python - 如何从 django 表单 ImageField 输入中获取图像

Question

我正在尝试从输入 ImageFile 中获取图像以显示在模板中，并将该 ImageFile 保存到模型 ImageField。

下面的代码会报错:

upload_img_temp.write(uploaded_image)
TypeError: a bytes-like object is required, not 'str'

表单

class UploadImageForm(forms.ModelForm):
    class Meta:
        model = Image
        fields = ['image']

查看

def uploadImageView(request):
    form = UploadImageForm(request.POST or None, request.FILES or None)
    if request.method == 'POST':
        if form.is_valid:
            request.session['image'] = request.POST['image']
            return redirect('image:create')

def imageCreateView(request):
    uploaded_image = request.session.get('image')
    upload_img_temp = NamedTemporaryFile()
    upload_img_temp.write(uploaded_image)
    upload_img_temp.flush()

    form_create = ImageModelCreateForm(request.POST or None, request.FILES or None,)

    if form_create.is_valid():
        instance = form_create.save(commit=False)
        instance.image = upload_img_temp

模板

<img class="image" src="{{ upload_img_temp }}">

  <form method="POST" action="">
    {% csrf_token %}
    <input type="submit"></input>
    {{ form }}
  </form>

型号

def upload_location(instance, filename):
    filebase, extension = filename.split(".")
    return "%s/%s.%s" %('picx', uuid.uuid4(), extension)

class Image(models.Model):
    image           = models.ImageField(
                        upload_to=upload_location,
                        null=False,
                        blank=False,
                        )

Answer 1

所以你有多个问题。

1. <form method="POST" action="" enctype='multipart/form-data' >

您需要添加 enctype='multipart/form-data'在form否则将不接受任何文件。

1. 要显示图像，您需要像 <img class="image" src="{{Image.image.url}}"> 这样的东西请注意，“图像”必须是您在 views.py 上下文部分为此模板定义的有效参数。它是对您的模型的引用，第二个“图像”关键字是指您的模型属性“图像”。 .url是必需的。

2. 将您的 views.py 更改为类似的内容:

   def uploadG(request):
     form = PostForm(request.POST or None, request.FILES or None)
     if form.is_valid():
       print ("form was valid TEST") #controll your console and check if that statement appears when you click upload.
       instance = form.save(commit = False)
       ....
       instance.save()
       messages.success(request, 'You uploaded it')
   

希望对您有所帮助。如果没有留下评论