谷歌应用程序引擎上的Flask应用程序 - 显示数据库对象

时间:2015-06-02 20:10:26

标签: python google-app-engine flask google-app-engine-python

我正在尝试在谷歌应用引擎上制作一个烧瓶应用程序,它在自己的页面上显示数据库条目。

这是我的views.py代码:

@app.route('/posts/<int:id>')
def display_post(id):
    post = Post.filter('id =', id)
    return render_template('display_post.html', post=post)

然后我的display_posts.html

{% extends "base.html" %}

{% block content %}
<ul>
    <h1 id="">Post</h1>
    <li>
        {{ posts.title }}<br />
        {{ posts.content }}
    </li>
</ul>
{% endblock %}

现在当我有一个ID为5700305828184064的帖子并访问此页面时,我应该看到标题和内容:

www.url.com/posts/5700305828184064

但是我得到了这个追溯:

<type 'exceptions.AttributeError'>: type object 'Post' has no attribute 'filter'
Traceback (most recent call last):
  File "/base/data/home/apps/s~smart-cove-95709/1.384741962561717132/main.py", line 4, in <module>
    run_wsgi_app(app)
  File "/base/data/home/runtimes/python/python_lib/versions/1/google/appengine/ext/webapp/util.py", line 99, in run_wsgi_app
    run_bare_wsgi_app(add_wsgi_middleware(application))
  File "/base/data/home/runtimes/python/python_lib/versions/1/google/appengine/ext/webapp/util.py", line 117, in run_bare_wsgi_app
    result = application(env, _start_response)
  File "/base/data/home/apps/s~smart-cove-95709/1.384741962561717132/flask/app.py", line 874, in __call__
    return self.wsgi_app(environ, start_response)
  File "/base/data/home/apps/s~smart-cove-95709/1.384741962561717132/flask/app.py", line 864, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/base/data/home/apps/s~smart-cove-95709/1.384741962561717132/flask/app.py", line 861, in wsgi_app
    rv = self.dispatch_request()
  File "/base/data/home/apps/s~smart-cove-95709/1.384741962561717132/flask/app.py", line 696, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/base/data/home/apps/s~smart-cove-95709/1.384741962561717132/blog/views.py", line 25, in display_post
    post = Post.filter('id =', id)

如何显示给定ID的条目的标题和内容?

1 个答案:

答案 0 :(得分:1)

您需要先创建一个查询对象,然后将过滤器应用于该对象。

q = Post.all()
post = q.filter("id =", id)

这是GAE docs on queries中的第一个例子。

此外,您的模板引用了名称posts,但您传递了名称post。适当地更改模板。