首先,我是python的新手,这是我的第一篇文章所以,请告诉我,如果我在这里做错了,我很乐意解决它。
我正在使用Python 2.7.15rc1和Peewee 3.6.4
我想要实现的是创建一个继承自peewee模型和PySide.QtCore的QObject的类。像这样:
class BaseModel(Model, QObject):
id = PrimaryKeyField()
class Meta:
database = db
def __str__(self):
return str(self.__dict__)
def __eq__(self, other):
return self.id == other.id
但是这个配置给我带来了以下错误:
TypeError: Error when calling the metaclass bases
metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
如果我尝试将Model指定为所需的元类(并且我认为它是可以的,因为基本上我只需要“与QObject的关系”是真的)通过将其添加到BaseModel:
__metaclass__ = Model
抛出以下错误:
AttributeError: 'Model' object has no attribute '_meta'
另外,通过关注这个link,我已将代码更改为:
class A (Model):
pass
class B (QObject):
pass
class C(A, B):
pass
class BaseModel(A, B):
__metaclass__ = C
id = PrimaryKeyField()
class Meta:
database = db
def __str__(self):
return str(self.__dict__)
def __eq__(self, other):
return self.id == other.id
但是元类冲突仍然存在。
我在这附近做错了什么?
好。最后我通过这样做解决了这个问题:
class Metaclass_Model(Model.__class__):
pass
class Metaclass_QObject(QObject.__class__):
pass
class MultiMetaclass(Metaclass_Model, Metaclass_QObject):
pass
class BaseModel(Model, QObject):
__metaclass__ = MultiMetaclass
id = PrimaryKeyField()
class Meta:
database = db
def __str__(self):
return str(self.__dict__)
def __eq__(self, other):
return other is not None and self.id == other.id
它工作正常,即使Eclipse一直显示此错误:
Undefined variable from import: __class__
在这一行:
class Metaclass_Model(Model.__class__):