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# Copyright (C) 2014-2017 MongoDB, Inc.
#
# Licensed 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 Mongo
module Operation
module Commands
# A MongoDB map reduce operation.
#
# @note A map/reduce operation can behave like a read and
# return a result set, or can behave like a write operation and
# output results to a user-specified collection.
#
# @example Create the map/reduce operation.
# MapReduce.new({
# :selector => {
# :mapreduce => 'test_coll',
# :map => '',
# :reduce => ''
# },
# :db_name => 'test_db'
# })
#
# Initialization:
# param [ Hash ] spec The specifications for the operation.
#
# option spec :selector [ Hash ] The map reduce selector.
# option spec :db_name [ String ] The name of the database on which
# the operation should be executed.
# option spec :options [ Hash ] Options for the map reduce command.
#
# @since 2.0.0
class MapReduce < Command
include TakesWriteConcern
include CausallyConsistent
private
def message(server)
sel = update_selector_for_write_concern(selector, server)
if server.features.op_msg_enabled?
command_op_msg(server, sel, options)
else
sel = update_selector_for_read_pref(sel, server)
opts = update_options_for_slave_ok(options, server)
Protocol::Query.new(db_name, query_coll, sel, opts)
end
end
end
end
end
end
require 'mongo/operation/commands/map_reduce/result'
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