Question

I need to have collections such as:

• client1.users
• client1.images
• client2.users
• client2.images

MongoDB supports Collection namespacing. http://www.mongodb.org/display/DOCS/Using+a+Large+Number+of+Collections

Using the Ruby driver for MongoDB that won’t be a problem but I want to have an ODM.

How can I use namespace collections with Mongoid?

Answer 1

You can put your models into namespaces with Mongoid. You will have to specify the fully qualified class_name in any associations that you define, e.g.

module Client1
  class Image
    include Mongoid::Document
    referenced_in :user, :inverse_of => :images, :class_name => 'Client1::User'
  end

  class User
    include Mongoid::Document
    references_many :images, :inverse_of => :user, :class_name => 'Client1::Image'
  end
end

Mongoid will map these two classes to MongoDB collections client1_images and client1_users respectively.