gistfile1.txt

Reset_Requests_table = db.Table('Reset_Requests', db.Model.metadata,
    db.Column('student_id', db.Integer, db.ForeignKey('user.id')),
    db.Column('teacher_id', db.Integer, db.ForeignKey('user.id')),
    db.Column('approved', db.Boolean)
)

class Reset_Requests(object):
    pass

mapper(Reset_Requests, Reset_Requests_table,
    polymorphic_on=Reset_Requests_table.c.type,
    properties={
        'alt':Reset_Requests_table.c.some_alt
    })