mirror of
https://gitlab.crans.org/bde/nk20
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148 lines
3.7 KiB
Python
148 lines
3.7 KiB
Python
# -*- mode: python; coding: utf-8 -*-
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# Copyright (C) 2018-2019 by BDE ENS Paris-Saclay
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# SPDX-License-Identifier: GPL-3.0-or-later
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from django.db import models
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from django.utils import timezone
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from django.utils.translation import gettext_lazy as _
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from django.urls import reverse
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from .notes import Note,NoteClub
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"""
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Defines transactions
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"""
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class TransactionTemplate(models.Model):
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"""
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Defined a reccurent transaction
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associated to selling something (a burger, a beer, ...)
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"""
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name = models.CharField(
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verbose_name=_('name'),
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max_length=255,
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unique=True,
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)
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destination = models.ForeignKey(
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NoteClub,
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on_delete=models.PROTECT,
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related_name='+', # no reverse
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verbose_name=_('destination'),
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)
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amount = models.PositiveIntegerField(
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verbose_name=_('amount'),
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help_text=_('in centimes'),
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)
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template_type = models.CharField(
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verbose_name=_('type'),
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max_length=31
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)
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description = models.CharField(
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verbose_name=_('description'),
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max_length=255,
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)
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class Meta:
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verbose_name = _("transaction template")
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verbose_name_plural = _("transaction templates")
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def get_absolute_url(self):
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return reverse('note:template_update',args=(self.pk,))
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class Transaction(models.Model):
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"""
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General transaction between two :model:`note.Note`
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amount is store in centimes of currency, making it a positive integer
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value. (from someone to someone else)
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TODO: Ensure source != destination.
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"""
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source = models.ForeignKey(
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Note,
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on_delete=models.PROTECT,
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related_name='+',
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verbose_name=_('source'),
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)
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destination = models.ForeignKey(
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Note,
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on_delete=models.PROTECT,
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related_name='+',
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verbose_name=_('destination'),
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)
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created_at = models.DateTimeField(
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verbose_name=_('created at'),
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default=timezone.now,
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)
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quantity = models.PositiveIntegerField(
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verbose_name=_('quantity'),
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default=1,
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)
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amount = models.PositiveIntegerField(
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verbose_name=_('amount'),
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)
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transaction_type = models.CharField(
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verbose_name=_('type'),
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max_length=31,
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)
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reason = models.CharField(
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verbose_name=_('reason'),
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max_length=255,
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)
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valid = models.BooleanField(
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verbose_name=_('valid'),
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default=True,
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)
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class Meta:
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verbose_name = _("transaction")
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verbose_name_plural = _("transactions")
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def save(self, *args, **kwargs):
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"""
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When saving, also transfer money between two notes
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"""
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created = self.pk is None
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to_transfer = self.amount * self.quantity
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if not created:
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# Revert old transaction
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old_transaction = Transaction.objects.get(pk=self.pk)
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if old_transaction.valid:
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self.source.balance += to_transfer
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self.destination.balance -= to_transfer
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if self.valid:
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self.source.balance -= to_transfer
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self.destination.balance += to_transfer
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# Save notes
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self.source.save()
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self.destination.save()
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super().save(*args, **kwargs)
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@property
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def total(self):
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return self.amount*self.quantity
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class MembershipTransaction(Transaction):
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"""
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Special type of :model:`note.Transaction` associated to a :model:`member.Membership`.
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"""
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membership = models.OneToOneField(
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'member.Membership',
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on_delete=models.PROTECT,
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related_name='transaction',
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)
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class Meta:
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verbose_name = _("membership transaction")
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verbose_name_plural = _("membership transactions")
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