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
I was getting ready to do something similar, and now I am confused.
How is what GHZ is doing fundamentally different from the documentation
example Specifying Alternate Join Conditions to relation()? Doesn't that
example wrap the primaryjoin in the and_() construct also?
Mike Conley wrote:
I was getting ready to do something similar, and now I am confused.
How is what GHZ is doing fundamentally different from the documentation
example Specifying Alternate Join Conditions to relation()? Doesn't that
example wrap the primaryjoin in the and_() construct also?
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.
