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, transactional=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)
33 expenditures = sa.Table('expenditures', meta.metadata,
34 sa.Column('id', sa.types.Integer, primary_key=True),
35 sa.Column('spender_id', sa.types.Integer,
36 sa.ForeignKey('users.id'), nullable=False),
37 sa.Column('amount', types.DBCurrency, nullable=False),
38 sa.Column('description', sa.types.Text),
39 sa.Column('date', sa.types.Date, default=datetime.now),
40 sa.Column('entered_time', sa.types.DateTime,
41 default=datetime.utcnow)
44 splits = sa.Table('splits', 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('share', types.DBCurrency, nullable=False)
53 subitems = sa.Table('subitems', meta.metadata,
54 sa.Column('id', sa.types.Integer, primary_key=True),
55 sa.Column('expenditure_id', sa.types.Integer,
56 sa.ForeignKey('expenditures.id'), nullable=False),
57 sa.Column('user_id', sa.types.Integer,
58 sa.ForeignKey('users.id'), nullable=False),
59 sa.Column('amount', types.DBCurrency, nullable=False)
62 transfers = sa.Table('transfers', meta.metadata,
63 sa.Column('id', sa.types.Integer, primary_key=True),
64 sa.Column('debtor_id', sa.types.Integer,
65 sa.ForeignKey('users.id'), nullable=False),
66 sa.Column('creditor_id', sa.types.Integer,
67 sa.ForeignKey('users.id'), nullable=False),
68 sa.Column('amount', types.DBCurrency, nullable=False),
69 sa.Column('description', sa.Text, default=None),
70 sa.Column('date', sa.types.Date, default=datetime.now),
71 sa.Column('entered_time', sa.types.DateTime,
72 default=datetime.utcnow)
75 ### DB/Class Mapping ###
77 orm.mapper(User, users,
79 'expenditures': orm.relation(Expenditure,
83 orm.mapper(Expenditure, expenditures, order_by=expenditures.c.date.desc(),
85 'splits': orm.relation(Split, backref='expenditure',
86 cascade='all, delete'),
87 'subitems': orm.relation(Subitem, backref='expenditure',
88 cascade='all, delete')
91 orm.mapper(Split, splits, properties={
92 'user': orm.relation(User)
95 orm.mapper(Subitem, subitems, properties={
96 'user': orm.relation(User)
99 orm.mapper(Transfer, transfers, order_by=transfers.c.date.desc(),
101 'debtor': orm.relation(User,
102 primaryjoin=(transfers.c.debtor_id==\
104 'creditor': orm.relation(User,
105 primaryjoin=(transfers.c.creditor_id==\
109 __all__ = ['users', 'expenditures', 'splits', 'subitems', 'transfers',
110 'User', 'Expenditure', 'Split', 'Subitem', 'Transfer',