Django：在基於類的視圖和表單中訪問URL變量

Question

我想在使用基於標準類的視圖和表單庫的Django中創建一個對象。我的表單中的三個字段依賴於從URL模式捕獲的域變量。我的問題是：

• 如何訪問domain內CreateSubscription，這樣我可以設置Subscription.site到Site.objects.filter(domain=domain)[0]？
• 如何限制從CreateSubscriptionForm呈現的下拉字段，以便​​僅顯示SubscriptionPlan.objects.filter(site=Site.objects.filter(domain=domain)[0])而payment_profile僅限於PaymentProfile.objects.filter(user=request.user)？

爲了清晰起見，r'^subscribe/(?P<domain>\w+\.\w+)/$'中的域與我自己網站的域無關。 django.contrib.sites框架不會幫助我在這裏。

在此先感謝您幫助我解開所有這些CBV方法。 :)

URL模式是：

from django.conf.urls import patterns, url 
from accounts.views import * 

url(r'^subscribe/(?P<domain>\w+\.\w+)/$', 
    CreateSubscription.as_view(), name='subscribe_to_site'), 
) 

有問題的看法是：

from accounts.forms import * 
from accounts.models import * 

class CreateSubscription(CreateView): 
    model = Subscription 
    form_class = CreateSubscriptionForm 

    def form_valid(self, form): 
     form.instance.user = self.request.user 
     return super(CreateSubscription, self).form_valid(form) 

相關型號有：

from django.conf import settings 
from django.contrib.sites.models import Site 
from django.db import models 

class PaymentProfile(models.Model): 
    user = models.ForeignKey(settings.AUTH_USER_MODEL) 

class SubscriptionPlan(models.Model): 
    site = models.ForeignKey(Site) 
    name = models.CharField(max_length=40) 

class Subscription(models.Model): 
    user = models.ForeignKey(settings.AUTH_USER_MODEL) 
    site = models.ForeignKey(Site) 
    plan = models.ForeignKey(SubscriptionPlan) 
    payment_profile = models.ForeignKey(PaymentProfile) 

最後，我的形式是：

from accounts.models import * 

class CreateSubscriptionForm(forms.ModelForm): 
    class Meta: 
     model = Subscription 
     exclude = ('user', 'site',) 

Answer 1

來訪問傳遞給視圖中的數據，使用self.args和self.kwargs

from accounts.forms import * 
from accounts.models import * 

class CreateSubscription(CreateView): 
    model = Subscription 
    form_class = CreateSubscriptionForm 

    def form_valid(self, form): 
     form.instance.user = self.request.user 
     form.instance.site = Site.objects.get(domain=self.kwargs['domain']) 
     return super(CreateSubscription, self).form_valid(form) 

要限制下拉菜單內容，你需要設置queryset這些字段。基本上，沿着這些線：

class CreateSubscriptionForm(forms.ModelForm): 
    plan = forms.ModelChoiceField(
     queryset=SubscriptionPlan.objects.filter(xxx) 
    ) 

    ... 

    class Meta: 
     model = Subscription 
     exclude = ('user', 'site',) 

這也可以在視圖內完成，以便您有權訪問該域。

class CreateSubscription(CreateView): 
    model = Subscription 
    form_class = CreateSubscriptionForm 

    def get_form(self, form_class): 
     """ 
     Returns an instance of the form to be used in this view. 
     """ 
     form = super(CreateSubscription, self).get_form(form_class) 
     form.fields['plan'].queryset = SubscriptionPlan.objects.filter(site__domain=self.kwargs['domain']) 
     return form 

    ... 

    def form_valid(self, form): 
     form.instance.user = self.request.user 
     form.instance.site = Site.objects.get(domain=self.kwargs['domain']) 
     return super(CreateSubscription, self).form_valid(form)