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#plik models.py

class Player(models.Model):

    name = models.CharField(max_length=30)
    user = models.ForeignKey(User, null=True, blank=True, on_delete=models.SET_NULL)
    # tu jeszcze sporo pól ale dla czytelności nie warto wypisywać
    def __str__(self):
        if self.user is not None:
            return self.name + "(" + self.user + ")"
        return self.name

class Leaderboard(models.Model):

    date_published = models.DateTimeField()
    description = models.TextField(null=True, blank=True)
    scenario = models.ForeignKey(Scenario, null=True, blank=True, on_delete=models.SET_NULL)
    players = models.ManyToManyField(Player, through="PlayerLeaderboard", related_name="Players")

class PlayerLeaderboard(models.Model):

    player = models.ForeignKey(Player, on_delete=models.CASCADE)
    leaderboard = models.ForeignKey(Leaderboard, on_delete=models.CASCADE)
    is_host = models.BooleanField(default=False)

# są jeszcze inne klasy ale nie są one znaczące do pytania