Initializing a django modelform with data from url

开发者_JAVA技巧I have two models for store and city:

class City(models.Model):
    name = models.CharField()
    slug = models.SlugField()


class Store(models.Model):
    name = models.CharField()
    slug = models.SlugField()
    city = models.ForeignKey(City)

If I have my Add Store url designed as

r^'mysite.com/city/(?[-\w]+)/venue/add$'

where the represents the City.slug field can I initialize a StoreForm that automatically populates the Store.city field from the url data?

In your template, define your link as follows.

{%url somename relevant_slug_text%}

Or :

href='/mysite.com/city/{{slug_text}}/venue/add'

In your url conf, define your url like:

url(r^'mysite.com/city/(?P<slug_text>\w+)/venue/add$', 'func_name', name='somename')

So, you can pass the value of relelvant_slug_text variable to your url as slug_text, and in your function definiton:

def func_name(request, slug_text):

So , you can pass text value to your funcrtion with slug_text parameter...

EDIT: There are tow ways...

One:

Crete your city selection form using ModelForm..., then inthe second step, use posted data to populate your form again like:

form = StoreForm(request.POST)

then you can render this form to your template...

But if it is not possible o use this, yo ucan do the following...

Since you are using ModelForm to create your forms:

class StoreForm(forms.ModelForm):
    # your form field definitions are here

im your function, just override city field, but at this point, since you use modelform, your form thml will be created as

<select>
    <option value="id of record">"unicode value of record"</option>

So, you have record id's as option values. And you have slug_field values to initialize your field. So you have to get related city to use it...

my_city = City.objects.get(slug=<your_slug_value>)

Now you can override the form, but you must do it before you pass your form to a variable to render to your template...

StoreForm.base_fields['city'] = forms.ModelChoiceField(queryset=City.objects.all(), initial=my_city)
form = StoreForm()