Mongoid is an ODM (Object-Document-Mapper) framework for MongoDB in Ruby. Mongoid differs from other mapping frameworks in that it constrains the models into behaving in a manner appropriate for a document database. That is to say there are no relationships between documents in the underlying datastore. If a relationship is set up in the Model the child models are automatically embedded within the parent document in the database. The concept of a foreign key relationship to another Document does not exist, as that is design and thinking for a relational database, not a document database. Mongoloid does however provide all the ActiveRecord style functionality you need, with the difference that it stores all associations within the parent document.
Mongoid is developed against Ruby 1.8.6, 1.8.7, 1.9.1
Mongoid in Action
Example of a simple domain model:
class Person < Mongoid::Document fields :title has_many :addresses has_one :name end class Address < Mongoid::Document fields \ :street, :city, :state, :post_code belongs_to :person end class Name < Mongoid::Document fields \ :first_name, :last_name end
Create a new Document:
Person.create(:title => "Esquire")
Save a Document:
Delete a Document:
Update a Document:
person.update_attributes(:title => "Sir")
Search for a Document in the database:
Person.find(:all, :title => "Esquire") Person.find(:first, :title => "Esquire")
Paginate Document search results:
Person.paginate(:title => "Esquire", :page => 1, :per_page => 20)
Mongoid supports all validations provided by Jay Fields’ Validatable gem.
For more information please see the Validatable documentation.
Copyright © 2009 Durran Jordan
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Durran Jordan: durran at gmail dot com