> How can i get the countries that under the certain continent by the
> ForeignKey: continent=models.ForeignKey('Continent')?
If you have a Continent object c:
c.country_set.all() will give the related countries.
--
Gladys
http://bixly.com
On Mar 13, 7:55 pm, yongzhen zhang <4...@live.cn> wrote:
> Hi,
> Anyone can provide the further help? It seems this method has some
> shortage, because the Continent is not related with Country. How can i
> get the countries that under the certain continent by the ForeignKey:
> continent=models.ForeignKey('Continent')?
>
> On Mar 12, 6:50 pm, Ezequiel Marquez <exe.z...@gmail.com> wrote:
>
>
>
>
>
>
>
> > El 12/03/11 13:31, yongzhen zhang escribió:
>
> > > Hi, i want to rendering JSON from Django views, here is my models:
> > > class Continent(models.Model):
> > > name = models.CharField(max_length='10',unique=True)
> > > code = models.CharField(max_length='5',unique=True)
> > > class Country(models.Model):
> > > name = models.CharField(max_length='10',unique=True)
> > > code=models.CharField(max_length='10',unique=True)
> > > continent=models.ForeignKey('Continent')
> > > ###############here is my views.py#######################
> > > from django.http import Http404
> > > from django.shortcuts import render_to_response, get_object_or_404
> > > from django.utils import simplejson as json
> > > from models import Continent, Country
>
> > > def continent_json(request, continent_code):
> > > continent=get_object_or_404(Continent, code=continent_code)
> > > if not continent:
> > > raise Http404("Not implemented")
> > > context = {"all_contries":
> > > Country.objects.filter(continent=continent.id)}
> > > data=json.dumps(context)
> > > return render_to_response(data, mimetype="application/json")
>
> > > I want to get the result when the continent_code=eu:
> > > {
> > > "xk": "Kosovo",
> > > "ch": "Switzerland",
> > > "gr": "Greece",
> > > "va": "Vatican City",
> > > "ee": "Estonia",
> > > "is": "Iceland",
> > > "al": "Albania",
> > > "gg": "Guernsey",
> > > }
> > > There is some problems with my views.py file. Anybody know how to
> > > modify my views.py?
>
> > try with this view
>
> > def continent_json(request, continent_code):
> > continent=get_object_or_404(Continent, code=continent_code)
> > if not continent:
> > raise Http404("Not implemented")
> > context = [{'code': i.code, 'continent': i.name } for i in
> > Country.objects.all() ]
> > data=simplejson.dumps(context)
> > return render_to_response(data, mimetype="application/json")
> > --
> > Ezequiel Marquez
>
> > signature.asc
> > < 1KViewDownload
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