Env is not correct when preloading

[jpalermo]

When a new Spring::Application is created it calls preload first. However, it does this with the ENV settings from when the Spring server was first started.

This can cause preloading to fail if you are trying to set your database connection string using a DATABASE_URL.

If you first started spring in a RAILS_ENV that did not require DATABASE_URL to be set, because it is in the database.yml file. Then you try to start a console in another RAILS_ENV that requires a DATABASE_URL, the preload fails because it does not have DATABASE_URL set when doing the preload.

[eval]

Related: #267

As a workaround I added this to config/spring.rb:

Spring.after_fork do
  ActiveRecord::Base.remove_connection
  ActiveRecord::Base.configurations = { Rails.env.to_sym => ENV['DATABASE_URL'] }
  ActiveRecord::Base.establish_connection
end 

YMMV as I use DATABASE_URL for all Rails envs and don't use config/database.yml.