python - Cant change class on SQLAlchemy -


hello trying change class in sqlalchemy because giving me error, error is:

file "<string>", line 2, in __init__ file "c:\python34\lib\site-packages\sqlalchemy\orm\instrumentation.py", line 324, in _new_state_if_none     state = self._state_constructor(instance, self)   file "c:\python34\lib\site-packages\sqlalchemy\util\langhelpers.py", line 725, in __get__     obj.__dict__[self.__name__] = result = self.fget(obj)   file "c:\python34\lib\site-packages\sqlalchemy\orm\instrumentation.py", line 158, in _state_constructor     self.dispatch.first_init(self, self.class_)   file "c:\python34\lib\site-packages\sqlalchemy\event\attr.py", line 260, in __call__     fn(*args, **kw)   file "c:\python34\lib\site-packages\sqlalchemy\orm\mapper.py", line 2693, in _event_on_first_init     configure_mappers()   file "c:\python34\lib\site-packages\sqlalchemy\orm\mapper.py", line 2589, in configure_mappers     mapper._post_configure_properties()   file "c:\python34\lib\site-packages\sqlalchemy\orm\mapper.py", line 1694, in _post_configure_properties     prop.init()   file "c:\python34\lib\site-packages\sqlalchemy\orm\interfaces.py", line 144, in init     self.do_init()   file "c:\python34\lib\site-packages\sqlalchemy\orm\relationships.py", line 1549, in do_init     self._process_dependent_arguments()   file "c:\python34\lib\site-packages\sqlalchemy\orm\relationships.py", line 1605, in _process_dependent_arguments     self.target = self.mapper.mapped_table   file "c:\python34\lib\site-packages\sqlalchemy\util\langhelpers.py", line 725, in __get__     obj.__dict__[self.__name__] = result = self.fget(obj)   file "c:\python34\lib\site-packages\sqlalchemy\orm\relationships.py", line 1535, in mapper     % (self.key, type(argument))) sqlalchemy.exc.argumenterror: relationship 'prod_comm_rel' expects class or mapper argument (received: <class 'sqlalchemy.sql.schema.column'>)

but never change error keeps comming, class:

class product(base):     __tablename__="xxxxxx_reg"      __table_args__ = {"useexisting": true}      id = column("id",bigint, primary_key=true)     name = column("_name",text, nullable=false)     code = column("code", bigint, unique=true)     status = column("status",bigint, foreignkey(status.code),nullable=false)     description = column("description",text, nullable=false)     avatar = column("avatar", text, nullable=false)     type = column("_type",bigint, foreignkey(type.id),nullable=false)     price = column("price",numeric(20,2),nullable=false)     costs = column("costs",numeric(20,2),default=0.00)     commcode = column("commerce", bigint, foreignkey(commerce.code), nullable=false)      #relation     prod_status_rel = relationship(status, backref=backref("product"))     prod_type_rel = relationship(type, backref=backref("product"))     prod_comm_rel = relationship(commerce, backref=backref("product"))      def __repr__(self):         return "<product(id='%s', name='%s', status='%s', description='%s', " \                "type='%s', price='%s', costs='%s', code='%s',commerce='%s')>"%(self.id, self.name,                                                                         self.status,self.description,                                                   self.type, self.price, self.costs, self.code, self.commcode)      metadata = metadata()       product_tbl = table(__tablename__, metadata,id,name,status,description, type,price, costs, code, commcode)      engine = conection().conorm()     metadata.create_all(engine)

how can fix code, because made change , when run class alone works, problem when try run other parts of codes


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