def essential():
 table = s3db.hrm_human_resource
 s3.filter = (table.essential == True)
 return s3_rest_controller('hrm', 'human_resource')

def essential ( ) : table = s3db . hrm_human_resource s3 . filter = ( table . essential == True ) return s3_rest_controller ( 'hrm' , 'human_resource' )
filtered staff controller .