Move apps in main directory

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

logs/models.py

@@ -0,0 +1,88 @@
+# 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))