> > I'm a little puzzled by the common_filter syntax. It looks a >> common_filter must be a function that takes a single argument, query, and >> returns a query that, in the book examples at least, doesn't reference the >> argument. I'm guessing that the argument is the query that would be >> executed if the common_filter was None, right? So does is the query that >> gets finally executed equivalent to db(query & common_filter) ? >> > Yes, that's basically it, though it will add the common_filter query for all tables involved in the select. See http://code.google.com/p/web2py/source/browse/gluon/dal.py#1255 and http://code.google.com/p/web2py/source/browse/gluon/dal.py#1720 to see what's happening. In the for loop, the current query is always passed to the common_filter function -- I'm not sure what use case that is supposed to support, but obviously you can just ignore it in your function.
Anthony
