Thank you very much!
On Wednesday, August 1, 2012 4:20:23 PM UTC+2, Michael Bayer wrote:
>
> oh, sorry, that's a mixin. this combination of variables is not supported
> at this time. You need to use an event:
>
> from sqlalchemy import event
> from sqlalchemy.orm import mapper
> @event.listens_
oh, sorry, that's a mixin. this combination of variables is not supported at
this time. You need to use an event:
from sqlalchemy import event
from sqlalchemy.orm import mapper
@event.listens_for(mapper, "mapper_configured")
def set_num_children(mapper, cls):
if not issubclass(cls, MPTT):
Thanks Michael, I greatly appreciate your help. But I am still a bit
confused. To set the attribute I need to have the alias for MPTT (or,
actually any class that inherits MPTT mixin class) table. But I can not use
aliased() neither inside the MPTT definition nor after it — in both cases I
get
On Jul 31, 2012, at 11:42 AM, Sergey Kucheryavski wrote:
> I would like to use Mixin to make a base class for MPTT trees, just as an
> example
>
> class MPTT(object):
> @declared_attr
> def __tablename__(cls):
> return cls.__name__.lower()
>
> id = db.Column(db.Integer, pri
I would like to use Mixin to make a base class for MPTT trees, just as an
example
class MPTT(object):
@declared_attr
def __tablename__(cls):
return cls.__name__.lower()
id = db.Column(db.Integer, primary_key = True)
level = db.Column(db.Integer, nullable = False)
lft
