• Fast
• Scalable
• Flexible

 #mongo

validates_associated :episodes
validates :episodes, associated: true
validates_format_of :title, with: /\A\w+\Z/
validates :title, format: { with: /\A\w+\Z/ }

 # Set the field values in the document.
Person.new(first_name: "Jean-Baptiste", middle_name: "Emmanuel")
person.attributes = { first_name: "Jean-Baptiste", middle_name: "Emmanuel" }
person.write_attributes(
  first_name: "Jean-Baptiste",
  middle_name: "Emmanuel"
)

 class Foo
  include Mongoid::Document
  field :bar
end
 
foo = Foo.new(:bar => "baz")
foo.to_json # => { bar: "baz" }

class User
  scope :active, :status => 'active'
  scope :over, :lambda { |age| where(:age.gt => age) }
end

User.where(:name => /^J/).active.over(40)

 class Article
  include Mongoid::Document
  field :name, type: String
  field :body, type: String
  field :slug, type: String

  before_create :send_message

  after_save do |document|
    # Handle callback here.
  end

  protected
  def send_message
    # Message sending code here.
  end
end

 class Person
  include Mongoid::Document
  include Mongoid::Timestamps
end
//This adds basic behavior for created_at and updated_at fields.

User.where(:name => "John")
User.all(:age.lt => 24, :age.gt => 18)
User.where(:title.in => %w(Ms Mrs))

class User
  scope :active, :status => 'active'
  scope :over, :lambda { |age| where(:age.gt => age) }
end
User.where(:name => /^J/).active.over(40)

 class Spot
  include Mongoid::Document

  field :name, :type => String
  field :latlng, :type => Array

  index [[:latlng, Mongo::GEO2D]]
end
Ruby Spot.create( :name => "Majoran Distillery", :latlng => [41.910973,-87.635544] )

Spot.where(:latlng.near => majoran.latlng)
#=> [“Majoran Distillery”, ”Cibo”, “Westpac” ]
Bar.where(:likes.gt => 100).geo_near([ 50, 12 ]).spherical