Ah I was really close. This worked:
class TagMixin(object):
@declared_attr
def tags(cls):
class Tag(BaseModel):
__tablename__ = "tag_%s" % cls.__tablename__
id = Column(types.Integer, primary_key=True)
time_created = Column(types.DateTime, default=datetime.now,
nullable=False)
row_id = Column(types.Integer, ForeignKey(cls.id), index=True)
name = Column(types.String, nullable=False, index=True)
cls.TagClass = Tag
return orm.relationship(Tag, backref='tagged')
class User(BaseModel, TagMixin):
__tablename__ = 'user'
id = Column(types.Integer, primary_key=True)
...
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