gistfile1.rb

# Example #1: Person
person = Node.create({
  type: 'person',
  uri: 'http://people.com/people/23',
  attrs: { birth_date: Time.parse('June 23, 1982').to_date }
})

Node.tire.search(load: true) { filter :range, 'attrs.birth_date' => { lte: Time.zone.now } }.size # => 0

# Example #2: Country
country = Node.create({
  type: 'country',
  key: 'IT',
  attrs: { name: 'Italy' }
})

Node.tire.search(load: true) { filter :term, 'attrs.title' => 'Italy' }.size # => 0

node.rb

class Node
  include Mongoid::Document
  include Tire::Model::Search
  include Tire::Model::Callbacks

  field :type
  field :key
  field :uri
  field :attrs, type: Hash, default: {}

  mapping do
    indexes :id, index: :not_analized
    indexes :type, analyzer: 'keyword'
    indexes :key,  analyzer: 'keyword'
    indexes :uri,  analyzer: 'keyword'
    indexes :attrs, type: 'object'
  end
end