小白问题-views传过去的表单和数据在页面看不到

大家好，我再views.py里的表单及数据不能在html页面显示，具体代码如下：

def message(request):

    messages=Msg.objects.all()
    if request.method == 'POST':
        form = MessageForm(request.POST)
        if form.is_valid():
            user = form.cleaned_data['user']
            title = form.cleaned_data['title']
            content = form.cleaned_data['content']
            m = Msg(user=user,
                        title=title,
                        content=content,
                        )
            m.save()
            return HttpResponseRedirect('registration/index.html')
    else:
        form = MessageForm()
        return render_to_response('registration/index.html',{'form':form, 'messages':messages},context_instance=RequestContext(request))

html如下：

<html>
<head><title> Leave your message here </title></head>
<body>
<h1>留言</h1>
<table>

  {% for message in messages %}
      <br/>
   <tr>
   <strong> Time:</strong>{{ message.datetime|date:'Y-m-d H:i:s'}}
   </tr>
      <br/>
   <tr>
    <strong>From:</strong>{{ message.user }}
   </tr>
      <br/>
  <tr>
   <strong> Title:</strong>{{ message.title }}
  </tr>
      <br/>
  <tr>
   <strong> Content:</strong>{{ message.content }}
  </tr>
      <br/>
  <hr>
  {% endfor %}
</table>
<h2>Leave your message</h2>
<form action="." method="POST">
    {% csrf_token %}
    <table>
        {{ form.as_table }}
    </table>
    <p><input type="submit" value="提交"></p>
</form>
</body>
</html>

请各位大神看看问题在哪里，感恩！