如何从 Django 中的先前视图（CBV）获取对象？

Question

我试图从之前的 DetailView 获取 CreateView 中的对象值。但是失败了。有什么简单的方法可以做到这一点吗？

在这段代码中，如何用 album.pk == id 根据 'item-add'(url(r'^(?P<id>[0-9]+)/pic/add/$', views.ItemCreate.as_view(), name='item-add'))

models.py

class Album(models.Model):
    credit = models.CharField(max_length=250)
    album_title = models.CharField(max_length=100)
    logo = models.FileField()

    def get_absolute_url(self):
        return reverse('picture:detail', kwargs={'pk': self.pk})

    def __str__(self):
        return self.album_title + ' - ' + self.credit


class Item(models.Model):
    album = models.ForeignKey(Album, on_delete=models.CASCADE)
    file_type = models.CharField(choices=TYPE_CHOICES, max_length=1)
    caption = models.CharField(max_length=100)

    class Meta:
        ordering = ('upload_date', 'caption')

    def get_absolute_url(self):
        return reverse('picture:item-detail', kwargs={ 'id': self.album_id , 'pk': self.pk})

    def __str__(self):
        return self.caption

views.py

class DetailView(generic.DetailView):
    model = Album
    template_name = 'picture/detail.html'

class ItemCreate(CreateView):
    model = Item
    fields = ['album', 'file_type', 'caption']

    def get_initial(self):
        album = ???
        return {
            'album': album,
            'file_type': 't',
        }

urls.py

urlpatterns = [
# /picture/<album_id>/
    url(r'^(?P<pk>[0-9]+)/$', views.DetailView.as_view(), name='detail'),
# /picture/<album_id>/<pic_id>
    url(r'^(?P<id>[0-9]+)/(?P<pk>[0-9]+)/$', views.ItemDetailView.as_view(), name='item-detail'),
# /picture/<album_id>/pic/add
    url(r'^(?P<id>[0-9]+)/pic/add/$', views.ItemCreate.as_view(), name='item-add'),
]

Answer 1

主键作为 id URL 参数传递，因此您可以使用 self.kwargs:

访问它

from django.shortcuts import get_object_or_404

class ItemCreate(CreateView):
    model = Item
    fields = ['album', 'file_type', 'caption']

    def get_initial(self):
        album = <b>get_object_or_404(</b>Album<b>, pk=self.kwargs['id'])</b>
        return {
            'album': album,
            'file_type': 't',
        }

如何从 Django 中的先前视图（CBV）获取对象？

How to get object from previous view(CBV) in Django?

python

django

django-class-based-views