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90 lines
3.4 KiB
90 lines
3.4 KiB
# -*- coding: utf-8 -*-
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from django.db import models
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from django.core.validators import *
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from django.contrib.auth.models import User
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from django.db.models.deletion import SET_NULL
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from django.db.models.signals import pre_delete
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from decimal import Decimal
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class TransactionType(models.Model):
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""" Type for a :class:`Transaction`. States how the money has
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been added to the account and if somebody needs to check
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if it was payed. """
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name = models.CharField(max_length=100)
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needsCheck = models.BooleanField(default=True)
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def __unicode__(self):
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return unicode(self.name)
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class Transaction(models.Model):
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"""Represents a money transaction into the users account. """
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user = models.ForeignKey(User)
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transactionType = models.ForeignKey(TransactionType, verbose_name='Typ')
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dateTime = models.DateTimeField(auto_now_add=True)
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amount = models.DecimalField(max_digits=8, decimal_places=2, validators=[MinValueValidator(Decimal("0.01"))])
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checked = models.BooleanField(default=False)
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def __unicode__(self):
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return u"%s for user %s (%s),%schecked" % (self.amount, self.user, self.transactionType, (self.checked and " " or " not "))
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# TODO: Find out what would happen if parent save/delete does not like us
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def save(self, *args, **kwargs):
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profile = self.user.get_profile()
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if self.id == None:
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# insert
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profile.balance += self.amount
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else:
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# update
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oldobj = Transaction.objects.get(id=self.id)
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profile.balance += (self.amount-oldobj.amount)
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profile.save()
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super(Transaction, self).save(*args, **kwargs)
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def delete(self, *args, **kwargs):
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profile = self.user.get_profile()
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profile.balance -= self.amount
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profile.save()
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super(Transaction, self).delete(*args, **kwargs)
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class VirtualTransaction(models.Model):
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""" Represents a transaction between two users. """
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user = models.ForeignKey(User, null=True, on_delete=SET_NULL)
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recipient = models.ForeignKey(User, related_name='receivedtransaction', null=True, on_delete=SET_NULL, verbose_name=u'Empfänger')
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dateTime = models.DateTimeField(auto_now_add=True)
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amount = models.DecimalField(max_digits=8, decimal_places=2, validators=[MinValueValidator(Decimal("0.01"))], verbose_name='Betrag')
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comment = models.CharField(max_length=100, verbose_name='Verwendungszweck')
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def __unicode__(self):
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return u"%s ==> %s: %s Euro" % (self.user, self.recipient, self.amount)
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def save(self, *args, **kwargs):
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userProfile = self.user.get_profile()
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recipientProfile = self.recipient.get_profile()
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amount = None
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if self.id == None:
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amount = self.amount
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else:
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oldobj = VirtualTransaction.objects.get(id=self.id)
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amount = self.amount - oldobj.amount
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userProfile.balance -= amount
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recipientProfile.balance += amount
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userProfile.save()
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recipientProfile.save()
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super(VirtualTransaction, self).save(*args, **kwargs)
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@staticmethod
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def pre_delete_signal(sender, instance, **kwargs):
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""" Pre delete signal to ensure consistent balances on object delete. """
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# Only revert if both users exist.
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if instance.user and instance.recipient:
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# revert transaction
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print instance.user
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print dir(instance)
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userProfile = instance.user.get_profile()
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recipientProfile = instance.recipient.get_profile()
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userProfile.balance += instance.amount
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recipientProfile.balance -= instance.amount
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userProfile.save()
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recipientProfile.save()
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pre_delete.connect(VirtualTransaction.pre_delete_signal, sender=VirtualTransaction)
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