提交表單時視圖沒有返回HttpResponse對象

Question

我有下面的錯誤，我不知道問題是什麼。 ValueError：視圖bookmarks.views.bookmark_save_page未返回HttpResponse對象。它返回None而不是。

這裏是bookmarks.views.bookmark_save_page的代碼：

def bookmark_save_page(request): 
if request.method == 'POST': 
    form = BookmarkSaveForm(request.POST) 
    if form.is_valid(): 
     link, dummy = Link.objects.get_or_create(
      url = form.cleaned_data['url'] 
     ) 
     bookmark, created = Bookmark.objects.get_or_create(
      user=request.user, 
      link = link 
     ) 
     bookmark.title = form.cleaned_data['title'] 

     if not created: 
      bookmark.tag_set.clear() 

     tag_names = form.cleaned_data['tags'].split() 
     for tag_names in tag_names : 
      tag, dummy = Tag.objects.get_or_create(name=tag_names) 
      bookmark.tag_set.add(tag) 

     bookmark.save() 
     return HttpResponseRedirect(
      '/user/%s/' %request.user.username 
     ) 
    else: 
     form = BookmarkSaveForm() 
    variables = RequestContext(request,{ 
     'form' : form 
    }) 
    return render_to_response('bookmark_save.html', variables) 

'bookmark_save.html' 的代碼：

{% extends "base.html" %} 
{% block title %}save your bookmark{% endblock %} 
{% block head %}save your bookmark{% endblock %} 
{% block content %} 
<form method="post" action="."> 
{{ form.as_p }} 
<input type="submit" value="save" /> 
</form> 
{% endblock %} 

問題是什麼？我錯過了什麼？

Answer 1

您的整個代碼在if條件下縮進，所以當最初請求頁面時，不會發送任何響應。你需要的最後一個return移動到相同的水平爲初始if：

def bookmark_save_page(request): 
    if request.method == 'POST': 
    form = BookmarkSaveForm(request.POST) 
    if form.is_valid(): 
     link, dummy = Link.objects.get_or_create(
      url = form.cleaned_data['url'] 
     ) 
     bookmark, created = Bookmark.objects.get_or_create(
      user=request.user, 
      link = link 
     ) 
     bookmark.title = form.cleaned_data['title'] 

     if not created: 
      bookmark.tag_set.clear() 

     tag_names = form.cleaned_data['tags'].split() 
     for tag_names in tag_names : 
      tag, dummy = Tag.objects.get_or_create(name=tag_names) 
      bookmark.tag_set.add(tag) 

     bookmark.save() 
     return HttpResponseRedirect(
      '/user/%s/' %request.user.username 
     ) 
    else: 
     form = BookmarkSaveForm() 
    variables = RequestContext(request,{ 
     'form' : form 
    }) 
    return render_to_response('bookmark_save.html', variables) 

您還可以進一步簡化代碼：

from django.shortcuts import render, redirect 

def bookmark_save_request(request): 
    form = BookmarkSaveForm(request.POST or None) 
    if form.is_valid(): 
     # .. your logic here 
     return redirect('/user/%s' % (request.user.username,)) 
    return render(request, 'bookmark_save.html', {'form': form})