By specifying requires = IS_IN_SET(ids), you are also overriding the represent 
too.

See below, I hope it will point you in the right direction:

mygroupdict = {1:'Public',2:'Private',3:'Admin'}
db.auth_membership.group_id.requires = IS_IN_SET(mygroupdict,zero=None))
db.auth_membership.group_id.represent = lambda group_id, row: mygroupdict[
group_id]

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