Rails engine with own DB

[Tomas Valent]

I was wondering if there is a way how to do Rails Engines (as bound contexts) where each engine would have it's own (ActiveRecord) database. 

Referring to article https://medium.com/@dan_manges/the-modular-monolith-rails-architecture-fb1023826fc4

Imagine every bound context (Rails engine) would have own DB (like microservices has) 

Online store app

  * product listing - own postgres DB

  * orders  - own postgres DB

  * basket - own postgres DB

I know that this could teoretically be done on model level:

module YourEngine
  class Post < ActiveRecord::Base
    establish_connection :adapter => 'sqlite3', :database => 'db/your_engine.sqlite3'
  end
end

But is there anything like `my_engine/config/database.yml`  ==> own ActiveRecord database setup for every engine ? 

I'm purely just investigating the possibilities for a talk don't really want to implement something like that

Thank you