http://davidcramer.disqus.com/enFri, 02 Apr 2010 11:25:14 -0000http://cramer.io//django/345/tips-for-scaling-a-web-app.html#comment-42871127<p>Hi David, I wondered if you'd mind sharing the code from your has_changed method?</p>jamiepittockFri, 02 Apr 2010 11:25:14 -0000http://cramer.io//django/345/tips-for-scaling-a-web-app.html#comment-3664757<p>What is Honza's solution?</p>kevinMon, 10 Nov 2008 11:53:09 -0000http://cramer.io//django/345/tips-for-scaling-a-web-app.html#comment-3641140<p>In some situations, yes. We happen to have more than just a username and user id though. We use it to pass other dynamic information pages as well. But the solution is far from silly, and it's a lot more common than you may think.</p>David CramerSun, 09 Nov 2008 00:03:26 -0000http://cramer.io//django/345/tips-for-scaling-a-web-app.html#comment-3641102<p>Honza's alternative to the silly javascript solution that he suggested at Djangocon is much superior.</p>AnonymousSat, 08 Nov 2008 23:58:06 -0000http://cramer.io//django/345/tips-for-scaling-a-web-app.html#comment-3627618<p>Yes there are, but there is no need to use signals (extra overhead) when it's a simple task like this.</p>David CramerSat, 08 Nov 2008 16:30:02 -0000http://cramer.io//django/345/tips-for-scaling-a-web-app.html#comment-3627297<p>RE: Denormalisation, there are Django plugins which accomplish the denormalisation you are doing by hand automatically.</p><p>If you do things manually, you're likely to end up with inconsistent data at some point.. django has a signals/slots architecture built into core which you might as well use to do this all automagically.</p><p><a href="http://www.aeracode.org/2008/9/14/denormalisation-follies/" rel="nofollow noopener" target="_blank" title="http://www.aeracode.org/2008/9/14/denormalisation-follies/">http://www.aeracode.org/200...</a></p>RJ RyanSat, 08 Nov 2008 15:55:35 -0000http://cramer.io//django/345/tips-for-scaling-a-web-app.html#comment-3626281<p>User's name (as in “Logged in as David”) can also be stored into the browser's cookie and fetched from the cookie using javascript, such that the Ajax call would be called only if the user name doesn't exist in the cookie.<br>This way, you could omit the ajax call in most cases and minimize the load on your server even more.</p>PeterSat, 08 Nov 2008 13:58:25 -0000http://cramer.io//django/345/tips-for-scaling-a-web-app.html#comment-3620544<p>Very nice article. The tip about using Javascript for the variable part of a page is just great. As all really good ideas, seems obvious in retrospect. Thanks a lot for sharing.</p>Fernando CorreiaSat, 08 Nov 2008 04:13:31 -0000http://cramer.io//django/345/tips-for-scaling-a-web-app.html#comment-3619128<p>On initialization (__init__) you can store the state of things. I may throw up an example here in a few days, the code above doesn't actually match what we use, but it was a quick clean example :)</p>David CramerSat, 08 Nov 2008 02:08:16 -0000http://cramer.io//django/345/tips-for-scaling-a-web-app.html#comment-3619084<p>Thanks a lot for these tips. Also, I'd be curious to see what that "has_changed" method does. For example, how can you track previous states of the 'city' value?</p>Julien PhalipSat, 08 Nov 2008 02:03:37 -0000