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    copied!<p>In order to get mongo_mapper working in Rails (tested under Rails 3.1, should work in Rails 3.0.x as well), you have to follow these steps:</p> <ol> <li><p>In Gemfile, add the mongo_mapper and bson gem:</p> <pre><code>gem 'mongo_mapper' gem 'bson_ext' </code></pre></li> <li><p>Run bundle install</p></li> <li><p>In the config/ directory, create a mongo.yml file like this one:</p> <pre><code># config/mongo.yml defaults: &amp;defaults host: 127.0.0.1 port: 27017 development: &lt;&lt;: *defaults database: db_development username: user password: password test: &lt;&lt;: *defaults database: db_test # set these environment variables on your prod server production: &lt;&lt;: *defaults database: username: password: </code></pre></li> <li><p>In the config/initializers directory, create a mongo.rb file like this:</p> <pre><code> # config/initializers/mongo.rb #include MongoMapper db_config = YAML::load(File.read(File.join(Rails.root, "/config/mongo.yml"))) # if db_config[Rails.env] &amp;&amp; db_config[Rails.env]['adapter'] == 'mongodb' mongo = db_config[Rails.env] MongoMapper.connection = Mongo::Connection.new(mongo['host'] || 'localhost', mongo['port'] || 27017, :logger =&gt; Rails.logger) MongoMapper.database = mongo['database'] if mongo['username'] &amp;&amp; mongo['password'] MongoMapper.database.authenticate(mongo['username'], mongo['password']) end end # Used for image uploads # CarrierWave.configure do |config| # mongo = db_config[Rails.env] # config.grid_fs_database = mongo['database'] # config.grid_fs_host = mongo['host'] || 'localhost' # config.grid_fs_access_url = "gridfs" # config.grid_fs_username = mongo['username'] # config.grid_fs_password = mongo['password'] # end # It's also possible to define indexes in the the model itself; however, # a few issues are being worked out still. This is a temporary solution. # Comment.ensure_index([["story_id", 1], ["path", 1], ["points", -1]]) # MongoMapper.ensure_indexes! # Handle passenger forking. # if defined?(PhusionPassenger) # PhusionPassenger.on_event(:starting_worker_process) do |forked| # MongoMapper.database.connect_to_master if forked # end # end if defined?(PhusionPassenger) PhusionPassenger.on_event(:starting_worker_process) do |forked| MongoMapper.connection.connect if forked end end </code></pre></li> <li><p>Start the mongod server before starting the rails server and enjoy!</p></li> </ol>
 

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