Give it a try. It is in trunk. Here is an example:
$ python web2py.py -S mytest
>>> db=DAL('sqlite://storage')
>>> db.define_table('user',Field('name'))
>>> db.define_table('address',Field('city'),Field('user',db.user))
>>> db.user.insert(name="max")
1
>>> db.address.insert(user=1,city="Chicago")
1
>>> address=db.address[1]
>>> print address.city
Chicago
>>> print address.user
1
>>> print address.user.name
max
It works exactly as Mr Freeze proposed by:
1) it is backward compatible (I think)
2) it does not require adding any new keyword
3) the additional queries are lazy and cached so only executed when
needed
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