Question

我试图实现一个下拉表单，根据下拉列表中的选择过滤对象。我没有遇到任何问题，但是当没有选择任何内容并点击提交时，它会给我一个错误。我希望它不过滤任何东西，只是给出整个对象列表，但我在线上得到以下错误Specialization matching query does not exist

spec = Specialization.objects.get(name = s_name)

以下是我的表单

的模板

<form action="/doclistings/" method="GET" >
        <select class="form-control" id="selection" name="selection">
          <option><b>Choose a Speciality...</b></option>
          {% for value, text in form.selection.field.choices %}
            <option name="choicemade" value="{{ value }}">{{ text }}</option>
          {% endfor %}
          <!-- {% csrf_token %} -->
        </select>

        <span class="input-group-btn">
          <button class="btn btn-primary" type="submit"  name="submit" id="ss-submit">Find Doctors</button>
        </span>
      </form>

这是表格

MY_CHOICES = (
    ('Dermatologist', 'Dermatologist'),
    ('Dentist', 'Dentist'),
    ('Orthopedist', 'Orthopedist'),
    ('Pediatrician', 'Pediatrician'),
)

class DropdownSelectionForm(forms.Form):
    selection = forms.ChoiceField(choices=MY_CHOICES, widget = forms.Select, required = False)
    genderselect = forms.ChoiceField(choices=GENDER_CHOICES, widget= forms.Select, required = False)

这是呈现下拉表单

的视图

def index(request):
    d = getVariables(request,dictionary={'page_name': "Home"})
    if request.method == "POST":
        form = DropdownSelectionForm(request.POST)

        if form.is_valid():
            selection = form.cleaned_data['selection']

            return HttpResponseRedirect('/doclistings')
    else:
        form = DropdownSelectionForm()

    return render(request, 'meddy1/index.html', {'form': form})

以下是根据选择

渲染对象的视图

def doclistings(request):
    d = getVariables(request)
    if request.method == "GET":

        s_name = request.GET['selection']

        if s_name == "":
            doctors = Doctor.objects.all().order_by('-netlikes')

        else:
            spec = Specialization.objects.get(name = s_name)
            doctors = Doctor.objects.filter(specialization = spec).order_by('-netlikes')

    else:
        return HttpResponseRedirect('/doclistings')


    d['doctors'] = doctors
    return render_to_response('meddy1/doclistings.html',d)

Answer 1

这就是你应该使用QueryDict方法的原因：

s_name = request.GET.get('selection', None)
if not s_name:
    #if s_name is None
    #...

这样，如果s_name不存在，它将正确回退。

Django 1.6：匹配查询不存在

1 个答案: