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module Elasticsearch
module Model
module Adapter
# An adapter for ActiveRecord-based models
#
module ActiveRecord
Adapter.register self,
lambda { |klass| !!defined?(::ActiveRecord::Base) && klass.respond_to?(:ancestors) && klass.ancestors.include?(::ActiveRecord::Base) }
module Records
attr_writer :options
def options
@options ||= {}
end
# Returns an `ActiveRecord::Relation` instance
#
def records
sql_records = klass.where(klass.primary_key => ids)
sql_records = sql_records.includes(self.options[:includes]) if self.options[:includes]
# Re-order records based on the order from Elasticsearch hits
# by redefining `to_a`, unless the user has called `order()`
#
sql_records.instance_exec(response.response['hits']['hits']) do |hits|
ar_records_method_name = :to_a
ar_records_method_name = :records if defined?(::ActiveRecord) && ::ActiveRecord::VERSION::MAJOR >= 5
define_singleton_method(ar_records_method_name) do
if defined?(::ActiveRecord) && ::ActiveRecord::VERSION::MAJOR >= 4
self.load
else
self.__send__(:exec_queries)
end
@records.sort_by { |record| hits.index { |hit| hit['_id'].to_s == record.id.to_s } }
end if self
end
sql_records
end
# Prevent clash with `ActiveSupport::Dependencies::Loadable`
#
def load
records.__send__(:load)
end
# Intercept call to the `order` method, so we can ignore the order from Elasticsearch
#
def order(*args)
sql_records = records.__send__ :order, *args
# Redefine the `to_a` method to the original one
#
sql_records.instance_exec do
define_singleton_method(:to_a) do
if defined?(::ActiveRecord) && ::ActiveRecord::VERSION::MAJOR >= 4
self.load
else
self.__send__(:exec_queries)
end
@records
end
end
sql_records
end
end
module Callbacks
# Handle index updates (creating, updating or deleting documents)
# when the model changes, by hooking into the lifecycle
#
# @see http://guides.rubyonrails.org/active_record_callbacks.html
#
def self.included(base)
base.class_eval do
after_commit lambda { __elasticsearch__.index_document }, on: :create
after_commit lambda { __elasticsearch__.update_document }, on: :update
after_commit lambda { __elasticsearch__.delete_document }, on: :destroy
end
end
end
module Importing
# Fetch batches of records from the database (used by the import method)
#
#
# @see http://api.rubyonrails.org/classes/ActiveRecord/Batches.html ActiveRecord::Batches.find_in_batches
#
def __find_in_batches(options={}, &block)
query = options.delete(:query)
named_scope = options.delete(:scope)
preprocess = options.delete(:preprocess)
scope = self
scope = scope.__send__(named_scope) if named_scope
scope = scope.instance_exec(&query) if query
scope.find_in_batches(options) do |batch|
yield (preprocess ? self.__send__(preprocess, batch) : batch)
end
end
def __transform
lambda { |model| { index: { _id: model.id, data: model.__elasticsearch__.as_indexed_json } } }
end
end
end
end
end
end