def update_cash_holding(portfolio, amount):
"""
update cash holdings after security buy/sell
"""
#print "updating portfolioholding with amount:", amount
# amount in cents. need to store $.
amount = dollarize(amount)
print 'amount to update in $:', amount
cash_obj, created = Security.objects.get_or_create(symbol='CASH')
try:
cash_holding = PortfolioHolding.objects.get(portfolio=portfolio,
security=cash_obj)
print 'held' + str(cash_holding.held)
print 'add' + str(amount)
print 'new held' + str(cash_holding.held + amount)
cash_holding.held = cash_holding.held + amount
print 'cash_holding.held', cash_holding.held
cash_holding.save()
except PortfolioHolding.DoesNotExist:
print 'cash holding does not exists.'
new_holding = PortfolioHolding()
new_holding.portfolio = portfolio
new_holding.security = cash_obj
new_holding.held = amount
new_holding.average_price = 1
new_holding.last_price = 1
new_holding.save()
def update_holdings(portfolio, security):
"""
takes portfolio and security and updates for that security.
add to held if not present
update security holding if held.
"""
holding = None
try:
holding = PortfolioHolding.objects.get(portfolio=portfolio, security=security)
except PortfolioHolding.DoesNotExist:
# no holdings row exists for this security.
new_holding = PortfolioHolding()
new_holding.portfolio = portfolio
new_holding.security = security
new_holding.held = 0
new_holding.average_price = 0
new_holding.last_price = 0
new_holding.save()
holding = new_holding
transactions = Transaction.objects.all().filter(portfolio=portfolio, security=security)
held = 0;
if security.symbol == 'CASH':
for tran in transactions:
if tran.type.name == 'Deposit':
held = held + tran.amount
elif tran.type.name == 'Withdraw':
held = held - tran.amount
print 'found it: ', held
held = held / 100.00
print 'after: ', held
else:
for tran in transactions:
if tran.type.name == 'Buy':
held = held + tran.units
elif tran.type.name == 'Sell':
held = held - tran.units
holding.held = str(held)
holding.save()
