# Method in Model **URL:** \ **Category:** Rails\ **Created:** [September 14, 2006, 12:40am UTC](https://www.ruby-forum.com/t/method-in-model/68627 "2006-09-14T00:40:32Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![joe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/b9e5f3/32.png) [@joe](https://www.ruby-forum.com/u/joe)\ **Post date:** [September 14, 2006, 12:40am UTC](https://www.ruby-forum.com/t/method-in-model/68627/1 "2006-09-14T00:40:32Z")
I am runnning through the Agile web development with Rails book…and have come across the following problem. Everything has been going great until I get the point where I am supposed to be adding a price\_total to the add\_to\_cart.rhtml. Now when I add to the cart I get undefined method “price\_total” for #Cart:blahblah. I thought maybe I mistyped something, so I went and checked everything again and again, same problem. I tried everything I could think of, tried rake db:sessions:clear, same problem. Tried putting the method price\_total somewhere else…same problem. Finally just for fun (really didn’t expect it to fix it) I restarted webrick. THIS FIXED IT! I have now worked out that if I change the method name (both in the model and the rhtml) it will not assosciate until AFTER I restart webrick. Also, if I add a new method it will not be accessible until I restart webrick. Additionally, if I create a method, interact with the website, then delete the method from the model the information from that deleted method will still show up on the website until AFTER I restart webrick. It seems that any change I make to the model doesn’t happen until after I restart webrick. Any ideas on this? In case it matters the cart model is just ‘class Cart’ not something like ‘class Cart \< Somethingelse’ ---
**Author:** ![joe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/b9e5f3/32.png) [@joe](https://www.ruby-forum.com/u/joe)\ **Post date:** [September 14, 2006, 12:58am UTC](https://www.ruby-forum.com/t/method-in-model/68627/2 "2006-09-14T00:58:46Z")
Hi Joe, It sounds like you’re running WebRICK in “production” mode, not “development” mode… in “production” mode, Rails will only load your model classes _once_, whereas in “development” mode, it will reload your model classes on each and every HTTP request… check your environment (“RAILS\_ENV”) and/or your config files, and ensure it’s set to “development” mode. Good luck, Peter ---
**Author:** ![joe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/b9e5f3/32.png) [@joe](https://www.ruby-forum.com/u/joe)\ **Post date:** [September 14, 2006, 1:07am UTC](https://www.ruby-forum.com/t/method-in-model/68627/3 "2006-09-14T01:07:12Z")
Peter Vandenberk wrote: > Hi Joe, > > It sounds like you’re running WebRICK in “production” mode, not > “development” mode… in “production” mode, Rails will only load your > model classes _once_, whereas in “development” mode, it will reload > your model classes on each and every HTTP request… check your > environment (“RAILS\_ENV”) and/or your config files, and ensure it’s > set to “development” mode. > > Good luck, > > Peter > Someone recommended that on an irc channel I was on, but it was hard to > follow the conversation because like 20 people were having their own > conversation. I wasn’t sure how to check if it was in production/development so I just looked at the logs and development log was long where production was completely empty. How should I be checking which mode it is in? ---
**Author:** ![joe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/b9e5f3/32.png) [@joe](https://www.ruby-forum.com/u/joe)\ **Post date:** [September 14, 2006, 1:17am UTC](https://www.ruby-forum.com/t/method-in-model/68627/4 "2006-09-14T01:17:13Z")
Ok I have done ruby script/console and typed RAILS\_ENV and it came back with development…Was this the way to do it? ---
**Author:** ![joe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/b9e5f3/32.png) [@joe](https://www.ruby-forum.com/u/joe)\ **Post date:** [September 14, 2006, 1:26am UTC](https://www.ruby-forum.com/t/method-in-model/68627/5 "2006-09-14T01:26:54Z")
I have also just included \<%= RAILS\_ENV.to\_s %\> into an rhtml and it shows development when I refresh the page. Any other ideas?? ---
**Author:** ![joe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/b9e5f3/32.png) [@joe](https://www.ruby-forum.com/u/joe)\ **Post date:** [September 14, 2006, 5:10am UTC](https://www.ruby-forum.com/t/method-in-model/68627/6 "2006-09-14T05:10:00Z")
Peter Vandenberk wrote: > > That syntax is now deprecated in favor of adding the following > > declaration in your model file: > > > > include Reloadable > > See also: [http://clarkware.com/cgi/blosxom/2006/03/28](http://clarkware.com/cgi/blosxom/2006/03/28) > > Let us know how it goes! 🙂 > > Peter That worked GREAT! This is probably something they should have included in the book…Well, I guess it being a “beta book” so far maybe they just haven’t caught it. Dunno…but that worked great, I can now add to that model on the fly without restarting. Thanks a lot! I’m going to let them know on the pragprog site. ---
**Author:** ![joe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/b9e5f3/32.png) [@joe](https://www.ruby-forum.com/u/joe)\ **Post date:** [September 15, 2006, 3:50am UTC](https://www.ruby-forum.com/t/method-in-model/68627/7 "2006-09-15T03:50:55Z")
Thank you sooooo much for asking this question. I have had the exact same problem today and have wasted about 6 hours including all the frustration. Also, thanks to all who have taken the time to answer. Phil ---
**Author:** ![joe](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/b9e5f3/32.png) [@joe](https://www.ruby-forum.com/u/joe)\ **Post date:** [September 14, 2006, 1:38am UTC](https://www.ruby-forum.com/t/method-in-model/68627/8 "2006-09-14T01:38:49Z")
Hi Joe, On 14 Sep 2006, at 00:17, Joe wrote: > Ok I have done ruby script/console and typed RAILS\_ENV and it came > back > with development…Was this the way to do it? Yes, that’s one way to do it … also, as per your previous post, if the development.log is growing but the production.log stays empty, then Rails is definitely running in development mode. I just re-read your original post in more detail, and noticed your very last comment, which I missed the first time around: > In case it matters the cart > model is just ‘class Cart’ not something like ‘class Cart \< > Somethingelse’ Yes, it matters quite a lot, actually. Rails will only reload AR model classes, ie. classes that inherit from ActiveRecord::Base… for non-ActiveRecord model classes, you need to help Rails out a bit: > If you want Rails to reload a model that isn’t a subclass of > ActiveRecord::Base, you used to add the following declaration in a > controller: > > model :my\_model > That syntax is now deprecated in favor of adding the following > declaration in your model file: > > include Reloadable See also: [http://clarkware.com/cgi/blosxom/2006/03/28](http://clarkware.com/cgi/blosxom/2006/03/28) Let us know how it goes! 🙂 Peter