GHZ wrote:
>
> boston_addresses = relation('Address',
> primaryjoin = and_
> ('User.user_id==Address.user_id',
>
> 'Address.city=="Boston"'),
> foreign_keys = ['Address.user_id'])
the expression sent to primaryjoin must be an expression construct, or a
string which can be eval'ed to produce one. You can't wrap the
to-be-eval'ed construct inside of an expression construct (i.e. and_() in
this case).
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