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

Edit: Per this pull request, it's now fixed in version 1.1.0 of capistrano-rails.

Per this Github issue, another fix is to edit your Capfile. Comment out these two lines

#require 'capistrano/rails/assets'
#require 'capistrano/rails/migrations'

and put this line in

require 'capistrano/rails'

which will correctly set your RAILS_ENV variable.

Answer 2

Based on Marc's answer which definitely seems to be the right one,

you can workaround this until it is fixed upstream by adding this to your config/deploy.rb in the "namespace :deploy" block:

  desc 'Provision env before assets:precompile'
  task :fix_bug_env do
    set :rails_env, (fetch(:rails_env) || fetch(:stage))
  end

  before "deploy:assets:precompile", "deploy:fix_bug_env"

This will force loading the env and provisionning RAILS_ENV before assets:precompile is called.

Answer 3

What happens if you add a file:

deploy/production.rb

With this line:

set :stage, :production

Answer 4

Using Cap 3 and capistrano_rails on rails 4 I was getting the same error; in the environment file(s) being deployed, I set

set :stage, :production
set :rails_env, 'production' # even though doc says only need to do this if it's different

Doc here: https://github.com/capistrano/rails

Answer 5

If you're using passenger, you need to add

rails_env production;

in the in web server's (eg: nginx) .conf where you've specified values for passenger_ruby and passenger_root.

Answer 6

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.