Misago/misago/models/checkpointmodel.py

from django.db import models
from misago.signals import (merge_post, merge_thread, move_forum_content,
                            move_post, move_thread, rename_forum, rename_user)

class Checkpoint(models.Model):
    forum = models.ForeignKey('Forum')
    thread = models.ForeignKey('Thread')
    action = models.CharField(max_length=255)
    extra = models.CharField(max_length=255, null=True, blank=True)
    user = models.ForeignKey('User', null=True, blank=True, on_delete=models.SET_NULL)
    user_name = models.CharField(max_length=255)
    user_slug = models.CharField(max_length=255)
    target_user = models.ForeignKey('User', null=True, blank=True, on_delete=models.SET_NULL, related_name='+')
    target_user_name = models.CharField(max_length=255, null=True, blank=True)
    target_user_slug = models.CharField(max_length=255, null=True, blank=True)
    old_forum = models.ForeignKey('Forum', null=True, blank=True, related_name='+')
    old_forum_name = models.CharField(max_length=255, null=True, blank=True)
    old_forum_slug = models.CharField(max_length=255, null=True, blank=True)
    date = models.DateTimeField()
    ip = models.GenericIPAddressField()
    agent = models.CharField(max_length=255)
    deleted = models.BooleanField(default=False)

    class Meta:
        app_label = 'misago'


def rename_forum_handler(sender, **kwargs):
    Checkpoint.objects.filter(old_forum=sender).update(
                                                       old_forum_name=sender.name,
                                                       old_forum_slug=sender.slug,
                                                       )

rename_forum.connect(rename_forum_handler, dispatch_uid="rename_forum_checkpoints")


def rename_user_handler(sender, **kwargs):
    Checkpoint.objects.filter(user=sender).update(
                                                  user_name=sender.username,
                                                  user_slug=sender.username_slug,
                                                  )

rename_user.connect(rename_user_handler, dispatch_uid="rename_user_checkpoints")


def move_forum_content_handler(sender, **kwargs):
    Checkpoint.objects.filter(forum=sender).update(forum=kwargs['move_to'])

move_forum_content.connect(move_forum_content_handler, dispatch_uid="move_forum_checkpoints")


def move_thread_handler(sender, **kwargs):
    Checkpoint.objects.filter(thread=sender).update(forum=kwargs['move_to'])

move_thread.connect(move_thread_handler, dispatch_uid="move_thread_checkpoints")


def merge_thread_handler(sender, **kwargs):
    Checkpoint.objects.filter(thread=sender).delete()

merge_thread.connect(merge_thread_handler, dispatch_uid="merge_threads_checkpoints")