[[activemodel_activerecord]]
=== ActiveModel / ActiveRecord

The `elasticsearch-model` http://rubygems.org/gems/elasticsearch-model[Rubygem]
provides integration with Ruby domain objects ("models"), commonly found for 
example, in Ruby on Rails applications.

It uses the `elasticsearch` Rubygem as the client communicating with the {es} 
cluster.


[discrete]
==== Features

* ActiveModel integration with adapters for ActiveRecord and Mongoid
* Enumerable-based wrapper for search results
* ActiveRecord::Relation-based wrapper for returning search results as records
* Convenience model methods such as `search`, `mapping`, `import`, etc
* Support for Kaminari and WillPaginate pagination
* Extension implemented via proxy object to shield model namespace from collisions
* Convenience methods for (re)creating the index, setting up mappings, indexing documents, ...


[discrete]
==== Usage

Add the library to your Gemfile:

[source,ruby]
------------------------------------
gem 'elasticsearch-rails'
------------------------------------

Include the extension module in your model class:

[source,ruby]
------------------------------------
class Article < ActiveRecord::Base
  include Elasticsearch::Model
end
------------------------------------

Import some data and perform a search:

[source,ruby]
------------------------------------
Article.import

response = Article.search 'fox dog'
response.took
# => 3
------------------------------------

It is possible to either return results as model instances, or decorated 
documents from {es}, with the `records` and `results` methods, respectively:

[source,ruby]
------------------------------------
response.records.first
# Article Load (0.4ms)  SELECT "articles".* FROM "articles"  WHERE ...
=> #<Article id: 3, title: "Foo " ...>

response.results.first._score
# => 0.02250402

response.results.first._source.title
# => "Quick brown fox"
------------------------------------

Consult the 
https://github.com/elastic/elasticsearch-rails/tree/master/elasticsearch-model[documentation]
for more information.
