1 """The application's model objects"""
2 import sqlalchemy as sa
3 from sqlalchemy import orm
5 from bluechips.model import meta
6 from bluechips.model import types
8 def init_model(engine):
9 """Call me before using any of the tables or classes in the model"""
11 sm = orm.sessionmaker(autoflush=True, transactional=True, bind=engine)
14 meta.Session = orm.scoped_session(sm)
16 ### Database Schemas ###
18 users = sa.Table('users', meta.metadata,
19 sa.Column('id', sa.types.Integer, primary_key=True),
20 sa.Column('username', sa.types.Unicode(32), nullable=False),
21 sa.Column('name', sa.types.Unicode(64)),
22 sa.Column('resident', sa.types.Boolean, default=True)
25 expenditures = sa.Table('expenditures', meta.metadata,
26 sa.Column('id', sa.types.Integer, primary_key=True),
27 sa.Column('spender_id', sa.types.Integer,
28 sa.ForeignKey('users.id'), nullable=False),
29 sa.Column('amount', types.Currency, nullable=False),
30 sa.Column('date', sa.types.Date, default=sa.func.now),
31 sa.Column('entered_time', sa.types.DateTime,
35 splits = sa.Table('splits', meta.metadata,
36 sa.Column('id', sa.types.Integer, primary_key=True),
37 sa.Column('expenditure_id', sa.types.Integer,
38 sa.ForeignKey('expenditures.id'), nullable=False),
39 sa.Column('user_id', sa.types.Integer,
40 sa.ForeignKey('users.id'), nullable=False),
41 sa.Column('share', sa.types.Integer, nullable=False)
44 subitems = sa.Table('subitems', meta.metadata,
45 sa.Column('id', sa.types.Integer, primary_key=True),
46 sa.Column('expenditure_id', sa.types.Integer,
47 sa.ForeignKey('expenditures.id'), nullable=False),
48 sa.Column('user_id', sa.types.Integer,
49 sa.ForeignKey('users.id'), nullable=False),
50 sa.Column('amount', types.Currency, nullable=False)
53 transfers = sa.Table('transfers', meta.metadata,
54 sa.Column('id', sa.types.Integer, primary_key=True),
55 sa.Column('debtor_id', sa.types.Integer,
56 sa.ForeignKey('users.id'), nullable=False),
57 sa.Column('creditor_id', sa.types.Integer,
58 sa.ForeignKey('users.id'), nullable=False),
59 sa.Column('amount', types.Currency, nullable=False),
60 sa.Column('date', sa.types.Date, default=sa.func.now),
61 sa.Column('entered_time', sa.types.DateTime,
63 sa.Column('desc', sa.Text, default=None)
70 return '<User: %w>' % (self.username)
72 class Expenditure(object):
74 return '<Expenditure: spender: %s spent: %s>' % (self.spender,
79 return '<Split: expense: %s user: %s share: %s%%>' % (self.expenditure,
83 class Subitem(object):
85 return '<Subitem: expense: %s user: %s cost: %s>' % (self.expense,
89 class Transfer(object):
91 return '<Transfer: from %s to %s for %s>' % (self.debtor,
95 ### DB/Class Mapping ###
97 orm.mapper(User, users)
99 orm.mapper(Expenditure, expenditures, properties={
100 'spender': orm.relation(User, backref='expenditures')
103 orm.mapper(Split, splits, properties={
104 'expenditure': orm.relation(Expenditure, backref='splits'),
105 'user': orm.relation(User)
108 orm.mapper(Subitem, subitems, properties={
109 'expenditure': orm.relation(Expenditure, backref='subitems'),
110 'user': orm.relation(User)
113 orm.mapper(Transfer, transfers, properties={
114 'debtor': orm.relation(User,
115 primaryjoin=(transfers.c.debtor_id==\
117 'creditor': orm.relation(User,
118 primaryjoin=(transfers.c.creditor_id==\
122 __all__ = [users, expenditures, splits, subitems, transfers,
123 User, Expenditure, Split, Subitem, Transfer,