在POST数据中丢失了Django表单输入

Question

我正在使用Django 1.9.8，我试图学习如何使用表单验证。我正在制作注册用户的表单。我有两个问题，我坚持。

1. 在forms.py文件方法中，无法访问重新输入密码的字段（相反，根本没有）。当我使用raise Exception(self.cleaned_data.get('password'))查看内容时，会显示密码。我也可以查看用户名和电子邮件。当我做了确认密码字段一样，它显示None编辑 - 这是通过改变forms.py文件使用干净（）方法

2. 验证错误不是我的形式显示在所有解决。如果出现错误，重新导向到表单正在工作，但输入中没有任何内容供用户修复，也不显示错误。 编辑 - 通过改变else语句后RegisterForm呼叫解决了form = RegisterForm(request.POST)

这里是forms.py文件

#forms.py 
class RegisterForm(forms.Form): 
    username = forms.CharField(label="Username", max_length=30, 
           widget=forms.TextInput(attrs={'class': 'form-control', 'name': 'username'})) 
    email = forms.CharField(label="Email", max_length=30, 
           widget=forms.TextInput(attrs={'class': 'form-control', 'name': 'email'})) 
    password = forms.CharField(label="Password", max_length=30, 
           widget=forms.TextInput(attrs={'class': 'form-control', 'name': 'password', 'type' : 'password'})) 
    repassword = forms.CharField(label="RePassword", max_length=30, 
           widget=forms.TextInput(attrs={'class': 'form-control', 'name': 'repassword', 'type' : 'password'})) 

    #Edit - this was changed to the clean() function in the selected answer. 
    def clean_password(self): 
     password1 = self.cleaned_data.get('password') 
     password2 = self.cleaned_data.get('repassword') 
     #raise Exception(self.cleaned_data.get('repassword')) # None is displayed 

     if password1 and password1 != password2: 
      raise forms.ValidationError("Passwords don't match") 
     return self.cleaned_data 

这里的表单模板

#register.html 

{% if form.errors %} 
    <h2>ERROR!</h2> 
    {% for field in form %} 
     {% for error in field.errors %} 
      <div class="alert alert-error"> 
       <strong>{{ error|escape }}</strong> 
      </div> 
     {% endfor %} 
    {% endfor %} 
{% endif %} 

<form method="post" action="" id="RegisterForm"> 
{% csrf_token %} 
    <p class="bs-component"> 
     <table> 
      <tr> 
       <td>{{ form.username.label_tag }}</td> 
       <td>{{ form.username }}</td> 
      </tr> 
      <tr> 
       <td>{{ form.email.label_tag }}</td> 
       <td>{{ form.email }}</td> 
      </tr> 
      <tr> 
       <td>{{ form.password.label_tag }}</td> 
       <td>{{ form.password }}</td> 
      </tr> 
      <tr> 
       <td>{{ form.repassword.label_tag }}</td> 
       <td>{{ form.repassword }}</td> 
      </tr> 
     </table> 
    </p> 
    <p class="bs-component"> 
     <center> 
      <input class="btn btn-success btn-sm" type="submit" value="Register" /> 
     </center> 
    </p> 
    <input type="hidden" name="next" value="{{ next }}" /> 
</form> 

这里的查看

#views.py 
class RegisterViewSet(viewsets.ViewSet): 

    #GET requests 
    def register(self,request): 
     return render(request, 'authorization/register.html', {'form': RegisterForm}) 

    #POST requests 
    def create(self,request): 
     form = RegisterForm(request.POST) 
     if form.is_valid(): 
      username = request.POST['username'] 
      email = request.POST['email'] 
      password = request.POST['password'] 
      user = User.objects.create_user(username,email,password) 
      user.save() 
      return HttpResponseRedirect('/users') 
     else: 
      return render(request, 'authorization/register.html', {'form': RegisterForm }) 
      #changed the previous line to the following. This fixed the errors not displaying 
      #return render(request, 'authorization/register.html', {'form': RegisterForm(request.POST) }) 

Answer 1

我不是％100肯定为什么self.cleaned_data.get('repassword')在该方法中返回None，但clean_password不是执行相互依赖的字段的验证的正确位置。

据docs，你应该在clean()功能进行那种验证：

views.py

def register(self,request): 
    form = RegisterForm() # Notice `()` at the end 
    return render(request, 'authorization/register.html', {'form': form}) 

forms.py

... 

def clean(self): 
    cleaned_data = super(RegisterForm, self).clean() 

    password1 = cleaned_data.get('password') 
    password2 = cleaned_data.get('repassword') 

    if password1 and password1 != password2: 
     raise forms.ValidationError("Passwords don't match") 

请注意，您不必执行clean_password和clean_repassword。

（如果你认为你还是要落实clean_password，你必须回到password1从它，而不是self.cleaned_data）

您还需要正确呈现形式错误，在docs描述。

不要忘记将其添加到您的模板：

{{ form.non_field_errors }} 

至于第二个错误，问题是，每个验证失败时，你正在返回，而不是无效的一个新的新鲜RegisterForm实例。

您应该更改行create()功能：

return render(request, 'authorization/register.html', {'form': RegisterForm}) 

这样：

return render(request, 'authorization/register.html', {'form': form})