python - 最大递归深度超出 getter Django

Question

我有一些带有特定属性的自定义 getter 的类:

class Item(a, b, c, d, models.Model):
     title = Field()
     description = Field()
     a = Field()
     _custom_getter = ['title','description']

     def __getattribute__(self, name):
         if name in self.custom_getter:
             return 'xxx'
         else:
             return super(Item, self).__getattribute__(name)

此代码引发RunetimeError:调用Python对象时超出最大递归深度但是当我使用这段代码时:

class Item(a, b, c, d, models.Model):
    title = Field()
    description = Field()
    a = Field()

    def __getattribute__(self, name):
        custom_getter = ['title','description']
        if name in custom_getter:
            return 'xxx'
        else:
            return super(Item, self).__getattribute__(name)

一切都如我所愿。我的第一段代码的错误在哪里？

Answer 1

因为当您执行 self.custom_getter 时，__getattribute__ 会被调用。您可以使用 self.__dict__ 来实现此目的。了解更多 How is the __getattribute__ method used?

class Item(a, b, c, d, models.Model):
     title = Field()
     description = Field()
     a = Field()
     custom_getter = ['title','description']

     def __getattribute__(self, name):
         if name in self.__dict__['custom_getter']:
             return 'xxx'
         else:
             return super(Item, self).__getattribute__(name)