I'm having trouble inheriting a synonym property from a mixin class.
It obviously works if the call to synonym() is on the child class and
just the get/set methods are left on the mixin. Here is an example:
from sqlalchemy import create_engine, Column, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import scoped_session, sessionmaker, synonym
from sqlalchemy.types import Integer, String
engine = create_engine('sqlite:///:memory:', echo=True)
Base = declarative_base(bind=engine)
Session = scoped_session(sessionmaker(bind=engine))
class WithAge(object):
_age = Column('age', Integer)
def _get_age(self):
return self._age or -1
def _set_age(self, age):
self._age = age
# Doesn't work
age = synonym('_age', descriptor=property(_get_age, _set_age))
class Person(Base, WithAge):
__tablename__ = 'people'
name = Column(String, primary_key=True)
# Works
#age = synonym('_age', descriptor=property(WithAge._get_age,
WithAge._set_age))
p = Person()
print p.age # <sqlalchemy.orm.properties.SynonymProperty object
at ...>
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