you have to get the select() syntax right:
BillingInfo = relation('BillingInfo',
primaryjoin="and_(Invoice.pay2addrid==BillingInfo.pay2addrid,Invoice.customer==
select([Customer.customer]).where(Customer.xrscustid==BillingInfo.xrscustid))")
Kirk Strauser wrote:
>
> On Thursday 30 July 2009 01:31:21 pm Michael Bayer wrote:
>
>> oh, its the string. OK so dont do ForeignKeyConstraint, but definitely
>> add to the Invoice.BillingInfo relation() all the information needed
>> within the primaryjoin to select the correct row. seems like it would
>> be
>> (pseudocode) "invoice.pay2addrid=billing.pay2addrid AND
>> invoice.custinfo=select(customer.stringname).where(customer.id==billing.cus
>>tid)". The subquery should work and I don't see another way to get around
>> that.
>
> Going down that road, I tried:
>
> class Invoice(Base):
> __tablename__ = 'invoice'
> __table_args__ = dict(schema='fro')
>
> # Each invoice has a unique invid
> invid = Column(Integer, primary_key=True)
>
> # This is the name of the customer on this invoice
> customer = Column('xrscust', String(10),
> ForeignKey('fro.xrscust.xrscust'))
>
> # Some customers have multiple payment addresses, so point to the
> # one used for this specific invoice
> pay2addrid = Column(Integer, ForeignKey('fro.bllginfo.pay2addrid'))
>
> BillingInfo = relation('BillingInfo',
>
> primaryjoin="and_(Invoice.pay2addrid==BillingInfo.pay2addrid,Invoice.customer==select(Customer.customer).where(Customer.xrscustid==BillingInfo.xrscustid))")
>
> but ended up with:
>
> $ ./satest.py
> Traceback (most recent call last):
> File "./satest.py", line 67, in <module>
> invoices = session.query(Invoice)
> File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/session.py",
> line 895, in query
> return self._query_cls(entities, self, **kwargs)
> File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/query.py",
> line 91, in __init__
> self._set_entities(entities)
> File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/query.py",
> line 100, in _set_entities
> self.__setup_aliasizers(self._entities)
> File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/query.py",
> line 114, in __setup_aliasizers
> mapper, selectable, is_aliased_class = _entity_info(entity)
> File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/util.py",
> line 492, in _entity_info
> mapper = class_mapper(entity, compile)
> File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/util.py",
> line 567, in class_mapper
> mapper = mapper.compile()
> File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/mapper.py",
> line 658, in compile
> mapper._post_configure_properties()
> File "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/mapper.py",
> line 687, in _post_configure_properties
> prop.init()
> File
> "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/interfaces.py",
> line 408, in init
> self.do_init()
> File
> "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/properties.py",
> line 712, in do_init
> self._process_dependent_arguments()
> File
> "/usr/local/lib/python2.6/dist-packages/sqlalchemy/orm/properties.py",
> line 739, in _process_dependent_arguments
> setattr(self, attr, getattr(self, attr)())
> File
> "/usr/local/lib/python2.6/dist-packages/sqlalchemy/ext/declarative.py",
> line 596, in return_cls
> x = eval(arg, globals(), d)
> File "<string>", line 1, in <module>
> File
> "/usr/local/lib/python2.6/dist-packages/sqlalchemy/sql/expression.py",
> line 246, in select
> s = Select(columns, whereclause=whereclause, from_obj=from_obj,
> **kwargs)
> File
> "/usr/local/lib/python2.6/dist-packages/sqlalchemy/sql/expression.py",
> line 3239, in __init__
> [_literal_as_column(c) for c in columns]
> TypeError: 'Column' object is not iterable
>
>
> Any idea where I might start digging into that?
> --
> Kirk Strauser
>
> >
>
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