nk20/apps/treasury/models.py

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# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
# 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
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from django.db.models import Q
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from django.utils.translation import gettext_lazy as _
from note.models import NoteSpecial, SpecialTransaction
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class Invoice(models.Model):
"""
An invoice model that can generate a true invoice
"""
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id = models.PositiveIntegerField(
primary_key=True,
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verbose_name=_("Invoice identifier"),
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)
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bde = models.CharField(
max_length=32,
default='Saperlistpopette.png',
choices=(
('Saperlistpopette.png', 'Saper[list]popette'),
('Finalist.png', 'Fina[list]'),
('Listorique.png', '[List]orique'),
('Satellist.png', 'Satel[list]'),
('Monopolist.png', 'Monopo[list]'),
('Kataclist.png', 'Katac[list]'),
),
verbose_name=_("BDE"),
)
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object = models.CharField(
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max_length=255,
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verbose_name=_("Object"),
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)
description = models.TextField(
verbose_name=_("Description")
)
name = models.CharField(
max_length=255,
verbose_name=_("Name"),
)
address = models.TextField(
verbose_name=_("Address"),
)
date = models.DateField(
auto_now_add=True,
verbose_name=_("Place"),
)
acquitted = models.BooleanField(
verbose_name=_("Acquitted"),
)
class Product(models.Model):
"""
Product that appear on an invoice.
"""
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invoice = models.ForeignKey(
Invoice,
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on_delete=models.PROTECT,
)
designation = models.CharField(
max_length=255,
verbose_name=_("Designation"),
)
quantity = models.PositiveIntegerField(
verbose_name=_("Quantity")
)
amount = models.PositiveIntegerField(
verbose_name=_("Unit price")
)
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@property
def amount_euros(self):
return self.amount / 100
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@property
def total(self):
return self.quantity * self.amount
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@property
def total_euros(self):
return self.total / 100
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class Remittance(models.Model):
"""
Treasurers want to regroup checks or bank transfers in bank remittances.
"""
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date = models.DateTimeField(
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auto_now_add=True,
verbose_name=_("Date"),
)
type = models.ForeignKey(
NoteSpecial,
on_delete=models.PROTECT,
verbose_name=_("Type"),
)
comment = models.CharField(
max_length=255,
verbose_name=_("Comment"),
)
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closed = models.BooleanField(
default=False,
verbose_name=_("Closed"),
)
@property
def transactions(self):
return SpecialTransaction.objects.filter(specialtransactionproxy__remittance=self)
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@property
def size(self):
return self.transactions.count()
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@property
def amount(self):
return sum(transaction.total for transaction in self.transactions.all())
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def full_clean(self, exclude=None, validate_unique=True):
ret = super().full_clean(exclude, validate_unique)
if self.transactions.filter(~Q(source=self.type)).exists():
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raise ValidationError("All transactions in a remittance must have the same type")
return ret
class SpecialTransactionProxy(models.Model):
"""
In order to keep modularity, we don't that the Note app depends on the treasury app.
That's why we create a proxy in this app, to link special transactions and remittances.
If it isn't very clean, that makes what we want.
"""
transaction = models.OneToOneField(
SpecialTransaction,
on_delete=models.CASCADE,
)
remittance = models.ForeignKey(
Remittance,
on_delete=models.PROTECT,
null=True,
verbose_name=_("Remittance"),
)