Related foreign fields in admin application

[Krassimir Grozdanov]

I am a python and Django novice so please excuse me if my question is
too stupid.

I have 3 models: Regions, Municipalities  and Persons.
In the admin interface, when editing the Person object, I want to
limit the choices for the Municipalities based on the Region choice
(e.g. I want to limit the list only to Municipalities that are in the
chosen region). Please advice me which is the best way to do that.

Here follow my models:

class Region(models.Model):
    region = models.CharField(maxlength=128)

    def __str__(self):
        return self.region
    class Meta:
        verbose_name = 'Област'
        verbose_name_plural = 'Области'
    class Admin:
        pass

class Municipality(models.Model):
    region = models.ForeignKey(Region)
    municipality = models.CharField(maxlength=128)

    def __str__(self):
        return self.municipality
    class Meta:
        verbose_name = 'Община'
        verbose_name_plural = 'Общини'
    class Admin:
        pass

class Person(models.Model):
    PERSON_TYPES = (
        ('Да', 'Юридическо лице'),
        ('Не', 'Физическо лице')
    )
    region = models.ForeignKey(Region, null = True)
    municipality = models.ForeignKey(Municipality, null = True)
    name = models.CharField(maxlength=384)
    type = models.CharField("Юридическо лице", maxlength=8, choices =
PERSON_TYPES, default = 'Да', radio_admin = True)
    dnomer = models.CharField(maxlength=16, blank = True)
    bulstat = models.CharField('БУЛСТАТ', maxlength=16, blank = True)
    egn = models.CharField('ЕГН', maxlength=10, blank = True)
    city = models.CharField(maxlength=64)
    postcode_p = models.CharField(maxlength=16, blank = True)
    address_p = models.CharField(maxlength=128, blank = True)
    phone_p = models.CharField(maxlength=64, blank = True)

    def __str__(self):
        return self.name
    class Meta:
        verbose_name = 'Юридическо лице'
        verbose_name_plural = 'Юридически лица'
    class Admin:
        pass

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