Capistrano 3, Rails 4, database configuration does not specify adapter

Question

When I start

cap production deploy

it fails like this:

DEBUG [4ee8fa7a] Command: cd /home/deploy/myapp/releases/         


        

Answer 1

Seems to be a bug in capistrano-rails.

There is a task (rails.rake) that sets the environment either from rails_env or stage:

namespace :deploy do
  before :starting, :set_rails_env do
    set :rails_env, (fetch(:rails_env) || fetch(:stage))
  end
end

But this task isn't called before i.e. assets:precompile. So this:

namespace :assets do
  task :precompile do
    on roles :web do
      within release_path do
        with rails_env: fetch(:rails_env) do
          execute :rake, "assets:precompile"
        end
      end
    end
  end
end

fails because rails_env is nil if it isn't set explicitly.

If I have the time to dig a little deeper I'll file a bug report.