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[DOC] Added comprehensive documentation for the Ruby and Rails integrations

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== The Ruby Client
The `elasticsearch` http://rubygems.org/gems/elasticsearch[Rubygem] provides a low-level client
for communicating with an Elasticsearch cluster, fully compatible with other official clients.
Full documentation is hosted at http://github.com/elasticsearch/elasticsearch-ruby[Github]
and http://rubydoc.info/gems/elasticsearch[RubyDoc]
-- this documentation provides only an overview of features.
=== Elasticsearch Version Compatibility
The Ruby API is compatible with both Elasticsearch 0.90.x and 1.0.x versions, you have to install
a matching http://rubygems.org/gems/elasticsearch/versions[gem version], though:
[cols="<,<",options="header",]
|=========================================
| Elasticsearch version | Ruby gem version
| 0.90.x | 0.4.x
| 1.x | 1.x
|=========================================
=== Installation
Install the Ruby gem for Elasticsearch *1.x*:
[source,sh]
------------------------------------
gem install elasticsearch
------------------------------------
...or add it do your Gemfile:
[source,ruby]
------------------------------------
gem 'elasticsearch'
------------------------------------
Install the Ruby gem for Elasticsearch *0.90.x*:
[source,sh]
------------------------------------
gem install elasticsearch -v 0.4.10
------------------------------------
...or add it do your Gemfile:
[source,ruby]
------------------------------------
gem 'elasticsearch', '~> 0.4'
------------------------------------
=== Example Usage
[source,ruby]
------------------------------------
require 'elasticsearch'
client = Elasticsearch::Client.new log: true
client.cluster.health
client.index index: 'my-index', type: 'my-document', id: 1, body: { title: 'Test' }
client.indices.refresh index: 'my-index'
client.search index: 'my-index', body: { query: { match: { title: 'test' } } }
------------------------------------
=== Features at a Glance
* Pluggable logging and tracing
* Plugabble connection selection strategies (round-robin, random, custom)
* Pluggable transport implementation, customizable and extendable
* Pluggable serializer implementation
* Request retries and dead connections handling
* Node reloading (based on cluster state) on errors or on demand
* Modular API implementation
* 100% REST API coverage
=== Transport and API
The `elasticsearch` gem combines two separate Ruybygems:
* https://github.com/elasticsearch/elasticsearch-ruby/tree/master/elasticsearch-transport[`elasticsearch-transport`]
provides a HTTP Ruby client for connecting to the Elasticsearch cluster,
* https://github.com/elasticsearch/elasticsearch-ruby/tree/master/elasticsearch-api[`elasticsearch-api`]
provides a Ruby API for the Elasticsearch RESTful API.
Please see their respective documentation for configuration options and technical details.
Notably, the documentation and comprehensive examples for all the API methods is contained in the source,
and available online at http://rubydoc.info/gems/elasticsearch-api/Elasticsearch/API/Actions[Rubydoc].
Keep in mind, that for optimal performance, you should use a HTTP library which supports
persistent ("keep-alive") HTTP connections.
=== Extensions
The https://github.com/elasticsearch/elasticsearch-ruby/tree/master/elasticsearch-extensions[`elasticsearch-extensions`]
Rubygem provides a number of extensions to the core client, such as an API to programatically launch
Elasticsearch clusters (eg. for testing purposes), and more.
Please see its
https://github.com/elasticsearch/elasticsearch-ruby/tree/master/elasticsearch-extensions[documentation]
for more information.

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== Copyright and License
This software is Copyright (c) 2013 by Elasticsearch BV.
This is free software, licensed under The Apache License Version 2.0.

