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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 Database
# A class representing a view of a database.
#
# @since 2.0.0
class View
extend Forwardable
include Enumerable
def_delegators :@database, :cluster, :read_preference, :client
def_delegators :cluster, :next_primary
# @return [ Integer ] batch_size The size of the batch of results
# when sending the listCollections command.
attr_reader :batch_size
# @return [ Integer ] limit The limit when sending a command.
attr_reader :limit
# @return [ Collection ] collection The command collection.
attr_reader :collection
# Get all the names of the non system collections in the database.
#
# @example Get the collection names.
# database.collection_names
#
# @param [ Hash ] options Options for the listCollections command.
#
# @option options [ Integer ] :batch_size The batch size for results
# returned from the listCollections command.
#
# @return [ Array<String> ] The names of all non-system collections.
#
# @since 2.0.0
def collection_names(options = {})
@batch_size = options[:batch_size]
server = next_primary(false)
@limit = -1 if server.features.list_collections_enabled?
session = client.send(:get_session, options)
collections_info(server, session).collect do |info|
if server.features.list_collections_enabled?
info[Database::NAME]
else
(info[Database::NAME] &&
info[Database::NAME].sub("#{@database.name}.", ''))
end
end
end
# Get info on all the collections in the database.
#
# @example Get info on each collection.
# database.list_collections
#
# @return [ Array<Hash> ] Info for each collection in the database.
#
# @since 2.0.5
def list_collections
session = client.send(:get_session)
collections_info(next_primary(false), session)
end
# Create the new database view.
#
# @example Create the new database view.
# View::Index.new(database)
#
# @param [ Database ] database The database.
#
# @since 2.0.0
def initialize(database)
@database = database
@batch_size = nil
@limit = nil
@collection = @database[Database::COMMAND]
end
private
def collections_info(server, session, &block)
cursor = Cursor.new(self, send_initial_query(server, session), server, session: session)
cursor.each do |doc|
yield doc
end if block_given?
cursor.to_enum
end
def collections_info_spec(session)
{ selector: {
listCollections: 1,
cursor: batch_size ? { batchSize: batch_size } : {} },
db_name: @database.name,
session: session
}
end
def initial_query_op(session)
Operation::Commands::CollectionsInfo.new(collections_info_spec(session))
end
def send_initial_query(server, session)
initial_query_op(session).execute(server)
end
end
end
end
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