Question

I am developing on an open source rails application and as a rails 3 project, it includes a Gemfile. The application is also dependent on a database adapter for active record. I can specify a specific adapter (like gem 'sqlite3') within the Gemfile but this is not what I want to do. I advertise the app as beeing compatible with all the adapters active record is compatible with. Is there any way to specify that the app depends on a single database adapter (out of a selection) but that one is sufficient? Something like

any_of do
  gem 'sqlite'
  gem 'mysql'
  etc.
end

Thanks for any help or suggestions how to approach the problem differently.

Answer 1

I just recently installed something that generated an error, until I realized how they handled this.

group :postgresql do
  gem 'pg'
end

group :mysql do
  gem 'mysql2'
end

and then when you run bundler:

bundle install --without postgresql