u = six.text_type(self)
  File "C:\Users\ccsv\Desktop\wenv\mysite\stats\models.py", line 89, in __str__
    return self.parent.parent.name()
TypeError: 'str' object is not callable

Answer 1

 File "C:\Users\ccsv\Desktop\wenv\mysite\stats\models.py", line 89, in __str__
return self.parent.parent.name()

根据错误日志，我认为您应该删除行尾的括号。

    def __str__(self):
        return self.parent.parent.name