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# frozen_string_literal: true
module Gitlab
module Database
# This abstract class is used for models which need to exist in multiple de-composed databases.
class SharedModel < ActiveRecord::Base
self.abstract_class = true
# if shared model is used, this allows to limit connections
# on which this model is being shared
class_attribute :limit_connection_names, default: nil
class << self
def using_connection(connection)
previous_connection = self.overriding_connection
unless previous_connection.nil? || previous_connection.equal?(connection)
raise 'cannot nest connection overrides for shared models with different connections'
end
self.overriding_connection = connection
yield
ensure
self.overriding_connection = nil unless previous_connection.equal?(self.overriding_connection)
end
def connection
if connection = self.overriding_connection
connection
else
super
end
end
private
def overriding_connection
Thread.current[:overriding_connection]
end
def overriding_connection=(connection)
Thread.current[:overriding_connection] = connection
end
end
def connection_db_config
self.class.connection_db_config
end
end
end
end
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