class Chat(models.Model):
    name = models.CharField("Названия чата", max_length=250)
    chat_id = models.CharField("ID чата", max_length=50)

    def __str__(self):
        return self.name

    class Meta:
        verbose_name = "Чат"
        verbose_name_plural = "Чаты"


class File(models.Model):
    name = models.CharField("Имя файла", max_length=250)
    file_id = models.CharField("ID файла", max_length=250)
    chat = models.ForeignKey(Chat, max_length=250, on_delete=models.SET_NULL, null=True)

    updated = models.DateTimeField("Дата изменения", default=datetime.datetime.now())
    created = models.DateTimeField("Дата создания", default=datetime.datetime.now())