Rails with Mongo Mapper

Question

This is turning out to be the worst day for learning rails. Already failed to connect and configure to sqlite3, mysql databases I turned to mongo mapper and facing the same issues. When I try to start the rails server I get the following:

/usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:239:in `require': no such file to load -- mongo_mapper (LoadError)

I have already installed mongo_mapper gem but when I do 'which mongo_mapper' it does not return anything.

Here is my mongo_config.rb file placed inside the initializers folder:

require "rubygems"
require "mongo_mapper"

MongoMapper.database = "blog-#{Rails.env}"

UPDATE 1:

I changed to the following:

require "rubygems"
include MongoMapper

MongoMapper.database = "blog-#{Rails.env}"

And now I get the following error:

   /Users/azamsharp/Projects/railsprojects/blog/config/initializers/mongo_config.rb:2: uninitialized constant MongoMapper (NameError)

Instead of giving up on sqlite3 and mysql why dont you give those a try again. They are the simplest of databases and NoSQL just adds more complexity to the mix. Just a suggestion. — Devin M, Jun 02 '11 at 21:28
I have been trying to get the rails server to start for the last 5 hours and still no success. I am using Rails 3.0.7. Here is the thread => http://stackoverflow.com/questions/6217602/trouble-getting-the-rails-server-started — azamsharp, Jun 02 '11 at 21:39
Yagooar's answer below solved my problem, don't you want to accept it as a solution? — Laszlo T, Sep 22 '13 at 19:06

score 4 · Answer 1 · answered Jun 03 '11 at 00:20

You must use bundler with rails 3. don't try to not use it. add the following to your Gemfile

source 'http://gemcutter.org'
source 'http://rubygems.org'

gem "rails", "3.0.7"
gem 'bson', "1.1.1"
gem 'bson_ext', "1.1.1"
gem 'mongo_mapper'

then run

bundle install

then rails server will work

score 4 · Answer 2 · answered Oct 01 '11 at 14:13

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:

In Gemfile, add the mongo_mapper and bson gem:
```
gem 'mongo_mapper'
gem 'bson_ext'
```
Run bundle install

In the config/ directory, create a mongo.yml file like this one:

# config/mongo.yml

defaults: &defaults
  host: 127.0.0.1
  port: 27017

development:
  <<: *defaults
  database: db_development
  username: user
  password: password

test:
  <<: *defaults
  database: db_test

# set these environment variables on your prod server
production:
  <<: *defaults
  database:
  username:
  password:

In the config/initializers directory, create a mongo.rb file like this:

 # config/initializers/mongo.rb

 #include MongoMapper

 db_config = YAML::load(File.read(File.join(Rails.root, "/config/mongo.yml")))
 #
 if db_config[Rails.env] && db_config[Rails.env]['adapter'] == 'mongodb'
   mongo = db_config[Rails.env]
   MongoMapper.connection = Mongo::Connection.new(mongo['host'] || 'localhost',
                                              mongo['port'] || 27017,
                                             :logger => Rails.logger)
   MongoMapper.database = mongo['database']

   if mongo['username'] && 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

Start the mongod server before starting the rails server and enjoy!

+1 Nice one. But is it me, or is the `mongo.yml` configuration missing an `adapter: mongodb` configuration? I put it under `defaults:`, personally. — zelanix, Oct 24 '14 at 14:20

score -1 · Answer 3 · answered Jun 02 '11 at 21:33

-1

Try removing the require lines and replace them with include MongoMapper

answered Jun 02 '11 at 21:33

Devin M

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I am not using bundle install I installed the mongo_mapper gem manually using sudo gem install mongo_mapper. – azamsharp Jun 02 '11 at 21:50
2

Why are you not using bundler? – Devin M Jun 02 '11 at 22:08

Rails with Mongo Mapper

3 Answers3