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当我加载 html 页面时，数据库中的结果没有出现。我正在使用 python 和 jinja2。{{ initial_city }} 显示正确的结果，问题似乎出在 get_deals 或我使用 jinja2 的 html 文件上。我想显示与主页上选择的城市相同的结果（它是一个表单）。此外，我在数据库中有实体，这些实体在进入谷歌数据存储本地扩展时出现

get_deals 代码是：

    def get(self):
        def get_deals(choose_city, update=False):
            key = str(choose_city)
            all_deals = memcache.get(key)
            if all_deals is None:
                d = Deal.all()
                all_deals = d.filter('city = ', choose_city)
                all_deals = list(all_deals)
                memcache.set(key, all_deals)
           return all_deals

以下是我的脚本：

from google.appengine.ext import db
from google.appengine.api import memcache
from google.appengine.ext.db import stats
from models import Deal
import os
import webapp2
import jinja2



class Deal(db.Model):
   title = db.TextProperty()
   description = db.TextProperty()
   city = db.TextProperty()

 deal = Deal(title='Hello',
        #description='Deal info here',
        #city='New York')
 deal.put()



jinja_environment = jinja2.Environment(autoescape=True,
    loader=jinja2.FileSystemLoader(os.path.join(os.path.dirname(__file__), 'templates')))

class MainPage(webapp2.RequestHandler):
  def get(self):
      template = jinja_environment.get_template('index.html')
      self.response.out.write(template.render())


class DealHandler(webapp2.RequestHandler):
    def get(self):
        def get_deals(choose_city, update=False):
            key = str(choose_city)
            all_deals = memcache.get(key)
            if all_deals is None:
                d = Deal.all()
                all_deals = d.filter('city = ', choose_city)
                all_deals = list(all_deals)
                memcache.set(key, all_deals)
           return all_deals


    choose_city = self.request.get('c')
    try:
        initial_city = str(choose_city)
        choose_city = initial_city
    except ValueError:
        initial_city = 0
        choose_city = initial_city


    template = jinja_environment.get_template('deal.html')
    self.response.out.write(template.render(initial_city = initial_city, get_deals = get_deals))



    app = webapp2.WSGIApplication([('/', MainPage),
                           ('/deal', DealHandler),
                           ('/content', ContentHandler)],
                          debug=True)

我没有显示结果的html页面是：

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="/twitter-bootstrap/twitter-bootstrap-      v2/docs/assets/css/bootstrap.css">
<title>
Deallzz: Chosen City: {{ initial_city }}
</title>
</head>
<body>
All deals:

{% for deal in deals %}
<li>{{ get_deals }}</li>
{% endfor %}

</body>
</html>
4

3 回答 3

2

  1. 在您的代码中，您没有调用get_deals函数。我建议你get_deals()退出get()并称之为

    self.response.out.write(template.render(initial_city = initial_city, get_deals =self.get_deals(choose_city)))

    因为它是一个很好的设计。

    编辑如果您不打算这样做，请
    更改为“get_deals()”。self.get_deals()

  2. 您deals在 html 中使用，但在从服务器调用时未指定其值。可能你想做的是 

    {% for deal in get_deals %}    
    {{ deal }}  
{% endfor %}
于 2012-10-04T06:00:08.223 回答
0

您实际上并没有调用 get_deals 函数。

于 2012-10-04T05:56:01.203 回答
0

你可以尝试插入

get_deals = get_deals(choose_city)

前

self.response.out.write(template.render(initial_city = initial_city, get_deals = get_deals))

埃米尔的建议也应该奏效。希望有帮助！

于 2012-10-04T10:19:58.403 回答