split_percentage = Decimal(100) / Decimal(residents.count())
self.split(dict((resident, split_percentage) for resident in residents))
- def update_split(self):
- """
- Re-split an expenditure using the same percentages as what is
- currently in the database
- """
-
- old_splits = meta.Session.query(Split).filter(Split.expenditure==self)
- split_dict = dict((s.user, Decimal(int(s.share))) for s in old_splits)
- self.split(split_dict)
-
def split(self, split_dict):
"""
Split up an expenditure.
for user, share in split_dict.items():
if share == 0:
del split_dict[user]
- else:
- split_dict[user] = share / total
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())
s = Split(self, user, share)
meta.Session.add(s)
+ 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']