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here we go again (better this time)

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quark
2025-04-16 17:26:00 +02:00
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apps/food/models.py
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# Copyright (C) 2018-2025 by BDE ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later
from datetime import timedelta
from django.db import models, transaction
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
from member.models import Club
from polymorphic.models import PolymorphicModel
class QRCode(models.Model):
"""
An QRCode model
"""
qr_code_number = models.PositiveIntegerField(
verbose_name=_("QR-code number"),
unique=True,
)
food_container = models.ForeignKey(
'Food',
on_delete=models.CASCADE,
related_name='QR_code',
verbose_name=_('food container'),
)
class Meta:
verbose_name = _("QR-code")
verbose_name_plural = _("QR-codes")
def __str__(self):
return _("QR-code number {qr_code_number}").format(qr_code_number=self.qr_code_number)
class Allergen(models.Model):
"""
A list of allergen and alimentary restrictions
"""
name = models.CharField(
verbose_name=_('name'),
max_length=255,
)
class Meta:
verbose_name = _('Allergen')
verbose_name_plural = _('Allergens')
def __str__(self):
return self.name
class Food(PolymorphicModel):
name = models.CharField(
verbose_name=_('name'),
max_length=255,
)
owner = models.ForeignKey(
Club,
on_delete=models.PROTECT,
related_name='+',
verbose_name=_('owner'),
)
allergens = models.ManyToManyField(
Allergen,
blank=True,
verbose_name=_('allergen'),
)
expiry_date = models.DateTimeField(
verbose_name=_('expiry date'),
null=False,
)
was_eaten = models.BooleanField(
default=False,
verbose_name=_('was eaten'),
)
# is_ready != is_active : is_ready signifie que la nourriture est prête à être manger,
# is_active signifie que la nourriture n'est pas encore archivé
# il sert dans les cas où il est plus intéressant que de l'open soit conservé (confiture par ex)
is_ready = models.BooleanField(
default=False,
verbose_name=_('is ready'),
)
is_active = models.BooleanField(
default=True,
verbose_name=_('is active'),
)
def __str__(self):
return self.name
@transaction.atomic
def save(self, force_insert=False, force_update=False, using=None, update_fields=None):
return super().save(force_insert, force_update, using, update_fields)
class Meta:
verbose_name = _('food')
verbose_name = _('foods')
class BasicFood(Food):
"""
Food which has been directly buy on supermarket
"""
date_type = models.CharField(
max_length=255,
choices=(
("DLC", "DLC"),
("DDM", "DDM"),
)
)
arrival_date = models.DateTimeField(
verbose_name=_('arrival date'),
default=timezone.now,
)
# label = models.ImageField(
# verbose_name=_('food label'),
# max_length=255,
# blank=False,
# null=False,
# upload_to='label/',
# )
@transaction.atomic
def update_allergens(self):
# update parents
for parent in self.transformed_ingredient_inv.iterator():
parent.update_allergens()
@transaction.atomic
def update_expiry_date(self):
# update parents
for parent in self.transformed_ingredient_inv.iterator():
parent.update_expiry_date()
@transaction.atomic
def update(self):
self.update_allergens()
self.update_expiry_date()
class Meta:
verbose_name = _('Basic food')
verbose_name_plural = _('Basic foods')
class TransformedFood(Food):
"""
Transformed food are a mix between basic food and meal
"""
creation_date = models.DateTimeField(
verbose_name=_('creation date'),
)
ingredient = models.ManyToManyField(
Food,
blank=True,
symmetrical=False,
related_name='transformed_ingredient_inv',
verbose_name=_('transformed ingredient'),
)
# Without microbiological analyzes, the storage time is 3 days
shelf_life = models.DurationField(
verbose_name=_("shelf life"),
default=timedelta(days=3),
)
@transaction.atomic
def archive(self):
# When a meal are archived, if it was eaten, update ingredient fully used for this meal
raise NotImplementedError
@transaction.atomic
def update_allergens(self):
# When allergens are changed, simply update the parents' allergens
old_allergens = list(self.allergens.all())
self.allergens.clear()
for ingredient in self.ingredient.iterator():
self.allergens.set(self.allergens.union(ingredient.allergens.all()))
if old_allergens == list(self.allergens.all()):
return
super().save()
# update parents
for parent in self.transformed_ingredient_inv.iterator():
parent.update_allergens()
@transaction.atomic
def update_expiry_date(self):
# When expiry_date is changed, simply update the parents' expiry_date
old_expiry_date = self.expiry_date
self.expiry_date = self.creation_date + self.shelf_life
for ingredient in self.ingredient.iterator():
self.expiry_date = min(self.expiry_date, ingredient.expiry_date)
if old_expiry_date == self.expiry_date:
return
super().save()
# update parents
for parent in self.transformed_ingredient_inv.iterator():
parent.update_expiry_date()
@transaction.atomic
def update(self):
self.update_allergens()
self.update_expiry_date()
@transaction.atomic
def save(self, *args, **kwargs):
super().save(*args, **kwargs)
class Meta:
verbose_name = _('Transformed food')
verbose_name_plural = _('Transformed foods')