it's explained here:
http://web2py.com/books/default/chapter/29/06#Many-to-many

Den tisdagen den 21:e maj 2013 kl. 22:02:00 UTC+2 skrev [email protected]:
>
> Is there a section in the online web2py book that explains Niphlod's way 
> to building a query?
>
> Near the bottom of this 
> thread<https://groups.google.com/forum/?fromgroups=#!topic/web2py/qL1DKqeEFkA>
>  there 
> is:
>
> all_in_one = db(
>         (db.products.id == db.product_filter.product_id) &
>         (db.filters.id == db.product_filter.filter_id) 
> )
>
> Then to get all corresponding rows in product_filter table,
>
> all_in_one_hoodies = all_in_one(db.filters.name == "hoodie").select()
>
> I understand his cumbersome example, where you have to select a resultset 
> and then pass that to another select(). But I don't understand how I can 
> pass all_in_one() a parameter and how it knows to return all products which 
> have the "hoodie" filter name.
>
>
>

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