Getting Started

install MongoDB from their official repository

$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10
$ sudo echo "deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen" | tee -a /etc/apt/sources.list.d/10gen.list
$ sudo apt-get -y update
$ sudo apt-get -y install mongodb-10gen

Make sure you installed MongoDB, running the commands below will show corresponging infomations

 

$ mongod
$ mongo
MongoDB shell version: 2.4.10
connecting to: test
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
        http://docs.mongodb.org/
Questions? Try the support group
        http://groups.google.com/group/mongodb-user
>

Generate Rails application and change Gemfile

# Generate Rails application
$ rails new myapp --skip-active-record

# Change Gemfile
# remove 
# Use sqlite3 as the database for Active Record
gem 'sqlite3'

# add
# mongodb
gem 'mongoid', git: 'git://github.com/mongoid/mongoid.git'

Generate the Mongoid configuration file

$ rails g mongoid:config