Ahh!! Starting to understand it. In this case, the entire expression to
primaryjoin must be a string. The explanation about eval'ing the string when
mappers are compiled makes sense.
Now I see the relation in GHZ's example and in the code I will be writing
should look something like this.
boston_addresses = relation('Address',
primaryjoin = "and_(User.user_id==Address.user_id,Address.city=='Boston')"
)
--
Mike Conley
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