Firstly, a word of warning. You will need a command prompt or terminal open in order to upgrade RailsCollab.
It would also be advisable to get yourself up to scratch with the finer details of Ruby on Rails deployment if you are planning on upgrading from ActiveCollab.
The first thing you should do is migrate the database schema to ensure RailsCollab's models continue to function. This can be achieved by running the following command:
rake db:migrate
Next you should reload your configuration schema, in case any new configuration options have been added. This can be accomplished by running the following commands:
rake db:railscollab:reload_config
If you are updating from version 0.8 beta or lower, please note that Forms have been removed.
If you are updating from alpha 2 and below, note that the preferred method for updating configuration options is now from the administration interface.