I want to insert a form include two fields coursename and  teache_id 
reference auth_user,as students and teachers in the same table(auth_user),so 
I want to filter content of dropdown in SQLFORM only to show the role is 
teacher,so i do this 
query=(db.auth_membership.user_id==db.auth_user.id)(db.courses.teacher_id==db.auth_user.id)(db.auth_membership.group_id==db.auth_group.id)(db.auth_group.role=='teacher')
db.courses.teacher_id.requires=IS_IN_DB(db(query),'db.auth_user.id')
form=SQLFORM(db.courses)
return dict(form=form)
but it comes out error:'Query' object is not callable
maybe there is error in query so I test it  in mysql like this:
select auth_user.id
from auth_user,auth_membership,auth_group
where auth_membership.user_id = auth_user.id and 
auth_membership.group_id=auth_group.id and auth_group.role='teacher'



it's ok!
who can help me!

Thanks
jian

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