[web2py] access control(RBAC)

[Rohitraj Sharma]

i have so many group, i want according to group user can access the
data. For example  admin have all controls of CURD,normal user can
view data , manager van view and edit, some other user can view only
few tabs of menu.Please help me i am able to do . i have more then 50
tabs, tab have also show according to user. admin can see all tab.
other user depending on rool .