Question

我在这里尝试做的是将变量result传递给模板。我的问题是我需要将变量path作为参数传递给tumor_classification()函数，以获得result的值。＆＃39;路径的价值＆＃39;是从save()函数获得的，因为我覆盖了它。我尝试将变量path设为全局，但它不起作用（＆＃39;路径＆＃39;保持为空）。我怎样才能做到这一点？以下代码显示了我的views.py文件：

from django.http import HttpResponseRedirect
from django.core.urlresolvers import reverse
from django.views.generic import FormView, DetailView, ListView
from django.conf import settings

import os

from .forms import BrainImageForm
from .models import BrainImage
from .brain import *

global result

class BrainImageView(FormView):
    template_name = 'brain_image_form.html'
    form_class = BrainImageForm
    def form_valid(self, form):


        brain_image = BrainImage(
            image = self.get_form_kwargs().get('files')['image']
        )

        brain_image.save()
        global path
        path = brain_image.save() # this is the variable I need to pass to the function tumor_classification() below

        self.id = brain_image.id

        return HttpResponseRedirect(self.get_success_url())

    def get_success_url(self):

        return reverse('brain_image',kwargs = {'pk': self.id})

class BrainImageIndexView(ListView):

    model = BrainImage
    template_name = 'brain_image_view.html'
    context_object_name = 'images'

    def tumor_classification(image_address):

            path = settings.MEDIA_ROOT+'/'+image_address
            img = selectImage(path)
            segmented = segmentation(img)
            replaced = replace(img, segmented)
            extractFeatures(replaced)
            classif = createSVMClassifier(settings.BASE_DIR+'/main/datasets/input_features.csv', settings.BASE_DIR+'/main/datasets/benign_input_features.csv')
            result = classify(classif, "tumor_features.csv")

            return result   

    result = tumor_classification(path) # this is where I need to pass the 'path' variable
    queryset = BrainImage.objects.all()

谢谢！

Answer 1

如果path是短时间内需要的东西，您可以将其存储在会话中。请参阅sessions manual以供参考。会话与当前登录用户相关联。

request.session.put('path', path)

request.session.get('path', default='something)

但是，如果用户将多次调用创建BrainImage的视图，而不是会话中的路径值或将被覆盖（全局也是如此）

处理这种情况的最佳方法是将path存储在数据库中，例如存储在BrainImage中。通过这种方式，您可以在线程安全，多用户安全的其他视图中检索它，以及更为重要的持久方式。

Answer 2

通常是通过覆盖视图中的get_context_data方法来完成的，所以：

def get_context_data(self, **kwargs):
    context = super(BrainImageIndexView, self).get_context_data(**kwargs)
    context["result"] = self.something()
    return context

但你想要的东西似乎有些不同，你应该在模型定义中移动def tumor_classification(image_address):，更改签名以从对象本身获取图像地址而不是参数，然后在模板中执行类似

的操作

 {% for img in images %}
      {{ img.get_tumor_classification }}
 {% endfor %}

模型中方法的示例：

class BrainImage(models.Model):
    ....
    def tumor_classification(self):
        image_address = self.image.path
        path = settings.MEDIA_ROOT+'/'+image_address
        img = selectImage(path)
        segmented = segmentation(img)
        replaced = replace(img, segmented)
        extractFeatures(replaced)
        classif = createSVMClassifier(settings.BASE_DIR+'/main/datasets/input_features.csv', settings.BASE_DIR+'/main/datasets/benign_input_features.csv')
        result = classify(classif, "tumor_features.csv")

        return result

Django将变量作为参数传递给视图中的函数

2 个答案: