Use schema.rb in gem

rake, ruby, ruby-on-rails

Solution

According to the Rails 3.2 source code https://github.com/rails/rails/blob/3-2-stable/activerecord/lib/active_record/railties/databases.rake#L400 , setting SCHEMA env variable should help:

ENV['SCHEMA'] = Core::Engine.paths['db'].existent

As I remember, the database tasks has been changed significantly in Rails 4, so this approach doesn't necessarily work in Rails 4.

Another option is to override the rake task itself in your gem.

Problem

I'd like `rake db:schema:load` to use a `db/schema.rb` that's not located in my app, but in one of my gems. This already works for `db:seed` by putting `config.paths['db/seeds'] = Core::Engine.paths['db/seeds'].existent` in my `application.rb`. (Core is a gem that's also a Rails engine). However, there is no `db/schema.rb` path in `config.paths` and `config.paths['db'] = Core::Engine.paths['db'].existent` has no effect. What's the easiest way to get this done?

Original source