当 Django views.py 没有将字典值传递给 html 时如何解决？

Question

我在 views.py 中有一个字典值并将其呈现到前端。当我在 html 中遍历字典时，只显示一个值，而其他值不显示。这可能是什么问题？

views.py

def Student_Create(request):
    form = Student_Model_Form(request.POST or None)
    # get class names and days
    classes = Create_Class.objects.all()
    cls = {}
    for i in classes:
        cls[i] = {
            'class_name': i.class_name,
            'from_day': str(i.from_days),
            'to_day': str(i.to_days),
            'from_time': i.from_time.strftime("%H:%M:%S"),
            'to_time': i.to_time.strftime("%H:%M:%S"),
        }
    print(cls)
    template_name = 'genius/students_create.html'
    context = {'form': form, 'classes': cls}
    return render(request, template_name, context)

student.html

<div class="form-group">
  <label for="select-class">Select Class</label>
  <select class="custom-select" multiple name="select-class">
     {% for i in classes%}
      <option value="{{i.class_name}}">{{i.class_name}} : {{i.from_day}}-{{i.to_day}}</option>
     {% endfor %}
  </select>
</div>

而最终的输出是这样的。

See The Output

您的帮助将不胜感激。

Answer 1

您可以使用列表来存储数据：

...
cls = []  # Change from dict to list.
for i in classes:
    cls.append({
        'class_name': i.class_name,
        'from_day': str(i.from_days),
        'to_day': str(i.to_days),
        'from_time': i.from_time.strftime("%H:%M:%S"),
        'to_time': i.to_time.strftime("%H:%M:%S"),
    })
...

Answer 2

而不是像上面那样创建字典。你可以做 视图.py

def Student_Create(request):
    form = Student_Model_Form(request.POST or None)
    # get class names and days
    classes = Create_Class.objects.values_list('class_name', 'from_days', 'to_days' ,'from_time', 'to_time', flat=True)
    template_name = 'genius/students_create.html'
    context = {'form': form, 'classes': classes}
    return render(request, template_name, context)