title: how to download a filefield file in django view
body: <p>I have filefield in my django model:</p>
  
  <pre><code>file=models.FileField(verbose_name=u'附件',upload_to='attachment/%Y/%m/%d',max_length=480)
  </code></pre>
  
  <p>This file will display in the web page with link "http://test.com.cn/home/projects/89/attachment/2012/02/24/sscsx.txt"</p>
  
  <p>What I want to do is when user click the file link, it will download the file automatically;
  Can anyone tell me how to do this in the view?</p>
  
  <p>Thanks in advance!</p>