Dear all,
I've the following tables:
site_table = Table('site', metadata,
Column('id', types.Integer, primary_key=True),
Column('name', types.Unicode(15), nullable=False))
chain_table = Table('chain', metadata,
Column('id', types.Integer, primary_key=True),
Column('letter', types.Unicode(1), nullable=False),
Column('ec_number', types.Unicode(50), nullable=True))
sites_chains_table = Table('sites_chains', metadata,
Column('site_id', types.Integer,
ForeignKey('site.id'),primary_key=True),
Column('chain_id', types.Integer,ForeignKey('chain.id'),
primary_key=True))
and the following mappers:
mapper(Site, site_table,
properties={'chain': relationship(Chain, backref='site',
secondary=sites_chains_table), })
mapper(Chain, chain_table)
Which query I've to write to count all site where
chain.ec_number==something using its relation.
I tried to do something like:
count =
Session.query(func.count(Site.id)).filter(Chain.ec_number==ec_number).filter(Site.chain.any(id=Chain.id)).all()
but the result isn't real.
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