django python:缺少1个必需的位置参数

Question

我正在尝试定义一个有4个参数的函数，但我的第四个参数遇到了问题，我非常确定它是愚蠢的。下面是我的代码：

views.py：

def create_recording(request, slug, inspection_id, component_id):
    inspection = get_object_or_404(Inspection, pk=inspection_id)
    plant = get_object_or_404(Plant, slug=slug)
    component=get_object_or_404(Component, pk=component_id)
    if request.method == "POST":
        form = RecordingForm(request.POST)
        if form.is_valid():
            recording = form.save(commit=False)
            recording.plant = plant
            recording.inspection=inspection
            recording.component=component
            recording.save()
            return redirect('data:inspection_detail', slug=plant.slug, inspection_id=inspection.id)
    else:
        form = RecordingForm()
    context = {'form': form, 'plant':plant,'inspection':inspection}
    template = 'data/create_recording.html'
    return render(request, template, context)

下面是我的html文件：

<a href="{% url 'data:create_recording' slug=plant.slug inspection_id=inspection.id component_id=1 %}">
   <button type="button" class="btn btn-success">
        <span class="glyphicon glyphicon-plus"></span> Chaiir
   </button> 
</a>
<a href="{% url 'data:create_recording' slug=plant.slug inspection_id=inspection.id component_id=2 %}">
   <button type="button" class="btn btn-success">
        <span class="glyphicon glyphicon-plus"></span> Table
   </button> 
</a>

url：

url(r'^plants/(?P<slug>[-\w]+)/inspection(?P<inspection_id>[0-9]+)/create_recording$', views.create_recording, name='create_recording'),

我得到了以下错误：

Exception Type: TypeError
Exception Value:create_recording() missing 1 required positional argument: 'component_id'                  

Answer 1

你的问题在这里

<a href="{% url 'data:create_recording' slug=plant.slug inspection_id=2 %}">

您没有发送视图所期望的component_id。

编辑:您的URL中存在问题：

url(r'^plants/(?P<slug>[-\w]+)/inspection(?P<inspection_id>[0-9]+)/create_recording/(?P<component_id>[\d]+)$', views.create_recording, name='create_recording'),