问从Django中的url参数初始化表单输入字段

EN

#models.py
class Image(models.Model):  
    title = models.CharField(max_length=200)
    description = models.TextField(blank=True)
    url = models.URLField()
    (...)

#views.py
def image_create(request):
    if request.method == 'POST':
        form = ImageCreateForm(data=request.POST)
        (...)
    else:
        form = ImageCreateForm(data=request.GET)
    return render(request,
              'create.html',
              {'form': form})
#forms.py
class ImageCreateForm(forms.ModelForm):
    class Meta:
        model = Image
        fields = ('title', 'url', 'description')
        widgets = {
            'url': forms.HiddenInput,
        }
#create.html
{% extends "base.html" %}
{% block content %}
<h1>Bookmark an image</h1>
<img src="{{ request.GET.url }}" class="image-preview">
<form action="." method="post">
    {{ form.as_p }}
    {% csrf_token %}
    <input type="submit" value="Bookmark it!">
</form>
{% endblock content %}