#models.py

class Folder(models.Model):
    """Folder model instance"""
    title = models.CharField(max_length=120, blank=False, null=False, verbose_name="Title")
    period = models.DurationField(blank=False, null=False, verbose_name="Period")
    is_active = models.BooleanField(default=True, verbose_name="Is active")
    created = models.DateTimeField(auto_now_add=True, auto_now=False, verbose_name='Created')
    updated = models.DateTimeField(auto_now_add=False, auto_now=True, verbose_name='Updated')

class GroupFolderMessage(models.Model):
    """Group folder relation model instance"""
    group = models.ForeignKey(Group, on_delete=models.CASCADE, blank=False, null=False, verbose_name="Group")
    folder = models.ForeignKey(Folder, on_delete=models.CASCADE, blank=False, null=False, verbose_name="Folder")
    message = models.ForeignKey(Message, on_delete=models.CASCADE, blank=False, null=False, verbose_name="Message")
    is_active = models.BooleanField(default=True, verbose_name="Is active")
    created = models.DateTimeField(auto_now_add=True, auto_now=False, verbose_name='Created')
    updated = models.DateTimeField(auto_now_add=False, auto_now=True, verbose_name='Updated')

    #@receiver(models.signals.post_save, sender=GroupFolderMessage)
    #def execute_after_save(sender, instance, created, *args, **kwargs):
        #if created:
            #start_folder.delay(instance.id)



#admin.py

class GroupFolderInline(admin.TabularInline):
    model = GroupFolderMessage
    extra = 0


class FolderAdmin(admin.ModelAdmin):
    list_display = ['title', 'period', 'is_active', 'created', 'updated']
    inlines = [GroupFolderInline]

    class Meta:
        model = Folder

admin.site.register(Folder, FolderAdmin)