It seems that hybrid properties are not allowed to be specified as strings
for the order_by parameter of a relationship; attempting it fails with
"InvalidRequestError: Class <...> does not have a mapped column named
'...'". Is this a known limitation or a bug? Sample test case below.
Thanks,
George
#============================================================
from sqlalchemy import Column, Integer, String, ForeignKey, case
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.ext.hybrid import hybrid_property
from sqlalchemy.orm import relationship
Base = declarative_base()
class User(Base):
__tablename__ = 'user'
id = Column(Integer, primary_key=True)
firstname = Column(String(50))
lastname = Column(String(50))
game_id = Column(Integer, ForeignKey('game.id'))
@hybrid_property
def fullname(self):
if self.firstname is not None:
return self.firstname + " " + self.lastname
else:
return self.lastname
@fullname.expression
def fullname(cls):
return case([
(cls.firstname != None, cls.firstname + " " + cls.lastname),
], else_=cls.lastname)
class Game(Base):
__tablename__ = 'game'
id = Column(Integer, primary_key=True)
name = Column(String(50))
if 0: # this works
users = relationship("User", order_by=User.fullname)
else: # this fails
users = relationship("User", order_by="User.fullname")
if __name__ == '__main__':
game = Game(name="tetris")
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