One day at a time

http://railsexpress.de/blog/articles/2005/11/18/components-may-not-be-evil-but-they-sure-can-be-slow Becareful when you use Ruby components. When it goes back to the controller, it may run throught some filters and slow down the application.

Here are a set of articles for RoR scaling.

1. The adventures of scaling, Stage 1
2. Q&A: The adventures of scaling, Stage 1
3. The adventures of scaling, Stage 2
4. The adventures of scaling, Stage 3
5. The adventures of scaling, Stage 4
6. Scaling Rails with Apache 2.2, mod_proxy_balancer and Mongrel

Very good articles.

By the way, it said:

If you are using Dreamhost to deploy Ruby On Rails, I suggest you to look into:

Webistrano – http://labs.peritor.com/webistrano

This is a web UI to make PHP, rails deploy a lot easier. 5 stars!

Also, in case you change the source code in Dreamhost and want Dreamhost to reload the file, you see to do the following:

1. SSH to your Dreamhost account
2. echo “” > YOUR_DEPLOY_DIR_NAME/tmp/restart.txt
3. This is trigger dreamhost’s Passenger to restart your files. Also, at the end, it will delete the tmp/restart.txt file.

I am converting an old Ruby on Rails application to Rails 2.2.2 because the app does not work for dreamhost anymore. Dreamhost rails version is 2.2.2.

It is painful. A lot of plugin does not work. For example, I was using acts_as_authenticated plugin. However, it is no longer support. I need to convert it to restful_anthuenication plugin. The database structure is more or less the same but some of the internal stuff needs to be changed.

For example, after I add the plugin, I keep getting undefined method logged_in in the view. This is driving me crazy because I am using the logged_in method in the view to display whether the user is logged in or not. If login, I will display a logout button. If logout, I will display a login button. Since rails complain about logged_in method is not defined, I cannot display the view.

After a lot of searchs, I find it. It is n vendor/plugins/restful_authentication/generators/authenticated/templates/authenticated_system.rb:

# Inclusion hook to make #current_<%= file_name %> and #logged_in?
# available as ActionView helper methods.
def self.included(base)
base.send :helper_method, :current_<%= file_name %>, :logged_in?, :authorized? if base.respond_to? :helper_method
end

The key thing is that in your app/controllers/application.rb you need to add this:

include AuthenticatedSystem

oh well… move to next rail 2.2.2 migration problem..

My rails app is using the old version of rubyforge.

When I start the app using ./script/server. It complains about the rubyforge as:

/usr/lib/ruby/site_ruby/1.8/rubygems.rb:142:in `activate’: can’t activate rubyforge (= 0.4.5, runtim
e), already activated rubyforge-1.0.1 (Gem::Exception)
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require’
from /usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/dependencies.rb:495:
in `require’
from /usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/dependencies.rb:342:
in `new_constants_in’
from /usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/dependencies.rb:495:
in `require’
from /usr/lib/ruby/1.8/soap/streamHandler.rb:62
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require’
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require’
from /usr/lib/ruby/gems/1.8/gems/activesupport-1.4.4/lib/active_support/dependencies.rb:495:
in `require’
… 65 levels…
from /usr/lib/ruby/gems/1.8/gems/rails-1.2.5/lib/commands/server.rb:39
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require’
from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require’
from ./script/server:3

What you need to do is uninstall rubyforge and reinstall it as:

[root@pony ]# gem uninstall rubyforge

Select gem to uninstall:
1. rubyforge-0.4.4
2. rubyforge-0.4.5
3. rubyforge-1.0.0
4. rubyforge-1.0.1
5. All versions
> 5
Successfully uninstalled rubyforge-0.4.4
Successfully uninstalled rubyforge-0.4.5
Successfully uninstalled rubyforge-1.0.0

You have requested to uninstall the gem:
rubyforge-1.0.1
hoe-1.5.0 depends on [rubyforge (>= 0.4.4)]
hoe-1.5.1 depends on [rubyforge (>= 0.4.4)]
hoe-1.5.3 depends on [rubyforge (>= 1.0.0)]
hoe-1.8.1 depends on [rubyforge (>= 1.0.0)]
hoe-1.8.2 depends on [rubyforge (>= 1.0.1)]
hoe-1.3.0 depends on [rubyforge (>= 0.4.4)]
hoe-1.7.0 depends on [rubyforge (>= 1.0.0)]
If you remove this gems, one or more dependencies will not be met.
Continue with Uninstall? [Yn]
Successfully uninstalled rubyforge-1.0.1
[root@pony ]# gem install rubyforge
Successfully installed rubyforge-1.0.1
1 gem installed
Installing ri documentation for rubyforge-1.0.1…
Installing RDoc documentation for rubyforge-1.0.1…

I just updated to rails 2.1.2 and see this error:

undefined method `init_gettext’ for ApplicationController:Class

To resolve it.

1. make sure you have the latest gettext gems.
2. if it does not help, try add this to the first line of your app/controllers/application.rb
   • require ‘gettext/rails’

If you cannot do “gem install mysql”, it returns:

/usr/local/bin/ruby extconf.rb install mysql
checking for mysql_query() in -lmysqlclient… no
checking for main() in -lm… yes
checking for mysql_query() in -lmysqlclient… no
checking for main() in -lz… yes
checking for mysql_query() in -lmysqlclient… no
checking for main() in -lsocket… no
checking for mysql_query() in -lmysqlclient… no
checking for main() in -lnsl… yes
checking for mysql_query() in -lmysqlclient… no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.

Try this:

gem install mysql — \
> –with-mysql-include=/usr/include/mysql \
> –with-mysql-lib=/usr/lib/mysql