nk20/apps/note/models/transactions.py

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# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
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# SPDX-License-Identifier: GPL-3.0-or-later
from django.db import models
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
from django.urls import reverse
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from .notes import Note, NoteClub
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"""
Defines transactions
"""
class TemplateCategory(models.Model):
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"""
Defined a recurrent transaction category
Example: food, softs, ...
"""
name = models.CharField(
verbose_name=_("name"),
max_length=31,
unique=True,
)
class Meta:
verbose_name = _("transaction category")
verbose_name_plural = _("transaction categories")
def __str__(self):
return str(self.name)
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class TransactionTemplate(models.Model):
"""
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Defined a recurrent transaction
associated to selling something (a burger, a beer, ...)
"""
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name = models.CharField(
verbose_name=_('name'),
max_length=255,
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unique=True,
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error_messages={'unique':_("A template with this name already exist")},
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)
destination = models.ForeignKey(
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NoteClub,
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on_delete=models.PROTECT,
related_name='+', # no reverse
verbose_name=_('destination'),
)
amount = models.PositiveIntegerField(
verbose_name=_('amount'),
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help_text=_('in centimes'),
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)
category = models.ForeignKey(
TemplateCategory,
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on_delete=models.PROTECT,
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verbose_name=_('type'),
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max_length=31,
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)
display = models.BooleanField(
default = True,
)
description = models.CharField(
verbose_name=_('description'),
max_length=255,
)
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class Meta:
verbose_name = _("transaction template")
verbose_name_plural = _("transaction templates")
def get_absolute_url(self):
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return reverse('note:template_update', args=(self.pk, ))
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class TransactionType(models.Model):
"""
Defined a recurrent transaction category
Example: food, softs, ...
"""
name = models.CharField(
verbose_name=_("name"),
max_length=31,
unique=True,
)
class Meta:
verbose_name = _("transaction type")
verbose_name_plural = _("transaction types")
def __str__(self):
return str(self.name)
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class Transaction(models.Model):
"""
General transaction between two :model:`note.Note`
amount is store in centimes of currency, making it a positive integer
value. (from someone to someone else)
TODO: Ensure source != destination.
"""
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source = models.ForeignKey(
Note,
on_delete=models.PROTECT,
related_name='+',
verbose_name=_('source'),
)
destination = models.ForeignKey(
Note,
on_delete=models.PROTECT,
related_name='+',
verbose_name=_('destination'),
)
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created_at = models.DateTimeField(
verbose_name=_('created at'),
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default=timezone.now,
)
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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(verbose_name=_('amount'), )
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transaction_type = models.ForeignKey(
TransactionType,
on_delete=models.PROTECT,
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verbose_name=_('type'),
max_length=31,
)
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reason = models.CharField(
verbose_name=_('reason'),
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:
verbose_name = _("transaction")
verbose_name_plural = _("transactions")
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def save(self, *args, **kwargs):
"""
When saving, also transfer money between two notes
"""
created = self.pk is None
to_transfer = self.amount * self.quantity
if not created:
# Revert old transaction
old_transaction = Transaction.objects.get(pk=self.pk)
if old_transaction.valid:
self.source.balance += to_transfer
self.destination.balance -= to_transfer
if self.valid:
self.source.balance -= to_transfer
self.destination.balance += to_transfer
# Save notes
self.source.save()
self.destination.save()
super().save(*args, **kwargs)
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@property
def total(self):
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return self.amount * self.quantity
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class TemplateTransaction(Transaction):
"""
Special type of :model:`note.Transaction` associated to a :model:`note.TransactionTemplate`.
"""
template = models.ForeignKey(
TransactionTemplate,
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null=True,
on_delete=models.SET_NULL,
)
category = models.ForeignKey(
TemplateCategory,
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on_delete=models.PROTECT,
)
name = models.CharField(
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max_length=255,
)
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class MembershipTransaction(Transaction):
"""
Special type of :model:`note.Transaction` associated to a :model:`member.Membership`.
"""
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membership = models.OneToOneField(
'member.Membership',
on_delete=models.PROTECT,
related_name='transaction',
)
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class Meta:
verbose_name = _("membership transaction")
verbose_name_plural = _("membership transactions")