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= elasticsearch-ruby = Ruby And Rails Integrations
== Overview include::client.asciidoc[]
There's a suite of official Ruby libraries for Elasticsearch, which provide a client for connecting include::model.asciidoc[]
to Elasticsearch clusters, Ruby interface to the REST API, and more.
See the full documentation at http://github.com/elasticsearch/elasticsearch-ruby. include::rails.asciidoc[]
=== Elasticsearch Version Compatibility include::persistence.asciidoc[]
The Ruby libraries are compatible with both Elasticsearch 0.90.x and 1.0.x versions, include::copyright.asciidoc[]
but you have to install a matching http://rubygems.org/gems/elasticsearch/versions[gem version]:
[cols="<,<",options="header",]
|=========================================
| Elasticsearch version | Ruby gem version
| 0.90.x | 0.4.x
| 1.0.x | 1.x
|=========================================
=== Installation
Install the Ruby gem for Elasticsearch *1.x*:
[source,sh]
------------------------------------
gem install elasticsearch
------------------------------------
...or add it do your Gemfile:
[source,ruby]
------------------------------------
gem 'elasticsearch'
------------------------------------
Install the Ruby gem for Elasticsearch *0.90.x*:
[source,sh]
------------------------------------
gem install elasticsearch -v 0.4.10
------------------------------------
...or add it do your Gemfile:
[source,ruby]
------------------------------------
gem 'elasticsearch', '~> 0.4'
------------------------------------
=== Example Usage
[source,ruby]
------------------------------------
require 'elasticsearch'
client = Elasticsearch::Client.new log: true
client.cluster.health
client.index index: 'my-index', type: 'my-document', id: 1, body: { title: 'Test' }
client.indices.refresh index: 'my-index'
client.search index: 'my-index', body: { query: { match: { title: 'test' } } }
------------------------------------
=== Features at a Glance
* Pluggable logging and tracing
* Plugabble connection selection strategies (round-robin, random, custom)
* Pluggable transport implementation, customizable and extendable
* Pluggable serializer implementation
* Request retries and dead connections handling
* Node reloading (based on cluster state) on errors or on demand
* Modular API implementation
* 100% REST API coverage
== Copyright and License
This software is Copyright (c) 2013 by Elasticsearch BV.
This is free software, licensed under The Apache License Version 2.0.

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== ActiveModel / ActiveRecord
The `elasticsearch-model` http://rubygems.org/gems/elasticsearch-model[Rubygem]
provides integration with Ruby domain objects ("models"), commonly found e.g. in Ruby on Rails applications.
It uses the `elasticsearch` Rubygem as the client communicating with the Elasticsearch cluster.
=== Features at a Glance
* 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, ...
=== 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 Elasticsearch,
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"
------------------------------------
Please see the full https://github.com/elasticsearch/elasticsearch-rails/tree/master/elasticsearch-model[documentation]
for more information.

