1 """The application's model objects"""
2 import sqlalchemy as sa
3 from sqlalchemy import orm
5 from bluechips.model.user import User
6 from bluechips.model.expenditure import Expenditure
7 from bluechips.model.split import Split
8 from bluechips.model.subitem import Subitem
9 from bluechips.model.transfer import Transfer
11 from bluechips.model import meta
12 from bluechips.model import types
14 from datetime import datetime
16 def init_model(engine):
17 """Call me before using any of the tables or classes in the model"""
19 sm = orm.sessionmaker(autoflush=True, bind=engine)
22 meta.Session = orm.scoped_session(sm)
24 ### Database Schemas ###
26 users = sa.Table('users', meta.metadata,
27 sa.Column('id', sa.types.Integer, primary_key=True),
28 sa.Column('username', sa.types.Unicode(32), nullable=False),
29 sa.Column('name', sa.types.Unicode(64)),
30 sa.Column('resident', sa.types.Boolean, default=True),
31 sa.Column('email', sa.types.Unicode(64))
34 expenditures = sa.Table('expenditures', meta.metadata,
35 sa.Column('id', sa.types.Integer, primary_key=True),
36 sa.Column('spender_id', sa.types.Integer,
37 sa.ForeignKey('users.id'), nullable=False),
38 sa.Column('amount', types.DBCurrency, nullable=False),
39 sa.Column('description', sa.types.Text),
40 sa.Column('date', sa.types.Date, default=datetime.now),
41 sa.Column('entered_time', sa.types.DateTime,
42 default=datetime.utcnow)
45 splits = sa.Table('splits', meta.metadata,
46 sa.Column('id', sa.types.Integer, primary_key=True),
47 sa.Column('expenditure_id', sa.types.Integer,
48 sa.ForeignKey('expenditures.id'), nullable=False),
49 sa.Column('user_id', sa.types.Integer,
50 sa.ForeignKey('users.id'), nullable=False),
51 sa.Column('share', types.DBCurrency, nullable=False)
54 subitems = sa.Table('subitems', meta.metadata,
55 sa.Column('id', sa.types.Integer, primary_key=True),
56 sa.Column('expenditure_id', sa.types.Integer,
57 sa.ForeignKey('expenditures.id'), nullable=False),
58 sa.Column('user_id', sa.types.Integer,
59 sa.ForeignKey('users.id'), nullable=False),
60 sa.Column('amount', types.DBCurrency, nullable=False)
63 transfers = sa.Table('transfers', meta.metadata,
64 sa.Column('id', sa.types.Integer, primary_key=True),
65 sa.Column('debtor_id', sa.types.Integer,
66 sa.ForeignKey('users.id'), nullable=False),
67 sa.Column('creditor_id', sa.types.Integer,
68 sa.ForeignKey('users.id'), nullable=False),
69 sa.Column('amount', types.DBCurrency, nullable=False),
70 sa.Column('description', sa.Text, default=None),
71 sa.Column('date', sa.types.Date, default=datetime.now),
72 sa.Column('entered_time', sa.types.DateTime,
73 default=datetime.utcnow)
76 ### DB/Class Mapping ###
78 orm.mapper(User, users,
80 'expenditures': orm.relation(Expenditure,
84 orm.mapper(Expenditure, expenditures,
85 order_by=[expenditures.c.date.desc(), expenditures.c.entered_time.desc()],
87 'splits': orm.relation(Split, backref='expenditure',
88 cascade='all, delete'),
89 'subitems': orm.relation(Subitem, backref='expenditure',
90 cascade='all, delete')
93 orm.mapper(Split, splits, properties={
94 'user': orm.relation(User)
97 orm.mapper(Subitem, subitems, properties={
98 'user': orm.relation(User)
101 orm.mapper(Transfer, transfers,
102 order_by=[transfers.c.date.desc(), transfers.c.entered_time.desc()],
104 'debtor': orm.relation(User,
105 primaryjoin=(transfers.c.debtor_id==\
107 'creditor': orm.relation(User,
108 primaryjoin=(transfers.c.creditor_id==\
112 __all__ = ['users', 'expenditures', 'splits', 'subitems', 'transfers',
113 'User', 'Expenditure', 'Split', 'Subitem', 'Transfer',