A few novice questions while learning the SQLFORM.grid on a throw-away app. 
  My apologies for the basic questions

*1) How to show all users (auth_user) and related group roles 
(auth_group.role) only for certain auth_groups?*

I can display *all* groups with the following code, but can't seem to 
figure out how to get the WHERE clause to SQLFORM.grid.

    query = db.auth_user
    
    fields = db.auth_user.first_name, db.auth_group.role
    
    left = db.auth_user.on(
        db.auth_user.id == 
db.auth_membership.user_id).db.auth_membership.on(
            db.auth_membership.group_id == db.auth_group.id)

    grid = SQLFORM.grid(query = query, left=left, fields=fields)

My failed attempts to get the WHERE clause inserted:

query = (db.auth_group.id == PARENT_GROUP_ID)  #No auth_user fields shown

query = (db.auth_user)&(db.auth_group.id == PARENT_GROUP_ID)  #get query 
not supported error by the grid


*2) How to custom-format a column based on field values?*

In the above grid example, if an auth_group.role of "Parent" is returned, 
how can show something like a check mark (or any like boolean yes/no flag) 
and nothing for anything other auth_group.role values?


Thanks in advance.   A little nudge getting me through some the syntax 
learning curve is much appreciated.


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