All players' and coaches' names are stored in auth_user, with roles 
(Player, Coach) listed in auth_group and assigned in auth_membership. How 
do I define the field "coach" below so that it will allow only those who 
have the Coach role? Here's the table definition.

db.define_table('sessions',
                Field('program_name', 'string', requires=IS_IN_DB(db, 
db.programs.program_name)),
                Field('session_type', 'string', 
requires=IS_IN_SET(['evaluation', 'practice'], zero=None)),
                Field('*coach*', 'string', requires=IS_IN_DB(db, 
db.auth_user.id, '%(first_name)s %(last_name)s')),
                Field('session_date', 'date'),
                Field('session_time', 'time')
               )


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