from bluechips.model.split import Split
from bluechips.model import meta
from bluechips.model.types import Currency
+from bluechips.model.tag import Tag
from decimal import Decimal
+from datetime import datetime
import random
class Expenditure(object):
+ def __init__(self, spender=None, amount=Currency(0), description=u"",
+ date=None):
+ self.spender = spender
+ self.amount = amount
+ self.description = description
+ if self.date == None:
+ self.date = datetime.now()
+
def __repr__(self):
return '<Expenditure: spender: %s spent: %s>' % (self.spender,
self.amount)
split_percentage = Decimal(100) / Decimal(residents.count())
self.split(dict((resident, split_percentage) for resident in residents))
- def split(self, split_dict):
+ def split(self, split_dict, split_text_dict):
"""
Split up an expenditure.
total = sum(split_dict.itervalues())
- for user, share in split_dict.iteritems():
- split_dict[user] = share / total
+ for user, share in split_dict.items():
+ if share == 0:
+ del split_dict[user]
amounts_dict = dict()
for user, share in split_dict.iteritems():
- amounts_dict[user] = Currency(split_dict[user] * self.amount)
+ amounts_dict[user] = Currency((share * self.amount) / total)
difference = self.amount - sum(amounts_dict.itervalues())
winner = random.choice(amounts_dict.keys())
amounts_dict[winner] += Currency(1)
elif difference < 0:
- for i in xrange(difference):
+ for i in xrange(-difference):
winner = random.choice(amounts_dict.keys())
amounts_dict[winner] -= Currency(1)
for user, share in amounts_dict.iteritems():
- s = Split()
- s.expenditure = self
- s.user = user
- s.share = share
- meta.Session.save(s)
+ s = Split(self, user, share, split_text_dict[user])
+ meta.Session.add(s)
+
+ def tag(self, tags):
+ map(meta.Session.delete,
+ meta.Session.query(Tag).filter_by(expenditure_id=self.id))
+
+ for tag in tags:
+ t = Tag(self, tag)
+ meta.Session.add(t)
+
+ def involves(self, user):
+ "Returns True if ``user`` is involved in this expenditure."
+ return (any((split.user == user) and (split.share != 0)
+ for split in self.splits) or
+ (self.spender == user))
+
+ def share(self, user):
+ "Return the share corresponding to ``user``."
+ shares = dict((split.user, split.share)
+ for split in self.splits)
+ return shares.get(user, Currency(0))
__all__ = ['Expenditure']