Module: Elasticsearch::Persistence::Model

Defined in:
lib/elasticsearch/persistence/model.rb,
lib/elasticsearch/persistence/model/base.rb,
lib/elasticsearch/persistence/model/find.rb,
lib/elasticsearch/persistence/model/rails.rb,
lib/elasticsearch/persistence/model/store.rb,
lib/elasticsearch/persistence/model/errors.rb

Overview

When included, extends a plain Ruby class with persistence-related features via the ActiveRecord pattern

Examples:

Include the repository in a custom class


require 'elasticsearch/persistence/model'

class MyObject
  include Elasticsearch::Persistence::Repository
end

Defined Under Namespace

Modules: Base, Find, Rails, Store, Utils Classes: DocumentNotPersisted, DocumentNotSaved

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/elasticsearch/persistence/model.rb', line 26

def self.included(base)
  base.class_eval do
    include ActiveModel::Naming
    include ActiveModel::Conversion
    include ActiveModel::Serialization
    include ActiveModel::Serializers::JSON
    include ActiveModel::Validations

    include Virtus.model

    extend  ActiveModel::Callbacks
    define_model_callbacks :create, :save, :update, :destroy
    define_model_callbacks :find, :touch, only: :after

    include Elasticsearch::Persistence::Model::Base::InstanceMethods

    extend  Elasticsearch::Persistence::Model::Store::ClassMethods
    include Elasticsearch::Persistence::Model::Store::InstanceMethods

    extend  Elasticsearch::Persistence::Model::Find::ClassMethods

    class << self
      # Re-define the Virtus' `attribute` method, to configure Elasticsearch mapping as well
      #
      def attribute(name, type=nil, options={}, &block)
        mapping = options.delete(:mapping) || {}
        super

        gateway.mapping do
          indexes name, {type: Utils::lookup_type(type)}.merge(mapping)
        end

        gateway.mapping(&block) if block_given?
      end

      # Return the {Repository::Class} instance
      #
      def gateway(&block)
        @gateway ||= Elasticsearch::Persistence::Repository::Class.new host: self
        block.arity < 1 ? @gateway.instance_eval(&block) : block.call(@gateway) if block_given?
        @gateway
      end

      # Delegate methods to repository
      #
      delegate :settings,
               :mappings,
               :mapping,
               :document_type,
               :document_type=,
               :index_name,
               :index_name=,
               :find,
               :exists?,
               :create_index!,
               :refresh_index!,
        to: :gateway
    end

    # Configure the repository based on the model (set up index_name, etc)
    #
    gateway do
      klass         base
      index_name    base.model_name.collection.gsub(/\//, '-')
      document_type base.model_name.element

      def serialize(document)
        document.to_hash.except(:id, 'id')
      end

      def deserialize(document)
        object = klass.new document['_source']

        # Set the meta attributes when fetching the document from Elasticsearch
        #
        object.instance_variable_set :@_id,      document['_id']
        object.instance_variable_set :@_index,   document['_index']
        object.instance_variable_set :@_type,    document['_type']
        object.instance_variable_set :@_version, document['_version']

        # Store the "hit" information (highlighting, score, ...)
        #
        object.instance_variable_set :@hit,
           Hashie::Mash.new(document.except('_index', '_type', '_id', '_version', '_source'))

        object.instance_variable_set(:@persisted, true)
        object
      end
    end

    # Set up common attributes
    #
    attribute :created_at, DateTime, default: lambda { |o,a| Time.now.utc }
    attribute :updated_at, DateTime, default: lambda { |o,a| Time.now.utc }

    attr_reader :hit
  end

end