How, when selecting in one select field, filter the values ​​of another in Django admin?

Question

Django

There are several related models, here is an example:

class League(models.Model):
    name = models.CharField(max_length=50)
    ...

class Team(models.Model):
    name = models.CharField(max_length=50)
    league = models.ForeignKey(League)
    ...

class Player(models.Model):
    league = models.ForeignKey(League, blank=True, null=True)
    team = models.ForeignKey(Team, blank=True, null=True)
    ...

Each league includes 16-20 teams. How, on the Player form page in the admin panel, when choosing league in the team field, only teams from the selected league were available?

Answer 1

django-admin-flexselect
Demo video

Answer 2

https://docs.djangoproject.com/en/1.7/ref/contrib/...