通過在Django中的id字段檢索數據庫對象

Question

我想通過它的ID已經從模板中隱藏的輸入字段傳遞但無法獲取對象的其他視圖中檢索實例對象。

這裏是我的文件：

BuildImage.html

{% block content %} 
<form class="form-horizontal" method="POST" id="dockerForm"> 
        {% csrf_token %} 
        <fieldset> 
         <div class="form-group"> 
          <span class="col-md-1 col-md-offset-2 text-center"><i class="fa fa-user bigicon"></i><label for="package">Docker Image Tag Name:</label></span> 
          <div class="col-md-8"> 
           <input type="text" name="tagName" id="tagName" placeholder="e.g node_image/istiogui" class="form-control" required> 
           <input type="hidden" id="id" name="id" value="{{ id }}"> 
          </div> 
         </div> 
         <div class="form-group"> 
          <div class="col-xl-12 text-center"> 
           <button type="button" class="btn btn-primary btn-info"><a href="/gui" style="color:white">Back</a></button> 
           <button type="submit" class="btn btn-primary btn-info">Build</button> 
          </div> 
         </div> 
        </fieldset> 
</form> 

{{ id }} is working as I have placed it at another place in this template.

models.py

class Instance(models.Model): 
    id = models.AutoField(primary_key=True) 
    user = models.ForeignKey(User, related_name='instances') 
    name = models.CharField(max_length=255) 
    serverFile = models.TextField(default='', blank=False) 
    jsonPackageFile = models.TextField(default='', blank=False) 
    created_at = models.DateTimeField(default=timezone.now, editable=False) 

class Meta: 
    ordering = ['-created_at'] 


class ImageModel(models.Model): 
    tagName = models.CharField(max_length=255) 
    id = models.ForeignKey(Instance, primary_key=True) 

views.py

class BuildImage(LoginRequiredMixin, CreateView): 
def get(self, request, *args, **kwargs): 
    return render(request, 'instances/BuildImage.html', {}) 

def post(self, request, *args, **kwargs): 
    if request.method == 'POST': 
     pathlib.Path("mydir").mkdir(parents=True, exist_ok=True) 
     dockerfile = """ 
     FROM node 
     # Create app directory 
     RUN mkdir -p /usr/src/app 
     WORKDIR /usr/src/ap 

     # Install app dependencies 
     COPY package.json /usr/src/app/ 
     RUN npm install 

     # Bundle app source 
     COPY . /usr/src/app 

     EXPOSE 8080 
     CMD [ "npm", "start" ]""" 
     cFile = open("mydir/dockerfile", "w") 
     cFile.write(dockerfile) 
     cFile.close() 
     the_form = forms.BuildImageForm(request.POST) 
     if the_form.is_valid(): 
      data = the_form.cleaned_data 
      instance_id = data['id'] 
      obj = Instance.objects.all(id=str(instance_id)) 
      title = obj.name 
      code = obj.serverFile 
      package = obj.jsonPackageFile 
      cFile = open("mydir/"+ title, "w") 
      cFile.write(code) 
      cFile.close() 
      cFile = open("mydir/package.json", "w") 
      cFile.write(package) 
      cFile.close() 
    return HttpResponse(status=200) 

urls.py

urlpatterns = [ 
url(r'^create/$', views.CreateInstance.as_view(), name='create'), 
url(r'^buildImage/$', views.BuildImage.as_view(), name='buildImage'), 
] 

Answer 1

嘗試，在你看來，改變這一行，

obj = Instance.objects.get(id=int(instance_id))