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== Persistence
The `elasticsearch-persistence` http://rubygems.org/gems/elasticsearch-persistence[Rubygem]
provides persistence layer for Ruby domain objects.
It supports two design patterns for integrating with your objects: _repository_ and _active record_.
=== Repository
The `Elasticsearch::Persistence::Repository` module provides an implementation of the repository pattern and allows to save, delete, find and search objects stored in Elasticsearch, as well as configure mappings and settings for the index.
==== Features At a Glance
* Access to the Elasticsearch client
* Setting the index name, document type, and object class for deserialization
* Composing mappings and settings for the index
* Creating, deleting or refreshing the index
* Finding or searching for documents
* Providing access both to domain objects and hits for search results
* Providing access to the Elasticsearch response for search results (aggregations, total, ...)
* Defining the methods for serialization and deserialization
==== Usage
Let's have a simple plain old Ruby object (PORO):
[source,ruby]
------------------------------------
class Note
attr_reader :attributes
def initialize(attributes={})
@attributes = attributes
end
def to_hash
@attributes
end
end
------------------------------------
Let's create a default, "dumb" repository, as a first step:
[source,ruby]
------------------------------------
require 'elasticsearch/persistence'
repository = Elasticsearch::Persistence::Repository.new
------------------------------------
We can save a `Note` instance into the repository, find it, search it, delete it:
[source,ruby]
------------------------------------
note = Note.new id: 1, text: 'Test'
repository.save(note)
# PUT http://localhost:9200/repository/note/1
# > {"id":1,"text":"Test"}
# < {"_index":"repository","_type":"note","_id":"1","_version":1,"created":true}
n = repository.find(1)
# GET http://localhost:9200/repository/_all/1
# < {"_index":"repository","_type":"note","_id":"1","_version":2,"found":true, "_source" : {"id":1,"text":"Test"}}
=> <Note:0x007fcbfc0c4980 @attributes={"id"=>1, "text"=>"Test"}>
repository.search(query: { match: { text: 'test' } }).first
# GET http://localhost:9200/repository/_search
# > {"query":{"match":{"text":"test"}}}
# < {"took":2, ... "hits":{"total":1, ... "hits":[{ ... "_source" : {"id":1,"text":"Test"}}]}}
=> <Note:0x007fcbfc1c7b70 @attributes={"id"=>1, "text"=>"Test"}>
repository.delete(note)
# DELETE http://localhost:9200/repository/note/1
# < {"found":true,"_index":"repository","_type":"note","_id":"1","_version":3}
=> {"found"=>true, "_index"=>"repository", "_type"=>"note", "_id"=>"1", "_version"=>2}
------------------------------------
The repository module provides a number of features and facilities to configure and customize the behaviour,
as well as support for extending your own, custom repository class.
Please refer to the
https://github.com/elasticsearch/elasticsearch-rails/tree/master/elasticsearch-persistence#the-repository-pattern[documentation]
for more information.
Also, check out the
https://github.com/elasticsearch/elasticsearch-rails/tree/master/elasticsearch-persistence#example-application[example application] which demonstrates the usage patterns of the _repository_ approach to persistence.
=== Active Record
The `Elasticsearch::Persistence::Model` module provides an implementation of the active record pattern, with
a familiar interface for using Elasticsearch as a persistence layer in Ruby on Rails applications. The model
is fully compatible with Rails' conventions and helpers, such as `url_for`.
All the methods are documented with comprehensive examples in the source code, available also
http://rubydoc.info/gems/elasticsearch-persistence/Elasticsearch/Persistence/Model[online].
==== Features At a Glance
* Familiar interface for persistence methods from ActiveRecord
* Common model features such as validations and callbacks
* Methods for defining model attributes, including Elasticsearch mappings
* Support for fetching data in bulk (`find_in_batches`, `find_each`)
* Decorated search results for easy access to model instances and meta data (such as highlights or aggregations)
* Easy access to the underlying gateway and client
==== Usage
To use the library in a Rails application, add it to your Gemfile with a require statement:
[source,ruby]
------------------------------------
gem "elasticsearch-persistence", require: 'elasticsearch/persistence/model'
------------------------------------
Include the module in a plain Ruby class, and set up the properties, mappings, etc:
[source,ruby]
------------------------------------
class Article
include Elasticsearch::Persistence::Model
# Define a plain `title` attribute
#
attribute :title, String
# Define an `author` attribute, with multiple analyzers for this field
#
attribute :author, String, mapping: { fields: {
author: { type: 'string'},
raw: { type: 'string', analyzer: 'keyword' }
} }
# Define a `views` attribute, with default value
#
attribute :views, Integer, default: 0, mapping: { type: 'integer' }
# Validate the presence of the `title` attribute
#
validates :title, presence: true
# Execute code after saving the model.
#
after_save { puts "Successfuly saved: #{self}" }
end
------------------------------------
The model attribute definition support is implemented with the https://github.com/solnic/virtus[_Virtus_] Rubygem,
and the naming, validation, etc. features with the https://github.com/rails/rails/tree/master/activemodel[_ActiveModel_] Rubygem.
Attribute validations work like for any other ActiveModel-compatible implementation:
[source,ruby]
------------------------------------
article = Article.new # => #<Article { ... }>
article.valid?
# => false
article.errors.to_a
# => ["Title can't be blank"]
------------------------------------
We can create a new article in the database and find it:
[source,ruby]
------------------------------------
Article.create id: 1, title: 'Test', author: 'John'
# PUT http://localhost:9200/articles/article/1 [status:201, request:0.015s, query:n/a]
article = Article.find(1)
# => #<Article { ... }>
article._index
# => "articles"
article.id
# => "1"
article.title
# => "Test"
------------------------------------
To update the model, either update the attribute and save the model or use the `update_attributes` method:
[source,ruby]
------------------------------------
article.title = 'Updated'
article.save
# => {"_index"=>"articles", "_type"=>"article", "_id"=>"1", "_version"=>2, "created"=>false}
article.update_attributes title: 'Test', author: 'Mary'
# => {"_index"=>"articles", "_type"=>"article", "_id"=>"1", "_version"=>3}
------------------------------------
The implementation supports the familiar interface for updating model timestamps and numeric attributes:
[source,ruby]
------------------------------------
article.touch
# => => { ... "_version"=>4}
article.views
# => 0
article.increment :views
article.views
# => 1
------------------------------------
Any callbacks defined in the model will be triggered during the persistence operations:
[source,ruby]
------------------------------------
article.save
# Successfuly saved: #<Article {...}>
------------------------------------
Please see the extensive documentation in the library
https://github.com/elasticsearch/elasticsearch-rails/tree/master/elasticsearch-persistence#the-activerecord-pattern[README]
for detailed information.
Also, check out the
https://github.com/elasticsearch/elasticsearch-rails/tree/master/elasticsearch-persistence#example-application-1[example application] which demonstrates the usage patterns of the _active record_ approach to persistence.

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== Ruby On Rails
The `elasticsearch-rails` http://rubygems.org/gems/elasticsearch-rails[Rubygem]
provides features suitable for Ruby on Rails applications.
=== Features at a Glance
* Rake tasks for importing data from application models
* Integration with Rails' instrumentation framework
* Templates for generating example Rails application
=== Example applications
You can generate a fully working example Ruby on Rails application with templates provides.
Please refer to the https://github.com/elasticsearch/elasticsearch-rails/tree/master/elasticsearch-rails[documentation] for more information.