Multiple adapters per mapper


I have a need for multiple adapters per mapper for my project and wanted to chat about it a bit here. I see it was already mentioned here but apparently there are a few issues before work on that can continue.

I have written an adapter which I use for a few collections, mainly the user collection. However, I still have collections that I would like to use in pg or mysql. I think the proposed Example 2 in issue #33 would be a nice DSL for this feature.

Any thoughts on revisiting this\what the issues were preventing the implementation?



@taylorfinnell Hello. This was an initial idea that we discarded because it increases a lot the internals of Lotus::Model.

Do you know that you can have multiple instances of Lotus::Model in the same Ruby process? That means your main database connection can be against PG, then the secondary one for auth0. The first should stay under lib/, while the secondary can be used inside the applications eg:

# apps/web/application.rb
module Web
  class Application < Lotus::Application
    configure do
      # ...
      adapter :auth0 # ...

      mapping do
         # ....

These two settings aren’t automatically generated in application configuration as of v0.4.0, because they were source of confusion for devs.

If you enable them, you can have a separated, standalone configuration for Lotus::Model.

Please let us to know if this can get your job done. Thank you! :smiley:


@jodosha Seems to me (as a complete lotus noob) that a more reasonable place to define a second data source (e.g. one to postgres, one to for instance) would be to have a second subdirectory under lib. so in addition to lib/<the_app_name> you would also have, in the above case, lib/auth0_dot_com (perhaps).

Seems to be the most natural place for that code to live but the caveats are (1) I could have misunderstood the architecture (2) at this moment in time I have no idea how to connect the dots and make it work.

Thoughts ?


@jodosha I have a doubt similar as @baob, but in my case I have two databases (mysql and postgres) with entities/repositories who need to be shared across multiples apps, what is the best place to go?

update: Reading the lotus/model.rb and lotus/repository.rb I found how to setup each repository with different adapter.

If can be helpful to someone else, I made a demo here.