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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 change connection for Gitlab::Database::SharedModel "\
"from '#{Gitlab::Database.db_config_name(previous_connection)}' "\
"to '#{Gitlab::Database.db_config_name(connection)}'"
end
# connection might not be yet adopted (returning nil, and no gitlab_schemas)
# in such cases it is fine to ignore such connections
gitlab_schemas = Gitlab::Database.gitlab_schemas_for_connection(connection)
unless gitlab_schemas.nil? || gitlab_schemas.include?(:gitlab_shared)
raise "Cannot set `SharedModel` to connection from `#{Gitlab::Database.db_config_name(connection)}` " \
"since this connection does not include `:gitlab_shared` schema."
end
self.overriding_connection = connection
yield
ensure
self.overriding_connection = previous_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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