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from sqlalchemy import types as T
from sqlalchemy import sql, Index, Column, ForeignKey, create_engine
from sqlalchemy.orm import relationship, backref, scoped_session, sessionmaker,\
column_property
from sqlalchemy.ext.declarative import declarative_base, declared_attr
from sqlalchemy.ext.hybrid import hybrid_property
import datetime
import decimal
from functools import partial
from collections import namedtuple
__all__ = ["Category", "SingleExpense", "ConstExpense", "CatExpense", "MonthExpense",
"Session"]
#
# DB Setup
#
engine = create_engine("sqlite:///test.sqlite")
engine.echo = True
Session = scoped_session(sessionmaker(bind=engine))
#
# Global definitions
#
class Base(object):
@declared_attr
def __tablename__ (cls):
return cls.__name__.lower()
id = Column(T.Integer, primary_key=True)
query = Session.query_property()
@classmethod
def get_by (cls, *args, **kwargs):
return cls.query.filter_by(*args, **kwargs).first()
@classmethod
def get (cls, *args, **kwargs):
return cls.query.get(*args, **kwargs)
Base = declarative_base(cls=Base)
ReqColumn = partial(Column, nullable = False)
ExpNum = T.Numeric(scale = 2, precision = 10)
def to_exp(d):
"""Converts decimal into expense"""
return d.quantize(decimal.Decimal('.01'), rounding = decimal.ROUND_UP)
#
# Database Entities
#
class Category (Base):
name = ReqColumn(T.Unicode(50), unique = True)
parent_id = Column(T.Integer, ForeignKey('category.id'))
children = relationship('Category',
backref=backref('parent', remote_side="Category.id"))
def __repr__ (self):
if self.parent:
return '<Category "%s" of "%s">' % (self.name, self.parent.name)
else:
return '<Category "%s">' % self.name
class Expense (Base):
__abstract__ = True
description = Column(T.Unicode(50))
expense = ReqColumn(ExpNum)
@declared_attr
def category_id(cls):
return ReqColumn(T.Integer, ForeignKey(Category.id))
@declared_attr
def category(cls):
return relationship(Category, innerjoin = True)
class SingleExpense (Expense):
year = ReqColumn(T.Integer)
month = ReqColumn(T.SmallInteger)
day = ReqColumn(T.SmallInteger)
@classmethod
def of_month (cls, month, year):
comp = sql.and_(
cls.month == month,
cls.year == year)
return cls.query.filter(comp)
@property
def date (self):
return datetime.date(self.year, self.month, self.day)
@date.setter
def date (self, d):
self.year = d.year
self.month = d.month
self.day = d.day
class ConstExpense (Expense):
months = ReqColumn(T.SmallInteger)
start = ReqColumn(T.Date, index = True)
end = ReqColumn(T.Date, index = True)
prev_id = Column(T.Integer, ForeignKey('constexpense.id'))
prev = relationship('ConstExpense', remote_side = "ConstExpense.id", uselist = False,
backref=backref('next', uselist = False))
@property
def monthly(self):
return to_exp(self.expense / self.months)
@classmethod
def of_month (cls, month, year):
d = datetime.date(year, month, 1)
return cls.query.filter(sql.between(d, cls.start, cls.end))
#
# Work entities (not stored in DB)
#
class CatExpense (namedtuple('CatExpense', 'cat expense exps')):
__slots__ = ()
@property
def all (self):
return self.exps.order_by(SingleExpense.day).all()
class MonthExpense (namedtuple('MonthExpense', 'date catexps')):
def __init__ (self, *args, **kwargs):
self._consts = None
super(MonthExpense, self).__init__(*args, **kwargs)
@property
def consts (self):
if self._consts is None:
self._consts = ConstExpense.of_month(self.date.month, self.date.year).all()
return self._consts
@property
def constsum (self):
s = sum(c.monthly for c in self.consts)
return s or 0
@property
def sum (self):
return self.constsum + sum(x.expense for x in self.catexps)
@property
def all (self):
return SingleExpense.of_month(self.date.month, self.date.year).order_by(SingleExpense.day).all()
def __str__ (self):
return '<MonthExpense of "%s": %s>' % (self.date, self.sum)
#
# Extra indizes have to be here
#
Index('idx_single_date', SingleExpense.year, SingleExpense.month)
Index('idx_start_end', ConstExpense.start, ConstExpense.end)
if __name__ == "__main__":
Base.metadata.create_all(engine)
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