如何正確使用Jinja2計數/長度沒有錯誤？

我在我的模板，得到這個：如何正確使用Jinja2計數/長度沒有錯誤？

<h2> 
    Users ({{ users|length }}) 
</h2>

而且我也得到了展示用戶的行的循環：

{% for user in users %}  
    <tr> 
     <td> 
      {{ user.email }} 
      etc... 
     </td> 
    </tr> 
    {% endfor %}

我看不到我在做什麼錯。用戶表很好。但是，當我與長度過濾器添加了H2，我得到這個錯誤：

Traceback (most recent call last): 
    File "/Users/sean/Projects/appcash.me/_git/www/bottle.py", line 856, in _handle 
    return route.call(**args) 
    File "/Users/sean/Projects/appcash.me/_git/www/bottle.py", line 1721, in wrapper 
    rv = callback(*a, **ka) 
    File "/Users/sean/Projects/appcash.me/_git/www/views/admin.py", line 27, in custom_admin_page 
    return template('admin/users.html', users=users) 
    File "/Users/sean/Projects/appcash.me/_git/www/bottle.py", line 3487, in template 
    return TEMPLATES[tplid].render(kwargs) 
    File "/Users/sean/Projects/appcash.me/_git/www/datafly/core.py", line 184, in render 
    return self.tpl.render(**_defaults) 
    File "/Users/sean/Projects/appcash.me/_git/venv/lib/python2.7/site-packages/jinja2/environment.py", line 969, in render 
    return self.environment.handle_exception(exc_info, True) 
    File "/Users/sean/Projects/appcash.me/_git/venv/lib/python2.7/site-packages/jinja2/environment.py", line 742, in handle_exception 
    reraise(exc_type, exc_value, tb) 
    File "<template>", line 3, in top-level template code 
    File "<template>", line 57, in top-level template code 
    File "<template>", line 8, in block "content" 
TypeError: object of type 'Cursor' has no len()

來源

2014-03-28 df-sean

你能否說明你'如何用長度過濾器添加h2'？ – vivekagr

你可以試試這個：

{{ users.count() }}

來源

2014-03-28 23:21:37 chishaku

你users變量似乎Cursor類型（沒有長度）。

也許你打算在你的python（不是模板）代碼中做rows = users.fetchall()？然後len(rows)將起作用，您的模板中將會有rows|length。

來源

2014-03-29 19:14:39

如何正確使用Jinja2計數/長度沒有錯誤？

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