如何将视图中的参数传递到Django的modelForm中？

Question

我的目标是让用户上传文档，但是我的程序会自动命名该文档。 本质上，从视图中，我将名称传递到表单中，该名称放置在文档模型的“描述”字段中。 谢谢！

Views.py

def testing(request):
if request.method == 'POST':
    name = 'testing'
    form = DocumentForm(request.POST, request.FILES, description=name)
    if form.is_valid():
        form.save()
        return redirect('landing')
else:
    form = DocumentForm()
return render(request, 'testing.html', {
    'form': form
})

表格

class DocumentForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
    description = kwargs.pop('description')
    super(DocumentForm,self).__init__(*args, **kwargs)
    self.fields['description'].initial = description

class Meta:
    model = Document
    fields = ('description', 'document', )

models.py

class Document(models.Model):
    description = models.CharField(max_length=255, blank=True)
    document = models.FileField(upload_to='documents/')
    uploaded_at = models.DateTimeField(auto_now_add=True)

Answer 1

从ModelForm更新新实例仅需要修改视图中的保存。 让我知道这是否不是您的意思，我应该能够进一步提供帮助。

def testing(request):
    if request.method == 'POST':
        name = 'testing'
        form = DocumentForm(request.POST, request.FILES, description=name)
        if form.is_valid():
            # get instance but don't commit to database
            doc = form.save(commit=False)
            # do modifications to the instance here.
            doc.description = name
            # save the instance with all modifications
            doc.save()
            return redirect('landing')
    else:
        form = DocumentForm()
    return render(request, 'testing.html', {
        'form': form
    })

更新1在您的kwargs.pop("description")您需要执行以下操作。 发生的情况是，在其他情况下，您创建的表单没有description关键字。

class DocumentForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(DocumentForm,self).__init__(*args, **kwargs)
        if 'description' in kwargs:
            description = kwargs.pop('description')
            self.fields['description'].initial = description

    class Meta:
        model = Document
        fields = ('description', 'document', )