如何在我的Django表單中提出錯誤？

Question

我在服務器中有一個PHP腳本，返回{"available":true}或{"available":false}，具體取決於電子郵件地址是否可用。這裏是代碼：

<?php 

$servername = "localhost"; 
$username = "root"; 
$password = "mysqlpass"; 
$dbname = "testdb"; 

// Create connection 
$conn = new mysqli($servername, $username, $password, $dbname); 
// Check connection 
if ($conn->connect_error) { 
    die("Connection failed: " . $conn->connect_error); 
} 

$sql = "SELECT username FROM testtable"; 
$result = $conn->query($sql); 

$query = $_GET['query'].'@groupdesignace.com'; 
$arr = array(); 

if ($result->num_rows > 0) { 
    // output data of each row 
    while($row = $result->fetch_assoc()) { 
    $arr[] = $row['username']; 
    } 

    if (in_array($query, $arr)) { 
    $output = array('available' => false); 
    echo json_encode($output); 
    } else { 
    $output = array('available' => true); 
    echo json_encode($output); 
    } 
} else { 
    echo "0 results"; 
} 
$conn->close(); 

?> 

在不同的服務器上，用戶通過表單請求他們的電子郵件地址，我使用的是Django。我寫了下面的代碼來檢查電子郵件是否可用，如果沒有，應該引發錯誤。下面是代碼：

class RequestEmailAddressForm(forms.Form): 
    email = forms.CharField(label='Email', max_length=100) 
    password = forms.CharField(widget=forms.PasswordInput) 

    def clean_email(self): 
     email = self.cleaned_data.get('email') 

     if email: 
      import requests 

      payload = {'query': email} 
      r = requests.get('http://172.16.16.172/check_email.php', params=payload) 
      result = r.json() 
      print r.url 

      status = result['available'] 
      if status == False: 
       raise forms.ValidationError('This login name is unavailable!') 
     return email 

這是我的觀點，是處理形式：

def request_email_address(request): 
    if request.method == "POST": 
     form = RequestEmailAddressForm(request.POST) 
     if form.is_valid(): 
      data = form.cleaned_data 
      # do something here 
     else: 
      pass 
     return HttpResponseRedirect('/core/home/') 
    else: 
     form = RequestEmailAddressForm() 
    return render(request, "core/request_email_address.html", { "form": form }) 

然而，形式要提交的頁面，但它沒有提高驗證錯誤。我究竟做錯了什麼？

Answer 1

如果表單無效，你什麼都不做。當提出ValidationError時，django設置form.errors字典，其中包含有關驗證期間出錯的數據。更多https://docs.djangoproject.com/en/1.10/ref/forms/validation/

def request_email_address(request): 
    if request.method == "POST": 
     form = RequestEmailAddressForm(request.POST) 
     if form.is_valid(): # <- form validation is called on this line 
      data = form.cleaned_data 
      # do something here 
      # do redirect here 
      return HttpResponseRedirect('/core/home/') 
     else: 
      pass 
    else: 
     form = RequestEmailAddressForm() 
    return render(request, "core/request_email_address.html", { "form": form })