Django错误：位于/link/“LinkForm”对象的AttributeError没有属性“url”

Question

我想完成的是从url获取图像并创建缩略图。但是 我一直遇到这个错误：AttributeError at/link/'LinkForm'对象没有属性'url'我不知道如何修复这个问题。我是django和python的新手。在

在模型.py在

def upload_location(instance, filename):
    return('{}/{}').format(instance.id, filename)

class Link(models.Model):
    title = models.CharField("Headline", max_length=100)
    submitter = models.ForeignKey(settings.AUTH_USER_MODEL)
    submitted_on = models.DateTimeField(auto_now_add=True)
    rank_score = models.FloatField(default=0.0)
    url = models.URLField("URL", max_length=250, unique=True)
    description = models.TextField(blank=True)
    slug = models.SlugField(unique=True)
    image_file = models.ImageField(upload_to=upload_location, blank=True)
    with_votes = LinkVoteCountManager()
    objects = models.Manager()

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('link:link_detail', kwargs={"slug": self.slug,
                                                   'pk': str(self.id)
                                                   })
def get_remote_image(self):
    if self.url and not self.image_file:
        result = urllib.request.urlretrieve(self.url)
        self.image_file.save(
                os.path.basename(self.url),
                File(open(result[0]))
                )
        self.save()

在视图.py在

^{pr2}$

在表单.py在

from django import forms
from .models import Link
import requests

class LinkForm(forms.ModelForm):
    url = forms.URLField()
    img = forms.ImageField(required=False)

    class Meta:
        model = Link
        exclude = ('submitter', 'rank_score')
        fields = [
            'title',
            'url',
            'description'
        ]

Answer 1

您应该通过form.instance访问表单：

res = requests.get(form.instance.url, stream=True)