plateforme-corres2math/apps/logs/models.py

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2020-09-21 15:34:27 +00:00
# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later
from django.conf import settings
from django.contrib.contenttypes.models import ContentType
from django.core.exceptions import ValidationError
from django.db import models
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
class Changelog(models.Model):
"""
Store each modification in the database (except sessions and logging),
including creating, editing and deleting models.
"""
user = models.ForeignKey(
settings.AUTH_USER_MODEL,
on_delete=models.PROTECT,
null=True,
verbose_name=_('user'),
)
ip = models.GenericIPAddressField(
null=True,
blank=True,
verbose_name=_("IP Address")
)
model = models.ForeignKey(
ContentType,
on_delete=models.PROTECT,
null=False,
blank=False,
verbose_name=_('model'),
)
instance_pk = models.CharField(
max_length=255,
null=False,
blank=False,
verbose_name=_('identifier'),
)
previous = models.TextField(
blank=True,
default="",
verbose_name=_('previous data'),
)
data = models.TextField(
blank=True,
default="",
verbose_name=_('new data'),
)
action = models.CharField( # create, edit or delete
max_length=16,
null=False,
blank=False,
choices=[
('create', _('create')),
('edit', _('edit')),
('delete', _('delete')),
],
default='edit',
verbose_name=_('action'),
)
timestamp = models.DateTimeField(
null=False,
blank=False,
default=timezone.now,
name='timestamp',
verbose_name=_('timestamp'),
)
def delete(self, using=None, keep_parents=False):
raise ValidationError(_("Logs cannot be destroyed."))
class Meta:
verbose_name = _("changelog")
verbose_name_plural = _("changelogs")
def __str__(self):
return _("Changelog of type \"{action}\" for model {model} at {timestamp}").format(
action=self.get_action_display(), model=str(self.model), timestamp=str(self.timestamp))