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)),
32 sa.Column('password', sa.types.Unicode(64)),
35 expenditures = sa.Table('expenditures', meta.metadata,
36 sa.Column('id', sa.types.Integer, primary_key=True),
37 sa.Column('spender_id', sa.types.Integer,
38 sa.ForeignKey('users.id'), nullable=False),
39 sa.Column('amount', types.DBCurrency, nullable=False),
40 sa.Column('description', sa.types.Text),
41 sa.Column('date', sa.types.Date, default=datetime.now),
42 sa.Column('entered_time', sa.types.DateTime,
43 default=datetime.utcnow)
46 splits = sa.Table('splits', meta.metadata,
47 sa.Column('id', sa.types.Integer, primary_key=True),
48 sa.Column('expenditure_id', sa.types.Integer,
49 sa.ForeignKey('expenditures.id'), nullable=False),
50 sa.Column('user_id', sa.types.Integer,
51 sa.ForeignKey('users.id'), nullable=False),
52 sa.Column('share_text', sa.Text, nullable=False),
53 sa.Column('share', types.DBCurrency, nullable=False)
56 subitems = sa.Table('subitems', meta.metadata,
57 sa.Column('id', sa.types.Integer, primary_key=True),
58 sa.Column('expenditure_id', sa.types.Integer,
59 sa.ForeignKey('expenditures.id'), nullable=False),
60 sa.Column('user_id', sa.types.Integer,
61 sa.ForeignKey('users.id'), nullable=False),
62 sa.Column('amount', types.DBCurrency, nullable=False)
65 transfers = sa.Table('transfers', meta.metadata,
66 sa.Column('id', sa.types.Integer, primary_key=True),
67 sa.Column('debtor_id', sa.types.Integer,
68 sa.ForeignKey('users.id'), nullable=False),
69 sa.Column('creditor_id', sa.types.Integer,
70 sa.ForeignKey('users.id'), nullable=False),
71 sa.Column('amount', types.DBCurrency, nullable=False),
72 sa.Column('description', sa.Text, default=None),
73 sa.Column('date', sa.types.Date, default=datetime.now),
74 sa.Column('entered_time', sa.types.DateTime,
75 default=datetime.utcnow)
78 ### DB/Class Mapping ###
80 orm.mapper(User, users,
82 'expenditures': orm.relation(Expenditure,
86 orm.mapper(Expenditure, expenditures,
87 order_by=[expenditures.c.date.desc(), expenditures.c.entered_time.desc()],
89 'splits': orm.relation(Split, backref='expenditure',
90 cascade='all, delete'),
91 'subitems': orm.relation(Subitem, backref='expenditure',
92 cascade='all, delete')
95 orm.mapper(Split, splits, properties={
96 'user': orm.relation(User)
99 orm.mapper(Subitem, subitems, properties={
100 'user': orm.relation(User)
103 orm.mapper(Transfer, transfers,
104 order_by=[transfers.c.date.desc(), transfers.c.entered_time.desc()],
106 'debtor': orm.relation(User,
107 primaryjoin=(transfers.c.debtor_id==\
109 'creditor': orm.relation(User,
110 primaryjoin=(transfers.c.creditor_id==\
114 __all__ = ['users', 'expenditures', 'splits', 'subitems', 'transfers',
115 'User', 'Expenditure', 'Split', 'Subitem', 'Transfer',