Django CreateView customise form default field based on url parameter

Question

file: Capacity/models.py

class Env(models.Model):
    name = models.CharField(max_length=50)
    def get_absolute_url(self):
            return reverse('index')

class Envhosts(models.Model):
    env =  models.ForeignKey(Env)
    hostname = models.CharField(max_length=50)
    count = models.IntegerField()

    class Meta:
        unique_together = ("env","hostname")

    def get_absolute_url(self):
        return reverse('index')

file: Capacity/views.py

 class EnvhostsCreate(CreateView):
    model = Capacity.models.Envhosts
    fields=['env','hostname','count']
    template_name_suffix = '_create_form'

file Capacity/urls.py:

urlpatterns = patterns(........ url(r'^createhosts/(?P<envid>\d+)/$',EnvhostsCreate.as_view(),name='envhosts_create'))

So now, when i open this form: /Capacity/createhosts/3/ (where 3 is my env id) It shows an option of env objects as a drop down list based on the number of object of Env. But i want it to take the env on its own based on the env id ('3' in this case)

I know i have to override some method in class EnvhostsCreate(CreateView). But i m unable to figure out which method and how to take the env based on the part after /createhosts/

score 4 · Accepted Answer · answered Dec 06 '13 at 10:16

4

You can use the pattern described in the documentation for adding request.user - it's the same principle. Remove env from the fields list, then define form_valid():

class EnvhostsCreate(CreateView):
    model = Capacity.models.Envhosts
    fields = ['hostname', 'count']
    template_name_suffix = '_create_form'

    def form_valid(self, form):
        form.instance.env = Envhosts.objects.get(pk=self.kwargs['envid'])
        return super(EnvhostsCreate, self).form_valid(form)

answered Dec 06 '13 at 10:16

Daniel Roseman

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Works perfectly. Had to format a little form.instance.env = Env.objects.get(pk=self.kwargs['envid']) (since its a foriegn key for Env class) – Ashwin Sethi Dec 06 '13 at 12:11
To set a default value but still let the user decide, [`get_initial`](http://stackoverflow.com/questions/13180116/how-do-i-set-initial-data-on-a-django-class-based-generic-createview-with-reques) might be a good alternative. – jozxyqk Apr 04 '17 at 18:57
here's the link for [Django 4.6](https://docs.djangoproject.com/en/4.2/topics/class-based-views/generic-editing/#models-and-request-user) – Mario Rojas May 03 '23 at 22:13

Django CreateView customise form default field based on url parameter

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