Hi! Got this setup:
class Document(Base):
__tablename__ = 'document'
discriminator = Column('type', String(30))
__mapper_args__ = {'polymorphic_identity':'document',
'polymorphic_on': discriminator}
id = Column(Integer, primary_key=True)
your metaclass must derive from the DeclarativeMeta class.
Also, I disagree that you need this metaclass, what you're trying to do is
very easy using mixins, which are supported in version 0.6:
http://docs.sqlalchemy.org/en/rel_0_6/orm/extensions/declarative.html#mixing-in-columns
On Jul
I'd discourage using metaclasses as they are more difficult to use in cases
like these than mixins, which can accomplish the vast majority of use cases.
I can't help with your metaclass case since there is no code here to work with,
but in general a dynamic __mapper_args__, whether using a
Hey all -
SQLAlchemy release 0.8.2 is now available.
0.8.2 includes several dozen bug fixes and new features, including refinement
of some of the new features introduced in 0.8.
Areas of improvement include Core, ORM, as well as specific fixes for dialects
such as Postgresql, MySQL, Oracle,
I'm trying to get a certain access pattern to work and I need a bit of help:
https://gist.github.com/deontologician/5922496
What I'm trying to do is use an association proxy to create a view of a
collection that looks like a list of dictionaries (for serializing to
json). I also want to update
On Jul 3, 2013, at 4:33 PM, Josh Kuhn deontologic...@gmail.com wrote:
I'm trying to get a certain access pattern to work and I need a bit of help:
https://gist.github.com/deontologician/5922496
What I'm trying to do is use an association proxy to create a view of a
collection that looks
On Jul 3, 2013, at 5:06 PM, Michael Bayer mike...@zzzcomputing.com wrote:
Do the UPDATE through Session.execute() so it's within the same transaction.
.. or even just query(Gadget).with_parent(some_widget).update({machine_id:
some_widget.machine_id}), then you can have those Gadget objects
I've attempted the following:
from sqlalchemy import Column, Integer, String, ForeignKey, create_engine
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.event import listen
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.ext.associationproxy import
On Jul 3, 2013, at 5:52 PM, Josh Kuhn habi...@gmail.com wrote:
I still get an integrity error because the after_flush happens after I've
already tried to insert the null gadgets. If I move the flush after the
widget is added to the session, but before the gadgets are, then the
On Wed, Jul 3, 2013 at 7:30 PM, Michael Bayer mike...@zzzcomputing.comwrote:
@event.listens_for(Gadget, before_insert)
def before_gadget(mapper, connection, target):
target.machine_id = target.widget.machine_id
2. when widget is updated, gadgets need new machine_id, here UPDATE is
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