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Editorial Team
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Asked: 2026-06-12T06:07:10+00:00

When I load the html page the results from the database are not appearing.

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When I load the html page the results from the database are not appearing. I am using python and jinja2. The {{ initial_city }} is displaying the correct results, the problem seems to be with get_deals or on the html file where I have used jinja2. I want to display results that equal to the city chosen on the main page (it is a form). Also, I have entities in the database, which appear when going onto the google datastore local extension

the get_deals code is:

    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

Below are my scripts:

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)

And my html page that is not displaying the results is:

<!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>
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1 Answer

  1. Editorial Team

    1. In your code you are not calling get_deals function. I would suggest you to take get_deals() out of get() and call it like

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

      because it is a good design.

      EDIT
      Change self.get_deals() to ‘get_deals()` if you do not plan to do so.

    2. You use deals in your html but is not specifying its value when calling from the server.
      Probably what you want to do is 

      {% for deal in get_deals %}    
    {{ deal }}  
{% endfor %}
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