Establish_connection only on need

Rails
1

I have one abstract ActiveRecord::Base class that establishes connection
to other db, and it does every time it is included, on every environment
load. It starts to establish it at script/console for example.

I need to move that establishing only when there is actual request per
that model is made.

2

Are you doing something like this ?:
class YourModel < ActiveRecord::Base
establish_connection :db_config
end

3

Yes