python - 通过@property 中的字段列表获取相关对象的值

Question

我有两个这样的模型，具有以下字段:

Profile: 
    -user(OTO Relation to User)
    -address(OTO to Address)
    -bio
    -gender
    ...
Address: 
    -postal_code
    -phone_number
    -zip_code

我还有这个字段名称列表:

 my_list = ["bio","gender","address.postal_code","address.phone_number", "address.zip_code"]

最后我想创建这个@property:

@property
def is_complete_profile(self):
    ''' Checks if all the fields have been filled '''
    if self.pk:
        for field_name in my_list:
            value = getattr(self,field_name)
            if not value:
                return False
        return True
    else:
        return False

但是对于相关对象，这不是正确的方法，我得到了这个错误:

'Profile' object has no attribute 'address.postal_code'

如何使用此列表获取 Profile 对象的字段值和相关对象值？

注意:

I could solve this problem by using eval function, but because of this and this post, I preferred to throw this solution away.

Answer 1

与其让 Profile 窥探其同类的内部结构，不如为每个涉及的类提供一个 is_complete 属性(或方法)来确定实例是否完整，并让 Profile.is_complete_profile 访问这些属性以确定配置文件是否完整。

像这样的(未经测试)

class Address:

    def is_complete(self):
        fields = ["postal_code", "phone_number", "zip_code"]
        for field in fields:
            if not getattr(self, field):
                return False
        return True

class Profile:

    def is_complete(self):
        fields = ["bio","gender"]
        for field in fields:
            if not getattr(self, field):
                return False
        return True

    @property
    def is_complete_profile(self):
        ''' Checks if all the fields have been filled '''
        if self.pk:
            return self.is_complete() and self.address.is_complete()
        return False

这样，如果 Address 字段的名称发生变化，则 Profile 无需更改，如果将其他对象添加到概念中，则只需要进行最小的更改的“完整性”。