After installing RVM, Ruby 1.9.2dev, and Rails 3.0.0.beta4, I followed the instructions here to update a bunch of files (assuming you are running MongoDB locally):
config/initializers/mongo.rb
MongoMapper.connection = Mongo::Connection.new('localhost', 27017)
MongoMapper.database = "#myapp-#{Rails.env}"
if defined?(PhusionPassenger)
PhusionPassenger.on_event(:starting_worker_process) do |forked|
MongoMapper.connection.connect_to_master if forked
end
end
Gemfile:
source 'http://rubygems.org'
gem 'rails', '3.0.0.beta4'
gem 'mongo_mapper'
gem 'rails3-generators'
config/application.rb
(only first 8 lines shown, not change to the rest of the file)
require File.expand_path('../boot', __FILE__)
#require "rails/all"
require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
require "rails/test_unit/railtie"
Then, I went on to create a model, and to do that I used kristianmandrup's rails3-generators gem:
sudo gem install rails3-generators
rails generate model Book --skip-migration --orm=mongomapper
Edit this model to contain at least one MongoDB key:
class Book
include MongoMapper::Document
key :title, String
key :author, String
timestamps!
# Validations :::::::::::::::::::::::::::::::::::::::::::::::::::::
# validates_presence_of :attribute
# Assocations :::::::::::::::::::::::::::::::::::::::::::::::::::::
# belongs_to :model
# many :model
# one :model
# Callbacks :::::::::::::::::::::::::::::::::::::::::::::::::::::::
# before_create :your_model_method
# after_create :your_model_method
# before_update :your_model_method
end
We'll need a controller to access the Book model:
rails generate controller Book
This creates an empty controller file. Edit book_controller.rb to look like this:
class BookController < ApplicationController
def index
@books = Book.all
end
end
Create a view for this controller and action in app/views/book/index.erb:
<% if notice %>
<p id="notice"><%= notice %></p>
<% end %>
<h1>Books</h1>
<% @books.each do |book| %>
<div class="entry">
<h3><%= book.title %></h3>
</div>
<% end %>
Add the Book routes in the routes.rb file:
Inspector::Application.routes.draw do |map|
resources :books
end
Start the server to see if the application works so far:
rails server
Navigate your browser to http://localhost:3000/books/index. If you get a blank page with "Books" only displayed, then you are doing well, no worries. There are no errors, but also there are no records to display. The easiest/quickest way to add some books at this point is to use the console. Type "rails console", and add a couple of books:
book1 = Book.create(:title => "title 1", :author => "author 1")
=> true
book2 = Book.create(:title => "title 2", :author => "author 2")
=> true
Finally, make sure the rails server is running, and try to access http://localhost:3000/books. If all went well, the two entries we just made will be listed.
PS. Good resources on this subject:
http://www.mongodb.org/display/DOCS/MongoDB+Data+Modeling+and+Rails
http://blog.bitzesty.com/mongodb-with-mongomapper-and-ruby-on-rails
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