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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 iteration related behaviour for collection views, including
# cursor instantiation.
#
# @since 2.0.0
module Iterable
# Iterate through documents returned by a query with this +View+.
#
# @example Iterate through the result of the view.
# view.each do |document|
# p document
# end
#
# @return [ Enumerator ] The enumerator.
#
# @since 2.0.0
#
# @yieldparam [ Hash ] Each matching document.
def each
@cursor = nil
session = client.send(:get_session, @options)
read_with_retry do
server = server_selector.select_server(cluster, false)
result = send_initial_query(server, session)
@cursor = Cursor.new(view, result, server, session: session)
end
@cursor.each do |doc|
yield doc
end if block_given?
@cursor.to_enum
end
# Stop the iteration by sending a KillCursors command to the server.
#
# @example Stop the iteration.
# view.close_query
#
# @since 2.1.0
def close_query
@cursor.send(:kill_cursors) if @cursor && !@cursor.closed?
end
alias :kill_cursors :close_query
private
def initial_query_op(server, session)
if server.features.find_command_enabled?
initial_command_op(session)
else
Operation::Read::Query.new(Builder::OpQuery.new(self).specification)
end
end
def initial_command_op(session)
if explained?
Operation::Commands::Explain.new(Builder::FindCommand.new(self, session).explain_specification)
else
Operation::Commands::Find.new(Builder::FindCommand.new(self, session).specification)
end
end
def send_initial_query(server, session = nil)
validate_collation!(server, collation)
initial_query_op(server, session).execute(server)
end
end
end
end
end
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