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https://gitlab.crans.org/bde/nk20
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353 lines
10 KiB
Python
353 lines
10 KiB
Python
# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
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# SPDX-License-Identifier: GPL-3.0-or-later
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from django.core.exceptions import ValidationError
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from django.db import models, transaction
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from django.urls import reverse
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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 polymorphic.models import PolymorphicModel
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from .notes import Note, NoteClub, NoteSpecial
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from ..templatetags.pretty_money import pretty_money
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"""
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Defines transactions
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"""
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class TemplateCategory(models.Model):
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"""
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Defined a recurrent transaction category
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Example: food, softs, ...
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"""
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name = models.CharField(
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verbose_name=_("name"),
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max_length=31,
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unique=True,
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)
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class Meta:
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verbose_name = _("transaction category")
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verbose_name_plural = _("transaction categories")
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def __str__(self):
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return str(self.name)
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class TransactionTemplate(models.Model):
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"""
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Defined a recurrent 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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error_messages={'unique': _("A template with this name already exist")},
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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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)
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category = models.ForeignKey(
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TemplateCategory,
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on_delete=models.PROTECT,
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related_name='templates',
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verbose_name=_('type'),
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max_length=31,
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)
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display = models.BooleanField(
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default=True,
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verbose_name=_("display"),
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)
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highlighted = models.BooleanField(
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default=False,
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verbose_name=_("highlighted"),
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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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blank=True,
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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(PolymorphicModel):
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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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"""
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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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source_alias = models.CharField(
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max_length=255,
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default="", # Will be remplaced by the name of the note on save
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verbose_name=_('used alias'),
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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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destination_alias = models.CharField(
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max_length=255,
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default="", # Will be remplaced by the name of the note on save
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verbose_name=_('used alias'),
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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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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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invalidity_reason = models.CharField(
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verbose_name=_('invalidity reason'),
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max_length=255,
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default=None,
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null=True,
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blank=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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indexes = [
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models.Index(fields=['created_at']),
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models.Index(fields=['source']),
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models.Index(fields=['destination']),
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]
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def validate(self):
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previous_source_balance = self.source.balance
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previous_dest_balance = self.destination.balance
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source_balance = self.source.balance
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dest_balance = self.destination.balance
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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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# Check that nothing important changed
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for field_name in ["source_id", "destination_id", "quantity", "amount"]:
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if getattr(self, field_name) != getattr(old_transaction, field_name):
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raise ValidationError(_("You can't update the {field} on a Transaction. "
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"Please invalidate it and create one other.").format(field=field_name))
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if old_transaction.valid == self.valid:
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# Don't change anything
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return 0, 0
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if old_transaction.valid:
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source_balance += to_transfer
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dest_balance -= to_transfer
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if self.valid:
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source_balance -= to_transfer
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dest_balance += to_transfer
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# When a transaction is declared valid, we ensure that the invalidity reason is null, if it was
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# previously invalid
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self.invalidity_reason = None
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if source_balance > 9223372036854775807 or source_balance < -9223372036854775808\
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or dest_balance > 9223372036854775807 or dest_balance < -9223372036854775808:
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raise ValidationError(_("The note balances must be between - 92 233 720 368 547 758.08 € "
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"and 92 233 720 368 547 758.07 €."))
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return source_balance - previous_source_balance, dest_balance - previous_dest_balance
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@transaction.atomic
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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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if self.source.pk == self.destination.pk:
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# When source == destination, no money is transferred and no transaction is created
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return
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# We refresh the notes with the "select for update" tag to avoid concurrency issues
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self.source = Note.objects.filter(pk=self.source_id).select_for_update().get()
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self.destination = Note.objects.filter(pk=self.destination_id).select_for_update().get()
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# Check that the amounts stay between big integer bounds
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diff_source, diff_dest = self.validate()
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if not self.source.is_active or not self.destination.is_active:
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if 'force_insert' not in kwargs or not kwargs['force_insert']:
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if 'force_update' not in kwargs or not kwargs['force_update']:
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raise ValidationError(_("The transaction can't be saved since the source note "
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"or the destination note is not active."))
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# If the aliases are not entered, we assume that the used alias is the name of the note
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if not self.source_alias:
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self.source_alias = str(self.source)
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if not self.destination_alias:
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self.destination_alias = str(self.destination)
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# We save first the transaction, in case of the user has no right to transfer money
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super().save(*args, **kwargs)
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# Save notes
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self.source.balance += diff_source
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self.source._force_save = True
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self.source.save()
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self.destination.balance += diff_dest
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self.destination._force_save = True
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self.destination.save()
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def delete(self, **kwargs):
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"""
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Whenever we want to delete a transaction (caution with this), we ensure the transaction is invalid first.
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"""
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self.valid = False
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self.save(**kwargs)
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super().delete(**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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@property
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def type(self):
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return _('Transfer')
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def __str__(self):
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return self.__class__.__name__ + " from " + str(self.source) + " to " + str(self.destination) + " of "\
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+ pretty_money(self.quantity * self.amount) + ("" if self.valid else " invalid")
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class RecurrentTransaction(Transaction):
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"""
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Special type of :model:`note.Transaction` associated to a :model:`note.TransactionTemplate`.
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"""
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template = models.ForeignKey(
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TransactionTemplate,
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on_delete=models.PROTECT,
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)
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category = models.ForeignKey(
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TemplateCategory,
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on_delete=models.PROTECT,
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)
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@property
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def type(self):
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return _('Template')
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class Meta:
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verbose_name = _("recurrent transaction")
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verbose_name_plural = _("recurrent transactions")
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class SpecialTransaction(Transaction):
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"""
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Special type of :model:`note.Transaction` associated to transactions with special notes
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"""
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last_name = models.CharField(
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max_length=255,
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verbose_name=_("name"),
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)
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first_name = models.CharField(
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max_length=255,
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verbose_name=_("first_name"),
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)
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bank = models.CharField(
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max_length=255,
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verbose_name=_("bank"),
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blank=True,
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)
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@property
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def type(self):
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return _('Credit') if isinstance(self.source, NoteSpecial) else _("Debit")
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def is_credit(self):
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return isinstance(self.source, NoteSpecial)
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def is_debit(self):
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return isinstance(self.destination, NoteSpecial)
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def clean(self):
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# SpecialTransaction are only possible with NoteSpecial object
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if self.is_credit() == self.is_debit():
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raise(ValidationError(_("A special transaction is only possible between a"
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" Note associated to a payment method and a User or a Club")))
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class Meta:
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verbose_name = _("Special transaction")
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verbose_name_plural = _("Special transactions")
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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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@property
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def type(self):
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return _('membership transaction')
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