96 lines
3.4 KiB
Python
96 lines
3.4 KiB
Python
from django.utils import timezone
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from django.db import models
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from django.conf import settings
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from django.utils.translation import gettext_lazy as _
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class TrackableModel(models.Model):
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created_at = models.DateTimeField(auto_now_add=True, verbose_name=_("créé le"))
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created_by = models.ForeignKey(
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settings.AUTH_USER_MODEL,
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null=True,
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blank=True,
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on_delete=models.PROTECT,
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related_name="+",
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verbose_name=_("créé par"),
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)
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updated_at = models.DateTimeField(auto_now=True, verbose_name=_("modifié le"))
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updated_by = models.ForeignKey(
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settings.AUTH_USER_MODEL,
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null=True,
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blank=True,
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on_delete=models.PROTECT,
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related_name="+",
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verbose_name=_("modifié par"),
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)
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obsolete = models.BooleanField(default=False, verbose_name=_("obsolète"))
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obsolete_at = models.DateTimeField(
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null=True, blank=True, verbose_name=_("obsolète le")
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)
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class Meta:
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abstract = True
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def soft_delete(self, cascade_m2m=True):
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"""
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Soft delete of trackable models. Objct becomes obsolete and obsolescence date is indicated.
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"""
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if cascade_m2m:
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self._cascade_soft_delete_m2m()
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self.obsolete = True
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self.obsolete_at = timezone.now()
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self.save(update_fields=["obsolete", "obsolete_at"])
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def _cascade_soft_delete_m2m(self):
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"""
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Propagation of soft delete to M2M fields.
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"""
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for field in self._meta.get_fields():
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if field.many_to_many and not field.auto_created:
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through_model = field.remote_field.through
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if issubclass(through_model, TrackableModel):
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field_name = None
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for through_field in through_model._meta.get_fields():
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if through_field.related_model == self.__class__:
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field_name = through_field.name
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break
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if field_name:
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filter_kwargs = {field_name: self}
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for relation in through_model.objects.filter(
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**filter_kwargs, obsolete=False
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):
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relation.soft_delete(cascade_m2m=False)
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def restore(self, cascade_m2m=True):
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"""
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Restore an object that was soft deleted.
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"""
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if cascade_m2m:
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self._cascade_restore_m2m()
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self.obsolete = False
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self.obsolete_at = None
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self.save(update_fields=["obsolete", "obsolete_at"])
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def _cascade_restore_m2m(self):
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for field in self._meta.get_fields():
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if field.many_to_many and not field.auto_created:
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through_model = field.remote_field.through
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if issubclass(through_model, TrackableModel):
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field_name = None
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for through_field in through_model._meta.get_fields():
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if through_field.related_model == self.__class__:
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field_name = through_field.name
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break
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if field_name:
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filter_kwargs = {field_name: self}
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for relation in through_model.objects.filter(
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**filter_kwargs, obsolete=True
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):
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relation.restore(cascade_m2m=False)
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