Hi Michael,
Am Mittwoch, den 27.10.2010, 13:37 -0400 schrieb Michael Bayer:
> Configuration is too unwieldy ? Since you're using declarative ,
> just using @declared_attr would give you access to the class:
Nice one. I missed classproperty and declared_attr so far.
> def make_ordered_list(key, pk, type_):
> @declared_attr
> def go(cls):
> class Name(Base):
> __tablename__ = "%s_names" % key
> rel_id = Column("related_id", Integer, ForeignKey(pk),
> primary_key=True, index=True)
> position = Column("position", Integer)
> value = Column("value", type_, primary_key=True)
> def __init__(self, value):
> self.value = value
> private_key = "_" + key
>
> setattr(cls, key, association_proxy(private_key, "value"))
Now that's a hefty trick, updating the class when reading the property.
I think this should be protected against running twice!? Or does the ORM
mapper do this for us?
> if you wanted to get rid of saying "_names", you need to create
> something that is added after the fact:
Yep, or add a placeholder into the class and have the mapper replace it
by the real thing. I'll look into that!
Thanks for all you support wrt. SQLAlchemy, I am always impressed how
you can come up with helpful answers in virtually no time. I tried the
Donate button on SA.org so you can have a beer on my expenses :-)
Greetings, Torsten
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