The purpose of the list reference in blogpost is so if I'm showing a single 
blogpost I don't have to do another query to know which tags it has.

The blogpost_tag is used when you want to search blogposts which have a tag 
so you don't use contains.

-- 
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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