def validate_credits(credit_trades):
errors = []
temp_storage = []
for credit_trade in credit_trades:
from_starting_index, from_starting_balance = CreditTradeService. \
get_temp_balance(temp_storage, credit_trade.credits_from.id)
to_starting_index, to_starting_balance = CreditTradeService. \
get_temp_balance(temp_storage, credit_trade.credits_to.id)
from_credits_remaining = from_starting_balance - \
credit_trade.number_of_credits
to_credits_remaining = to_starting_balance + \
credit_trade.number_of_credits
CreditTradeService.update_temp_balance(
temp_storage, from_starting_index, from_credits_remaining,
credit_trade.credits_from.id)
CreditTradeService.update_temp_balance(temp_storage,
to_starting_index,
to_credits_remaining,
credit_trade.credits_to.id)
if from_credits_remaining < 0:
errors.append("[ID: {}] "
"Can't complete transaction,"
"`{}` has insufficient credits.".format(
credit_trade.id,
credit_trade.credits_from.name))
if len(errors) > 0:
raise PositiveIntegerException(errors)
def transfer_credits(_from, _to, credit_trade_id, num_of_credits,
effective_date):
"""
Make the appropriate addition and reduction to the credits for the
organizations Involved
"""
from_starting_bal, _ = OrganizationBalance.objects.get_or_create(
organization_id=_from.id,
expiration_date=None,
defaults={'validated_credits': 0})
to_starting_bal, _ = OrganizationBalance.objects.get_or_create(
organization_id=_to.id,
expiration_date=None,
defaults={'validated_credits': 0})
# Compute for end balance
from_credits = from_starting_bal.validated_credits - num_of_credits
to_credits = to_starting_bal.validated_credits + num_of_credits
if from_credits < 0:
raise PositiveIntegerException("Can't complete transaction,"
"`{}` has insufficient credits"
.format(_from.name))
# Update old balance effective date
from_starting_bal.expiration_date = effective_date
to_starting_bal.expiration_date = effective_date
# Create new fuel supplier balance
from_new_bal = OrganizationBalance(
organization=_from,
validated_credits=from_credits,
effective_date=effective_date,
credit_trade_id=credit_trade_id
)
to_new_bal = OrganizationBalance(
organization=_to,
validated_credits=to_credits,
effective_date=effective_date,
credit_trade_id=credit_trade_id
)
# Save everything
from_starting_bal.save()
to_starting_bal.save()
from_new_bal.save()
to_new_bal.save()
def transfer_credits(_from, _to, credit_trade_id, num_of_credits,
effective_date):
from_starting_bal = OrganizationBalance.objects.get(
organization_id=_from.id, expiration_date=None)
to_starting_bal = OrganizationBalance.objects.get(
organization_id=_to.id, expiration_date=None)
# Compute for end balance
from_credits = from_starting_bal.validated_credits - num_of_credits
to_credits = to_starting_bal.validated_credits + num_of_credits
if 0 > from_credits:
raise PositiveIntegerException("Can't complete transaction,"
"insufficient credits")
# Update old balance effective date
from_starting_bal.expiration_date = effective_date
to_starting_bal.expiration_date = effective_date
# Create new fuel supplier balance
from_new_bal = OrganizationBalance(organization=_from,
validated_credits=from_credits,
effective_date=effective_date,
credit_trade_id=credit_trade_id)
to_new_bal = OrganizationBalance(organization=_to,
validated_credits=to_credits,
effective_date=effective_date,
credit_trade_id=credit_trade_id)
# Save everything
from_starting_bal.save()
to_starting_bal.save()
from_new_bal.save()
to_new_bal.save()