112 lines
4.0 KiB
Python
112 lines
4.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
from django.db import models
|
|
from django.core.validators import *
|
|
from django.contrib.auth.models import User
|
|
from django.db.models.deletion import SET_NULL
|
|
from django.db.models.signals import pre_delete
|
|
from decimal import Decimal
|
|
|
|
from validator import validate_notZero
|
|
|
|
class TransactionType(models.Model):
|
|
""" Type for a :class:`Transaction`. States how the money has
|
|
been added to the account and if somebody needs to check
|
|
if it was payed. """
|
|
name = models.CharField(max_length=100)
|
|
needsCheck = models.BooleanField(default=True)
|
|
|
|
def __unicode__(self):
|
|
return unicode(self.name)
|
|
|
|
class Transaction(models.Model):
|
|
"""Represents a money transaction into the users account. """
|
|
user = models.ForeignKey(User)
|
|
transactionType = models.ForeignKey(TransactionType, verbose_name='Typ')
|
|
dateTime = models.DateTimeField(auto_now_add=True)
|
|
amount = models.DecimalField(max_digits=8, decimal_places=2, validators=[validate_notZero])
|
|
checked = models.BooleanField(default=False)
|
|
|
|
def __unicode__(self):
|
|
return u"%s for user %s (%s),%schecked" % (self.amount, self.user, self.transactionType, (self.checked and " " or " not "))
|
|
|
|
def save(self, *args, **kwargs):
|
|
profile = self.user.get_profile()
|
|
if self.id == None:
|
|
# insert
|
|
profile.balance += self.amount
|
|
else:
|
|
# update
|
|
oldobj = Transaction.objects.get(id=self.id)
|
|
if oldobj.user != self.user:
|
|
oldprofile = oldobj.user.get_profile()
|
|
oldprofile.balance -= oldobj.amount
|
|
oldprofile.save()
|
|
# just to be save, reget profile
|
|
profile = self.user.get_profile()
|
|
profile.balance += self.amount
|
|
else:
|
|
profile.balance += (self.amount-oldobj.amount)
|
|
profile.save()
|
|
super(Transaction, self).save(*args, **kwargs)
|
|
|
|
@staticmethod
|
|
def pre_delete_signal(sender, instance, **kwargs):
|
|
profile = instance.user.get_profile()
|
|
profile.balance -= instance.amount
|
|
profile.save()
|
|
|
|
pre_delete.connect(Transaction.pre_delete_signal, sender=Transaction)
|
|
|
|
class VirtualTransaction(models.Model):
|
|
""" Represents a transaction between two users. """
|
|
user = models.ForeignKey(User, null=True, on_delete=SET_NULL)
|
|
recipient = models.ForeignKey(User, related_name='receivedtransaction', null=True, on_delete=SET_NULL, verbose_name=u'Empfänger')
|
|
dateTime = models.DateTimeField(auto_now_add=True)
|
|
amount = models.DecimalField(max_digits=8, decimal_places=2, validators=[MinValueValidator(Decimal("0.01"))], verbose_name='Betrag')
|
|
comment = models.CharField(max_length=100, verbose_name='Verwendungszweck')
|
|
|
|
def __unicode__(self):
|
|
return u"%s ==> %s: %s Euro" % (self.user, self.recipient, self.amount)
|
|
|
|
@staticmethod
|
|
def moveMoney(fromUser, toUser, amount, commit=True):
|
|
if fromUser != toUser:
|
|
fromProfile = fromUser.get_profile()
|
|
toProfile = toUser.get_profile()
|
|
fromProfile.balance -= amount
|
|
toProfile.balance += amount
|
|
if commit:
|
|
fromProfile.save()
|
|
toProfile.save()
|
|
|
|
def save(self, *args, **kwargs):
|
|
if self.user and self.recipient:
|
|
oldobj = None
|
|
try:
|
|
oldobj = VirtualTransaction.objects.get(id=self.id)
|
|
except VirtualTransaction.DoesNotExist:
|
|
pass
|
|
|
|
if oldobj and (oldobj.user != self.user or oldobj.recipient != self.recipient):
|
|
VirtualTransaction.moveMoney(oldobj.recipient, oldobj.user, oldobj.amount)
|
|
VirtualTransaction.moveMoney(self.user, self.recipient, self.amount)
|
|
else:
|
|
tmpAmount = None
|
|
if oldobj == None:
|
|
tmpAmount = self.amount
|
|
else:
|
|
tmpAmount = self.amount - oldobj.amount
|
|
VirtualTransaction.moveMoney(self.user, self.recipient, tmpAmount)
|
|
super(VirtualTransaction, self).save(*args, **kwargs)
|
|
|
|
@staticmethod
|
|
def pre_delete_signal(sender, instance, **kwargs):
|
|
""" Pre delete signal to ensure consistent balances on object delete. """
|
|
# Only revert if both users exist.
|
|
if instance.user and instance.recipient:
|
|
# revert transaction
|
|
VirtualTransaction.moveMoney(instance.recipient, instance.user, amount)
|
|
|
|
pre_delete.connect(VirtualTransaction.pre_delete_signal, sender=VirtualTransaction)
|
|
|