As you can see, this is a Set, not just an attribute. When you select from a 
table that has FK, Pydal forms Sets for related tables, Set is the type that db 
(...) returns

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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