install specific version of rails

sudo gem install -v=2.2.2 rails --include-dependencies

How to load a specific version of gem

For some reason if you want to use specific version of gem installed on your system:

require 'rubygems'
gem 'activesupport', '=1.4.2'
require 'active_support'

How to check if CRON service is running

You can make sure the cron service is running by running 'sudo /sbin/service crond restart'.

scp GUI for Mac OS

Fugu gives a nice GUI for scp. Very easy to use.

Invalid command 'SSLEngine', perhaps misspelled or defined by a module not included in the server configuration

This error is caused if mod_ssl is not installed. On Cent OS : sudo yum install mod_ssl to get SSL working.

Getting MySQL to work with Rails 2.2.2 on Mac OS 10.5.6

Weird errors: dlsym(0x256ee10, Init_mysql): symbol not found - /usr/local/lib/ruby/gems/1.8/gems/mysql-2.7/lib/mysql.bundle

It turned out I had installed the x86_64 version of MySQL and it does not work with Ruby.

[BLATANT COPY/PASTE BEGIN]
0. In Terminal: ls -l /usr/local ## Showed that mysql was pointing to a PowerPC version instead of i686
1. EXPORT ALL DATABASES FROM CURRENT MYSQL
2. Downloaded MySQL 5.1.30 (I am on OS X 10.4.11 so I used Mac OS X 10.4 (x86))
3. Ran installation package (be sure to see the README first about stopping current server, etc)
4. In Terminal: sudo gem uninstall mysql
5. In Terminal: sudo gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config
6. Started up my app's script/server
[BLATANT COPY/PASTE END]

Source: RailsForum

Captcha in Rails 2.1.2

Simple Captcha plugin by Sur Max works great. Few things that has made life easier:

1. You can now install the RMagick on Linux and Mac OS X using gem install rmagick.
2. Just follow the readme file that comes with the plugin and things will work fine.

It still is in SVN repository. It's ok, just install it.