mongodb and mogoid in rails 4


Install Mongodb On Ubuntu

Install Mogoid gem in rails 4:
In Gem file:


gem 'mongoid', github: 'mongoid/mongoid'
gem 'bson_ext'

Run this command:

bundle update

To generate mongoid.yml file

rails g mongoid:config

Detailed reference

Rails Cast

Replacing Active Record in rails app:

Remove/comment out you sql gem from gem file for instance sqlite3, mysql, pgsql.

#gem 'sqlite3'

In “app/config/mongoid.yml” comment out this line

# consistency: :eventual

and replace with this line

consistency: :strong

In config/application.rb comment out this line

# require 'rails/all'

and add these lines


require "action_controller/railtie"
require "action_mailer/railtie"
#require "active_resource/railtie" #uncomment if you want to use active_resource
require "sprockets/railtie"

In config/environments/development.rb comment out this line, as it was used by active record not in mongoid

# config.active_record.migration_error = :page_load
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