Django的視圖和表單的提交按鈕更新數據庫

Question

這是一個提交按鈕的形式是

<form> 
      <button type="submit" name="subscribe" class="btn btn-primary pull-right">Subscribe</button></h5> 
     </form> 

而且我有這樣的代碼在我看來：

def tour_sub(request): 
    tour = Tour.objects.filter(id=1) 
    if 'subscribe' in request.POST: 
     tour.subscribers.add(user) 
     tour.save() 

當訂閱按鈕點擊我只想更新記錄並將其插入到數據庫中。但是當我點擊訂閱按鈕時沒有任何反應。我是django的新手，我不知道問題出在哪裏。

Answer 1

指定窗體操作

所有你需要的，如果tour_sub的觀點是不是呈現包含表單模板以指定表單的動作的第一。還可以使用input類型提交。

<form action="/some/url/mapped/to/tour_sub/view/"> 
     <input type="submit" name="subscribe" class="btn btn-primary pull-right" value="Subscribe" /> 
</form> 

使用條件和錯誤處理

，你還可以修改tour_sub功能一點，做一些錯誤處理，使得它的方法沒有無記載錯誤，因爲它們很難調試。

def tour_sub(request): 

    tour = get_object_or_404(Tour, pk=1) 
    if (request.method == "POST") and ("subscribe" in request.POST): 
     tour.subscribers.add(user) 
     tour.save() 
     # Send a Success Message to the User 
    else: 
     # Do something in case of a GET request 

如果帖子是AJAX

如果您正在使用AJAX記得你特別需要的csrf_token添加到POST數據使POST請求。否則，您可以將以下通用js文件包含到您的基本模板中，並且它將負責將csrf_token附加到所有AJAX請求。

$(document).ajaxSend(function(event, xhr, settings) { 
    function getCookie(name) { 
     var cookieValue = null; 
     if (document.cookie && document.cookie != '') { 
      var cookies = document.cookie.split(';'); 
      for (var i = 0; i < cookies.length; i++) { 
       var cookie = jQuery.trim(cookies[i]); 
       // Does this cookie string begin with the name we want? 
       if (cookie.substring(0, name.length + 1) == (name + '=')) { 
        cookieValue = decodeURIComponent(cookie.substring(name.length + 1)); 
        break; 
       } 
      } 
     } 
     return cookieValue; 
    } 
    function sameOrigin(url) { 
     // url could be relative or scheme relative or absolute 
     var host = document.location.host; // host + port 
     var protocol = document.location.protocol; 
     var sr_origin = '//' + host; 
     var origin = protocol + sr_origin; 
     // Allow absolute or scheme relative URLs to same origin 
     return (url == origin || url.slice(0, origin.length + 1) == origin + '/') || 
      (url == sr_origin || url.slice(0, sr_origin.length + 1) == sr_origin + '/') || 
      // or any other URL that isn't scheme relative or absolute i.e relative. 
      !(/^(\/\/|http:|https:).*/.test(url)); 
    } 
    function safeMethod(method) { 
     return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method)); 
    } 

    if (!safeMethod(settings.type) && sameOrigin(settings.url)) { 
     xhr.setRequestHeader("X-CSRFToken", getCookie('csrftoken')); 
    } 
});