rails, activerecord, get current connection specification

Question

I am writing code that will migrate some data from one database to another, over-writing some data in the destination. It uses ActiveRecord, since it\'s associated with a Ra

Answer 1

Similar to the way that you can call connection on a model, you can make a call to connection on ActiveRecord::Base.

ActiveRecord::Base.connection_config

Look at the docs for ActiveRecord::Base, as there are other methods that allow you to get/set attributes about the connection.

Answer 2

Rails internally instantiate a new connection depending on the DBMS being used by delegating the logic to the different supported adapters. That information is in the @connection_adapters instance variable set in the constructor:

ActiveRecord::Base.connection.instance_variable_get(:@connection_parameters)

The difference is ActiveRecord::Base.connection_config returns a hash containing the data already "mapped" for Rails purposes, you could easily instantiate a new connection by doing

PG.connect(ActiveRecord::Base.connection.instance_variable_get(:@connection_parameters))

Answer 3

The answer is SomeModel.connection_config