Added very basic Tastypie API, and dynamic forms for Country/County.

app/stores/api.py

@@ -0,0 +1,18 @@
+from django.forms.models import model_to_dict
+from tastypie.resources import ModelResource, ALL, ALL_WITH_RELATIONS
+from stores.models import County, Country
+
+
+class CountryResource(ModelResource):
+
+    def dehydrate(self, bundle):
+        counties = County.objects.filter(country=bundle.data['id'])
+        bundle.data['counties'] = [model_to_dict(c) for c in counties]
+        return bundle
+
+    class Meta:
+        queryset = Country.objects.all()
+        resource_name = 'country'
+        filtering = {
+            'id': ('exact',)
+        }

app/stores/templates/stores/wizard/store_wizard.html

@@ -9,6 +9,25 @@
 {% block scripts %}
     <script type="text/javascript" src="https://maps.google.com/maps/api/js?sensor=false"></script>
     <script type="text/javascript" src="{% static "js/geocoder.js" %}"></script>
+    <script type="text/javascript">
+        $(document).ready(function() {
+            $('select#id_0-county').html('').prop('disabled', 'disabled');
+            $('select#id_0-country').change(function(){
+                var country_id = $("select#id_0-country option:selected").val();
+                var url = '{%  url 'api_dispatch_list' resource_name='country' api_name='1.0' %}' + country_id + "/";
+                $('select#id_0-county').html('').prop('disabled', 'disabled');
+                $.getJSON(url, function(data) {
+                    if (data.counties.length > 0) {
+                        $(data.counties).each(function () {
+                            $('select#id_0-county').append($('<option/>').val(this.id).text(this.name));
+                        });
+                        $('select#id_0-county').change();
+                        $('select#id_0-county').prop('disabled', false);
+                    }
+                })
+            })
+        });
+    </script>
 {% endblock %}
 
 {% block content %}