以表格的形式顯示None而不是資料

此處選擇機器名稱和操作編號，選擇保存后，以表格的形式顯示無，而不是機器名稱和操作編號等資料。請幫我解決這個問題。我是 Django 的新手。

網址.py：

urlpatterns = [
    path('upload/',views.upload,name='upload'),
    path('save',views.save_machine,name='save_machine')
]

視圖.py：

def upload(request):
    machines = Machine.objects.all()
    return render(request,'usermaster/upload.html',{'machines':machines})

def save_machine(request):
   if request.method == "POST":
      machine_name = request.POST.get('machine_name', '')
      operation_no = request.POST.get('operation_no')
      choiced_machine = Machine.objects.get(machine_name=machine_name, operation_no=operation_no)
      machines = Machine.objects.all()
      return render(request,'usermaster/upload.html',{'machines':machines,'choiced_machine':choiced_machine})

模型.py：

class Machine(models.Model):
    machine_name = models.CharField(max_length=200)
    operation_no = models.IntegerField(null=False)

    def __str__(self):
        return self.machine_name

上傳.html：

<form action="{% url 'save_machine' %}" method="post">
    {% csrf_token %}
       <select>
           <option>Select Machine Name</option>
           {% for machine in machines %}
           <option name="machine_name">{{ machine.machine_name }}</option>
           {% endfor %}
       </select>
       <br>
       <br>
       
       <select>
           <option>Select Operation Number</option>
           {% for machine in machines %}
           <option name="operation_no">{{ machine.operation_no }}</option>
           {% endfor %}
           </select>
       <br>
       <br>
       <br>
       <input type="submit" value="Save">
   </form>

<tr>
    <td>{{choiced_machine.machine_name}}</td>
    <td>{{choiced_machine.operation_no}}</td>
</tr>

uj5u.com熱心網友回復：

試試這個

<form action="{% url 'save_machine' %}" method="post">
    {% csrf_token %}
       <label for="machinename">Select Machine Name:</label>
       <select name="machinename" id="machinename">
           
           {% for machine in machines %}
           <option value="{{ machine.machine_name }}">{{ machine.machine_name }}</option>
           {% endfor %}
       </select>
       <br>
       <br>
       <label for="operationname">Select Operation Number:</label>
       <select id="operationname" name="operationname">
           
           {% for machine in machines %}
           <option value="{{ machine.operation_no }}">{{ machine.operation_no }}</option>
           {% endfor %}
           </select>
       <br>
       <br>
       <br>
       <input type="submit" value="Save">
   </form>

<tr>
    <td>{{choiced_machine.machine_name}}</td>
    <td>{{choiced_machine.operation_no}}</td>
</tr>

像這樣改變你的看法。

def save_machine(request):
   if request.method == "POST":
      machine_name = request.POST.get('machinename', '')
      operation_no = request.POST.get('operationname','')
      choiced_machine = Machine.objects.get(machine_name=machine_name, operation_no=operation_no)
      machines = Machine.objects.all()
      return render(request,'usermaster/upload.html',{'machines':machines,'choiced_machine':choiced_machine})

uj5u.com熱心網友回復：

嘗試像下面這樣編輯您的表單。當前您沒有傳遞任何值，因此發生內部服務器錯誤，并且您沒有從服務器獲得任何回應，因此顯示無錯誤

 <select name="machine_name">
    <option>Select Machine Name</option>
    {% for machine in machines %}
    <option value="{{ machine.machine_name }}">{{ machine.machine_name }}</option>
    {% endfor %}
</select>

<select name="operation_no">
    <option>Select Operation Number</option>
    {% for machine in machines %}
    <option value="{{machine.operation_no}}">{{ machine.operation_no }}</option>
    {% endfor %}
</select>

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