得到错误“ rel_model”的意外值预期的“ Model”，“ Proxy”，“ DeferredRelation”或“ self”

Question

我有以下课程

class User(db.Model, UserMixin):
    user = peewee.CharField(max_length=255)
    email = peewee.CharField(max_length=256)

class UserRoles(db.Model):
    user = peewee.ForeignKeyField(User, related_name="roles")

我有export FLASK_APP=run.py 所以当我从终端运行flask create_user（测试用户）时，我得到了错误提示：

Unexpected value for "rel_model" Expected "Model", "Proxy", "DeferredRelation", or "self"

Answer 1

尝试将userMixin作为第一类，然后将db.Model作为第二类。多继承在Python中有点奇怪。