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Multiple versions of ruby on ubuntu
Jun 23rd
Three-Four days ago I was in a situation where I need to have multiple versions of ruby and rubygems on my ubuntu machine. I was lucky, I found an awesome article http://blog.michaelgreenly.com/2008/08/multiple-versions-of-ruby-on-ubuntu-2.html. This really solved my problem, Many thanks to Michael Greenly.
Taskit: Another task scheduler for rails
May 21st
While searching something I found and interesting plugin ‘Taskit‘, which I want to test for sure in production/staging when ever I get the chance.
Anybody tried it already?
Printing large image diagrams generated by RailRoad
Mar 23rd
I use RailRoad for generating Ruby on Rails diagrams, but always wish I could print those diagrams. Generally diagrams are too big to print on a single A4 size paper and I didn’t find any tool to print larger images in parts so that I can join them. If I print the image generated by RailRoad on single page, it of no use as it is hardly readable.
Fortunately, two days ago I found something which resolved this issue. It is a linux command and print a particular image on four pages. Here is that command:
lp -o scaling=200 models.png
Hassle free installation of rails stack on debian based system
Feb 23rd
Want to install rails stack on a machine? Just follow these steps. It will setup a rails stack(Apache + passenger + mysql + ruby + rubygems + common gems + git) on any server(debian based)
- apt-get update
- apt-get upgrade -y
- apt-get -y install build-essential libssl-dev libreadline5-dev zlib1g-dev
- apt-get -y install mysql-server libmysqlclient15-dev mysql-client
- apt-get -y install ruby ruby1.8-dev irb ri rdoc libopenssl-ruby1.8
- install rubygems manually:
- download rubygems form rubyforge, >=1.3
- unzip files
- ruby setup.rb
- Check that gem command is in path. Sometimes ‘gem1.8′ is available but ‘gem’ not. In that case copy /usr/bin/gem1.8 to /usr/bin/gem using “cp /usr/bin/gem1.8 /usr/bin/gem”
- apt-get -y install libmagick9-dev
- apt-get -y install imagemagick
- apt-get -y install postfix mailx
- apt-get -y install apache2
- apt-get -y install apache2-prefork-dev
- wget http://webonrails.com/wp-content/plugins/download-monitor/download.php?id=7
- ruby install_gems.txt
- passenger-install-apache2-module
-
Download git from git-scm.com
- Unzip files
- ./configure –without-tcltk
- make -j 2
- make install
You are all set now, go deploy you rails app. I have tested it on linode(ubuntu8.10), slicehost(ubuntu 8.10), should work for you too
Edge rails: ActiveRecord::Base.each and ActiveRecord::Base.find_in_batches for batch processing
Feb 23rd
You guys must faced a situation when you need to process large number of records, for example sending newsletters. Then you must have done some sort of batch processing to save it eating up all of your memory. This feature is committed to rails core by DHH.
Now you can do something like User.each and User.find_in_batches.
Please refer here for more details.
rake -T does not list my custom rake task
Feb 13th
This is just a tip, may be you guys are already aware of it.
Sometimes I wonder why my custom rake task doesn’t appear in rake -T list, however it runs well. I just noticed that if I do not specify description for a task then that particular rake task does not appear in the task list.
Tip: Open DB shell/console from rails root dir
Jan 29th
Just a quick tip you might be using this already.
If you guys want to open your app’s DB shell. Then you can use rails utility ‘dbconsole’ by issuing “script/dbconsole” from rails root directory.
It will ask for DB password, and open your db shell.
If you use sake, you may like following sake task:
desc 'Launches the database shell using the values defined in config/database.yml'
task 'db:shell', :needs => [ 'environment' ] do
config = ActiveRecord::Base.configurations[(RAILS_ENV or "development")]
command = ""
case config["adapter"]
when "mysql" then
(command << "mysql ")
(command << "--host=#{(config["host"] or "localhost")} ")
(command << "--port=#{(config["port"] or 3306)} ")
(command << "--user=#{(config["username"] or "root")} ")
(command << "--password=#{(config["password"] or "")} ")
(command << config["database"])
when "postgresql" then
puts("You should consider switching to MySQL or get off your butt and submit a patch")
else
(command << "echo Unsupported database adapter: #{config["adapter"]}")
end
system(command)
end
quick_scopes: Rails plugin to automatically add some quick named_scopes to your models
Jan 29th
Today I came across a new plugin named quick_scopes, and thought you guys might be interested to give it a try. Checkout http://github.com/internuity/quick_scopes/tree/master
ActionMailer Error: hostname was not match with the server certificate
Jan 28th
You guys may have stuck with following error while using ActionMailer with Rails 2.2.2 .
OpenSSL::SSL::SSLError (hostname was not match with the server certificate):
/usr/lib/ruby/1.8/openssl/ssl.rb:123:in `post_connection_check'
/usr/lib/ruby/1.8/net/smtp.rb:582:in `tlsconnect'
/usr/lib/ruby/1.8/net/smtp.rb:562:in `do_start'
/usr/lib/ruby/1.8/net/smtp.rb:525:in `start'
/vendor/rails/actionmailer/lib/action_mailer/base.rb:671:in `perform_delivery_smtp'
/vendor/rails/actionmailer/lib/action_mailer/base.rb:526:in `__send__'
/vendor/rails/actionmailer/lib/action_mailer/base.rb:526:in `deliver!'
/vendor/rails/actionmailer/lib/action_mailer/base.rb:392:in `method_missing'
/app/controllers/users_controller.rb:40:in `send_email_to_confirm_user'
If you use postfix, then you fix it quickly by disabling tls by setting “smtpd_use_tls=no” in /etc/postfix/main.cf .
Remember to restart postfix and rails app server.
Ruby script to install bulk gems
Dec 8th
Recently I had to setup many rails servers and for that I had to install some gems again and again by issuing traditional “gem install xyz” command several times. This was actually very annoying.
To avoid issuing “gem install xyz” command again and again, while setting up new machine, I wrote a utility script in ruby. This script read a list of gems and install them by avoiding ri and rdoc installation for gem.
This script saved lots of my time. Here is the Ruby script to install bulk gems, if you would like to give it a try.
Download this script and save as .rb. Run this script by “ruby install_gems.rb” and follow the instructions on screen.