belongs to one table but not the other ...

[Vlad]

I have the following select to get the ids that are in one table, also belonging to another table:

db(db.cart.id.belongs(another_table_select)).select(db.cart.id)

I can't figure out how to do just the opposite - to get the ids that do NOT belong to the other table, i.e. exist in one table but not the other. 

How do I specify opposite of "belongs" in such a query?

. 

[Andrew Rogers]

Try adding a '~' in front of it.

db(~(db.cart.id.belongs(another_table_select))).select(db.cart.id)

See: http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer?search=lazy#Logical-operators

[Eliezer (Vlad) Tseytkin]

Thank you!

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