def add_participants(event, newbies):
"""Add participants in event. Takes dict, where keys - is account
models and values is participation part(int)."""
if len(newbies) == 0:
return
# calc party-pay,
participants = Participation.objects.filter(event=event, active=True)
exist_parts = participants.aggregate(s=Sum('parts'))['s']
exist_parts = 0.0 if exist_parts is None else exist_parts # fix None
all_parts = exist_parts + sum(newbies.values())
party_pay = event.price / all_parts
recalcers = participants.filter(~Q(account__in=newbies.keys()))
parent_transactions = []
# participate incomers
for (acc, parts) in newbies.items():
# if not already participated
participation = Participation.objects.filter(account=acc, event=event,
active=False)
if len(participation) == 0:
participation = Participation(account=acc, parts=parts,
event=event)
else:
participation = participation[0]
participation.active = True
participation.save()
tr = Transaction(participation=participation,
type=Transaction.PARTICIPATE)
tr.credit = party_pay * parts
parent_transactions.append(tr)
tr.save()
# create diffs for old participants
# if no recalcers(incomers if first participants) we have exist_parts = 0
for newbie_transaction in parent_transactions:
for participation in recalcers:
assert (exist_parts != 0),\
"On add participants when we need recalc exist participants\
exist_parts should be positive(not zero)"
debit = ((newbie_transaction.credit / exist_parts)
* participation.parts)
return_money(participation, debit, newbie_transaction)
def add_participants(event, newbies):
"""Add participants in event. Takes dict, where keys - is account
models and values is participation part(int)."""
# calc party-pay,
participants = Participation.objects.filter(event=event, active=True)
exist_parts = participants.aggregate(s=Sum('parts'))['s']
exist_parts = 0.0 if exist_parts is None else exist_parts # fix None
all_parts = exist_parts + sum(newbies.values())
party_pay = event.price / all_parts
recalcers = participants.filter(~Q(account__in=newbies.keys()))
parent_transactions = []
# participate incomers
for (acc, parts) in newbies.items():
# if not already participated
participation = Participation.objects.filter(account=acc, active=False)
if len(participation) == 0:
participation = Participation(account=acc,
parts=parts,
event=event)
else:
participation = participation[0]
participation.active = True
participation.save()
tr = Transaction(participation=participation,
type=Transaction.PARTICIPATE)
tr.credit = party_pay * parts
parent_transactions.append(tr)
tr.save()
# create diffs for old participants
# if no recalcers(incomers if first participants) we have exist_parts = 0
for newbie_transaction in parent_transactions:
for participation in recalcers:
assert (exist_parts != 0),\
"On add participants when we need recalc exist participants\
exist_parts should be positive(not zero)"
debit = ((newbie_transaction.credit / exist_parts) *
participation.parts)
return_money(participation, debit, newbie_transaction)
def delegate_debt(participation, credit, parent):
"""Make diff transactions for given participation(event,user) with given
credit. This means, that we get money from user and spend it to event.
@param participation: Event-User link that for create transaction
@type participation: Participation
@param debit: Money count that was returned
@type debit: float
@param parent: Parent transaction, that initiate return(incomer for
example)
@type parent: Transaction
"""
t = Transaction(participation=participation, type=Transaction.DIFF,
parent=parent)
t.credit = credit
t.save()
def delegate_debt(participation, credit, parent):
"""Make diff transactions for given participation(event,user) with given
credit. This means, that we get money from user and spend it to event.
@param participation: Event-User link that for create transaction
@type participation: Participation
@param debit: Money count that was returned
@type debit: float
@param parent: Parent transaction, that initiate return(incomer for
example)
@type parent: Transaction
"""
t = Transaction(participation=participation,
type=Transaction.DIFF,
parent=parent)
t.credit = credit
t.save()
