Django dependent select

Question

I know that there is a lot of answers on this question, but i am new in Django and i dont know how to implement these solutions. First what i want to do. This is my models:<

Answer 1

well , i coded a whole project just for you , hope this could help :) :
in this project i we have countries which have many cities
as shown in pictures, each time you select a country , only related cities shown in next combo box :)

ok , no let's see the code
(full project source code is on my github : https://github.com/nodet07/Django-Related-DropDowns)
models.py :
just 2 simple models , a country which can have many cities !

 from django.db import models
    class City(models.Model):
        name = models.CharField(max_length=50)
        country = models.ForeignKey("Country")
        def __unicode__(self):
            return u'%s' % (self.name)

    class Country(models.Model):
        name = models.CharField(max_length=50)
        def __unicode__(self):
            return u'%s' % (self.name)

views.py:

from django.shortcuts import render
from map.models import *
from django.utils import simplejson
from django.http import HttpResponse

def index(request):
    countries = Country.objects.all()
    print countries
    return render(request, 'index.html', {'countries': countries})

def getdetails(request):
    #country_name = request.POST['country_name']
    country_name = request.GET['cnt']
    print "ajax country_name ", country_name

    result_set = []
    all_cities = []
    answer = str(country_name[1:-1])
    selected_country = Country.objects.get(name=answer)
    print "selected country name ", selected_country
    all_cities = selected_country.city_set.all()
    for city in all_cities:
        print "city name", city.name
        result_set.append({'name': city.name})
    return HttpResponse(simplejson.dumps(result_set), mimetype='application/json',     content_type='application/json')

index.html :

    
    
    
        
    

    
        
        {% for item in countries %}
             {{ item.name }}     
        {% endfor %}