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# Licensed to Elasticsearch B.V. under one or more contributor
# license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright
# ownership. Elasticsearch B.V. licenses this file to you under
# the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
module Elasticsearch
module Model
module Adapter
# An adapter to be used for deserializing results from multiple models,
# retrieved through `Elasticsearch::Model.search`
#
# @see Elasticsearch::Model.search
#
module Multiple
Adapter.register self, lambda { |klass| klass.is_a? Multimodel }
module Records
# Returns a collection of model instances, possibly of different classes (ActiveRecord, Mongoid, ...)
#
# @note The order of results in the Elasticsearch response is preserved
#
def records
records_by_type = __records_by_type
records = response.response["hits"]["hits"].map do |hit|
records_by_type[ __type_for_hit(hit) ][ hit[:_id] ]
end
records.compact
end
# Returns the collection of records grouped by class based on `_type`
#
# Example:
#
# {
# Foo => {"1"=> #<Foo id: 1, title: "ABC"}, ...},
# Bar => {"1"=> #<Bar id: 1, name: "XYZ"}, ...}
# }
#
# @api private
#
def __records_by_type
result = __ids_by_type.map do |klass, ids|
records = __records_for_klass(klass, ids)
ids = records.map(&:id).map(&:to_s)
[ klass, Hash[ids.zip(records)] ]
end
Hash[result]
end
# Returns the collection of records for a specific type based on passed `klass`
#
# @api private
#
def __records_for_klass(klass, ids)
adapter = __adapter_for_klass(klass)
case
when Elasticsearch::Model::Adapter::ActiveRecord.equal?(adapter)
klass.where(klass.primary_key => ids)
when Elasticsearch::Model::Adapter::Mongoid.equal?(adapter)
klass.where(:id.in => ids)
else
klass.find(ids)
end
end
# Returns the record IDs grouped by class based on type `_type`
#
# Example:
#
# { Foo => ["1"], Bar => ["1", "5"] }
#
# @api private
#
def __ids_by_type
ids_by_type = {}
response.response["hits"]["hits"].each do |hit|
type = __type_for_hit(hit)
ids_by_type[type] ||= []
ids_by_type[type] << hit[:_id]
end
ids_by_type
end
# Returns the class of the model corresponding to a specific `hit` in Elasticsearch results
#
# @see Elasticsearch::Model::Registry
#
# @api private
#
def __type_for_hit(hit)
@@__types ||= {}
key = "#{hit[:_index]}::#{hit[:_type]}" if hit[:_type] && hit[:_type] != '_doc'
key = hit[:_index] unless key
@@__types[key] ||= begin
Registry.all.detect do |model|
(model.index_name == hit[:_index] && __no_type?(hit)) ||
(model.index_name == hit[:_index] && model.document_type == hit[:_type])
end
end
end
def __no_type?(hit)
hit[:_type].nil? || hit[:_type] == '_doc'
end
# Returns the adapter registered for a particular `klass` or `nil` if not available
#
# @api private
#
def __adapter_for_klass(klass)
Adapter.adapters.select { |name, checker| checker.call(klass) }.keys.first
end
end
end
end
end
end
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