如何让两个模型互相引用Django

I have the following code:

我有以下代码：

class Game(models.Model):
    title = models.CharField(max_length=50)
    summery = models.CharField(max_length=500)
    key = models.IntegerField()
    pin = models.CharField(max_length=12)
    complete = models.BooleanField()
    invite_sent = models.DateTimeField()
    on = models.ForeignKey(Member, blank = True) #<----


class Member(models.Model):
    email = models.CharField(max_length=100)
    color = models.CharField(max_length=11)
    game = models.ForeignKey(Game) #<----
class Ga