I'm building an admin interface to auth_membership. With
auth_membership, a user can belong to multiple groups. The standard
form made by crud.update from the auth_membership table is a 2
pulldown affair. This is cumbersome to use when there are many users
and many groups. It takes too many user selects and group selects and
submits when assigning even one user to multiple groups.

Therefore, I am building a custom interface. First, I select a user
from a users=crud.select(...) list. Then, I want a custom form that
shows the user name followed by a checklist of all the groups to which
the user could potentially belong. Groups to which the user already
belongs will have their checkbox checked in the form.

It seems like this is such a typical thing to want to do that there
should be something built-in to do it already. Or that someone has a
slice for it or a plugin. Massimo's plugin  
http://web2py.com/plugins/default/multiselect
seems like it could do the trick, but I can't seem to get it to work
for me in this case since auth_membership looks like a black box to
me. Any suggestions for how to go about doing what I want to do?

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