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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
class Collection
class View
# Defines explain related behaviour for collection view.
#
# @since 2.0.0
module Explainable
# The query planner verbosity constant.
#
# @since 2.2.0
QUERY_PLANNER = 'queryPlanner'.freeze
# The execution stats verbosity constant.
#
# @since 2.2.0
EXECUTION_STATS = 'executionStats'.freeze
# The all plans execution verbosity constant.
#
# @since 2.2.0
ALL_PLANS_EXECUTION = 'allPlansExecution'.freeze
# Get the explain plan for the query.
#
# @example Get the explain plan for the query.
# view.explain
#
# @return [ Hash ] A single document with the explain plan.
#
# @since 2.0.0
def explain
self.class.new(collection, selector, options.merge(explain_options)).first
end
private
def explained?
!!options[:explain]
end
def explain_options
explain_limit = limit || 0
{ :limit => -explain_limit.abs, :explain => true }
end
end
end
end
end
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