indexed_models.rb

class Event < ActiveRecord::Base
  belongs_to :group
  belongs_to :location
  
  validates_presence_of :group_id, :location_id, :start_time, :end_time
  
  define_index do
    indexes name
  end
end

class Group < ActiveRecord::Base
  has_many :events
  has_many :locations, :through => :events
  
  validates_presence_of :name
  
  define_index do
    indexes name
    indexes events.description, :as => :event_descriptions
    indexes [locations.name, locations.address], :as => :location_addresses
  end
end

class Location < ActiveRecord::Base
  acts_as_mappable :auto_geocode => true, :lat_column_name => 'latitude', :lng_column_name => 'longitude'

  has_many :events
  has_many :groups, :through => :events
  
  validates_presence_of :name, :address
  
  define_index do
    indexes name, :sortable => true
    indexes address, :sortable => true
  end
end