Hi,
Is it possible to have an association_proxy (in the association object
pattern) that emulates a set-based collection if it goes through a
lazy='dynamic' relationship? I can't for the life of me find a way to
make this work (setting collection_class on the dynamic relationship
doesn't seem to do anything).
Here's some example code of what I'm trying to do, extracted from the
actual project:
class ProofOfWork(object):
blocks = association_proxy('Intermediatory_nodes', 'block')
proof_of_work = Table('proof_of_work', db.metadata)
mapper(ProofOfWork, proof_of_work, properties={
'Intermediatory_nodes': relationship(lambda: Intermediatory,
lazy = 'dynamic'),
})
class Block(object):
proof_of_works = association_proxy('Intermediatory_nodes',
'proof_of_work')
block = Table('block', db.metadata)
mapper(Block, block, properties={
'Intermediatory_nodes': relationship(lambda: Intermediatory,
lazy = 'dynamic'),
})
class Intermediatory(object):
pass
intermediatory = Table('intermediatory', db.metadata,
Column('proof_of_work_id', Integer,
ForeignKey('proof_of_work.id'),
nullable = False),
Column('block_id', Integer,
ForeignKey('block.id')),
)
mapper(Intermediatory, intermediatory, properties={
'proof_of_work': relationship(lambda: ProofOfWork,
back_populates = 'Intermediatory_nodes',
remote_side = lambda: proof_of_work.c.id),
'block': relationship(lambda: Block,
back_populates = 'Intermediatory_nodes',
remote_side = lambda: block.c.id),
})
How can I make ProofOfWork.blocks and Block.proof_of_works return an
_AssociationSet instead of _AssociationList?
Cheers,
Mark
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