Question

我正在尝试从django中的db中检索数据。我想在表格中显示它。我收到一个错误：\

强制转换为Unicode：需要字符串或缓冲区，找到TransType

我的Models.py文件中有两个模型：

class TransType(models.Model):
  name = models.TextField()
  created = models.DateTimeField(auto_now_add = True)
  updated = models.DateTimeField(auto_now = True) 
  def __unicode__(self):
      return self.name

class Trans(models.Model):
  transtype = models.ForeignKey(TransType)
  script = models.CharField(max_length=200)
  created = models.DateTimeField(auto_now_add = True)
  updated = models.DateTimeField(auto_now = True) 
  class Meta:
        unique_together = (("transtype", "script"),)
  def __unicode__(self):
      return self.transtype`

我的views.py文件

def updatetrans(request):
  json_data=open('/home/ttt/Ali/a.json').read()
  data = json.loads(json_data)
  for pk, pv in data.iteritems():
        for k,v in pv.iteritems():
              try:
                    trans_type = TransType.objects.get_or_create(name=k)
                    trans = Trans()
                    trans.transtype_id = trans_type[0].id
                    if isinstance(pv[k], basestring):
                          script = pv[k]
                    else:
                          print "****** List ****"
                          script = pv[k][1]
                    trans.script = script
                    trans.save()
                    print " Inserted ==>", script
              except Exception, e:
                    print e
                    #print "Not inserted ==>", pv[k][1]
                    pass
  #return HttpResponse("Done")
  info = TransType.objects.all()
  info2 = Trans.objects.all()
  bookdata = { "details" : info, "details" : info2 }
  print bookdata
  return render_to_response("account/updatetrans.html", bookdata, context_instance=Context(request))

我的url.py文件

url(r'^updatetrans/$', 'booki.account.views.updatetrans', name='updatetrans'),

我的updatetrans.html文件

{% load i18n %}
<!doctype html>
<html>
<body>

<button type="button" onclick="alert('Hello world!')">Click Me!</button>
<table border="1" style="width:800px">
<tr><td>    
  {% for s in details %}
        {{ s.script }}
  {% endfor %} 
</td> 
<td>     
  {% for n in detail %}
        {{ n.name }}
  {% endfor %} 
</td> 

</tr>

</table>
</body>
</html>

Plz帮助......

回溯

环境：请求方法：GET

enter code here


Django Version: 1.3
Python Version: 2.7.3
Installed Applications:
['django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.admin',
 'django.contrib.messages',
 'south',
 'booki.editor',
 'booki.account',
 'booki.reader',
 'booki.portal',
 'booki.messaging',
 'sputnik',
 'booktypecontrol']
 Installed Middleware:
 ('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.locale.LocaleMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.middleware.transaction.TransactionMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')

 Traceback:
 File "/home/ttt/abc_booktype/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response 111. response = callback(request, *callback_args, **callback_kwargs)

 File "/home/ttt/abc_booktype/Booktype/lib/booki/account/views.py" in updatetrans 808.print bookdata

 File "/home/ttt/abc_booktype/local/lib/python2.7/site-packages/django/db/models/query.py" in __repr__72. return repr(data)

 File "/home/ttt/abc_booktype/local/lib/python2.7/site-packages/django/db/models/base.py" in __repr__370. u = unicode(self)

 Exception Type: TypeError at /accounts/updatetrans/
 Exception Value: coercing to Unicode: need string or buffer, TransType found

Answer 1

回溯显示错误发生在Trans模型的__unicode__方法中。如错误所示，您需要从该方法实际返回unicode，但是您将返回相关的TransType。

您可以通过在该方法中显式转换为unicode来解决此问题：

return unicode(self.transtype)

但你可能应该选择一个更好的数据字符串表示形式：将会有许多具有相同TransType的Trans对象，因此你的unicode应该区分它们，也许还要显示脚本字段。

Answer 2

我得到了答案。现在工作正常。

<强> Views.py：

def displaytrans(request):
    TransType.objects.all()
    info = TransType.objects.all()
    info2 = Trans.objects.all()
    print info
    bookdata = { "detail" : info, "details" : info2 }
    print bookdata
    resp =  render_to_response("account/displaytrans.html", bookdata, context_instance=Context(request))
    return resp

<强> displaytrans.html：

<!doctype html>
<html>
  <body>

    <table border="1" style="width:800px">
      <tr>
        <td>  {% for s in details %} </td>
        <td>   {{ s.script }} </td>
      </tr>
      <tr> 
        <td>   {{ s.transtype_id}} </td>
        {% endfor %} 
      </tr>         
    </table>
  </body>
</html>

<强> url.py：

url(r'^displaytrans/$', 'booki.account.views.displaytrans', name='displaytrans'),

从django数据库检索数据并显示在表中

2 个答案: