Hi, 

Web2py is nice for its expression brevity -- but  joins still need quite 
long texting..
I wanted to make it simpler, because "readability counts" 
<https://www.python.org/dev/peps/pep-0020/> :)

now you can write

build_joins( ['auth_user', 'auth_membership', 'auth_group', 
'auth_permission'] )

instead of 

[
  db.auth_membership.on( db.auth_membership.user_id == db.auth_user.id ) ),
  db.auth_group.on( db.auth_group.id == db.auth_membership.group_id ) ),
  db.auth_permission.on( db.auth_permission.group_id == db.auth_group.id ) ),]


Helper can use DB model to figure out the needed fields for join'ing 
(if it finds more than one possible field -- would throw an error with 
explatnation)

Alpha version
https://github.com/dz0/web2py_grand_helpers/blob/master/joins_builder.py

Sugestions/patches welcome :)

-- 
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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