Django Value Error“视图capstone.views.home没有返回HttpResponse对象，而是返回了None。”

Question

我将用户输入到表单中的数据保存到Django的数据库中。当我提交表单时，值实际上会保存到数据库中。但我一直收到这个错误。不确定如何修复它？

views.py

def home(request):
    if request.method == "GET":
        form_for_post = {'form': PostForm()}
        return render(request, "capstone/home2.html", form_for_post)
    else: 
        if request.method == "POST":
            form = PostForm(request.POST)

        if form.is_valid():
            city = form.cleaned_data['city']
            place = Location.objects.create(username=request.user, city=city,)
            place.save()
        else:
            return render(request, "capstone/home2.html")

models.py

class User(AbstractUser):
    pass

class Location(models.Model):
    city = models.CharField(max_length=500) 
    username = models.ForeignKey('User', on_delete=models.CASCADE, 
    related_name='author', null=True, blank=True)

forms.py：

class PostForm(forms.Form):
    city = forms.CharField(max_length=500)

html格式的表单：

<form method="POST">
    {% csrf_token %}

    <label for="city">City:</label><br>
    <input type="text" id="city" name="city"><br>

    <input type="submit" value="Submit">
  </form> 

Answer 1

默认情况下，如果发出请求，它将是一个get请求，因此不需要添加if request.method == 'GET'，如下所示

def home(request):
    form_for_post = {'form': PostForm()}
    if request.method == "POST":
       form = PostForm(request.POST)
       if form.is_valid():
          city = form.cleaned_data['city']
          place = Location.objects.create(username=request.user, city=city,)
          place.save()
          return render(request,"your_page_after_form_successfully_submited")
    return render(request, "capstone/home2.html",form_for_post)

Answer 2

def home(request):
    if request.method == "POST":
        form = PostForm(request.POST)
        if form.is_valid():
            city = form.cleaned_data['city']
            place = Location.objects.create(username=request.user, city=city,)
            place.save()
        else:
            return render(request, "capstone/home2.html",form)
    form_for_post = {'form': PostForm()}
    return render(request, "capstone/home2.html", form_for_post)

试试这个