django select related select field in template form

[Anuj Sharma]

I'm working in Django 1.11

I have three apps, country, state and address

state model is associated with country by foreign key and address is associated with state with a foreign key.

country/models.py

    class Country(models.Model):
        name = models.CharField(max_length=100)
        code = models.CharField(max_length=50)
   
        class Meta:
            db_table = 'countries'
   
        def __str__(self):
            return self.name

state/models.py

    class State(models.Model):
        country = models.ForeignKey(Country, on_delete=models.CASCADE)
        name = models.CharField(max_length=100)
        code = models.CharField(max_length=50)
   
        class Meta:
            db_table = 'states'
   
        def __str__(self):
            return self.name

address/models.py

    class Address(models.Model):
        line_1 = models.CharField(max_length=200)
        line_2 = models.CharField(max_length=200)
        city = models.CharField(max_length=200)
        state = models.ForeignKey(State, on_delete=models.PROTECT)
        postal_code = models.CharField(max_length=15)
   
        class Meta:
            db_table = 'addresses'
   
        def __str__(self):
            return '%s, %s, %s, %s' % (self.line_1, self.line_2, self.city, self.state)

Since one country can have multiple states, I want user to be able to select state after selecting country, which will list related/associated states while adding/editing address.

I also want this feature in /admin as app is registered to admin too.

Is there any simple and better way to do this?

[Melvyn Sopacua]

http://django-autocomplete-light.readthedocs.io/en/master/tutorial.html#filtering-results-based-on-the-value-of-other-fields-in-the-form

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Melvyn Sopacua