Hello,
I just finished a simple voting feature for my app:
class VoteHandler(webapp.RequestHandler):
def get(self, id):
id = int(id)
item = Item.get_by_id(id)
user = users.get_current_user()
if user:
greeting = ("%s (<a href='%s'>sign out</a>)" %
(user.nickname(),
users.create_logout_url(self.request.uri)))
item.vote +=1
item.put()
if self.request.referrer == 'http://sarah-for-
president.appspot.com/newest':
self.redirect('/newest')
elif self.request.referrer == 'http://sarah-for-
president.appspot.com/hot':
self.redirect('/hot')
else:
self.redirect("/")
else:
greeting = ("<a href='%s'>Sign in with your Google account
or register</a>." %
cgi.escape(users.create_login_url(self.request.uri)))
self.response.out.write("""%s""" % greeting)
As you can see I only check if the voter is a user and add +1.
Now I want to add a feature so that the same user cannot vote for the
same article more than once.
What is the best way to handle this?
I checked the source of Hacker News view-source:http://
news.ycombinator.com/news and I see that they handle it with
JavaScript. They hide the arrows with something like
// hide arrows
byId('up_' + item).style.visibility = 'hidden';
byId('down_' + item).style.visibility = 'hidden';
This is my model:
class Item(db.Model):
title = db.StringProperty()
url = db.StringProperty()
date = db.DateTimeProperty(auto_now_add=True)
author = db.UserProperty()
vote = db.IntegerProperty(default=1)
And this is the link <a href="/vote/%s"> ^ </a> with a caret (for up
arrow) that sends the request to VoteHandler.
I put the 2 relevant handlers in Pastebin:
VoteHandler: http://pastebin.com/0zCZqHia
Hot (has the vote link): http://pastebin.com/YFc5CwrW
Thanks for your advice.
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