Capistrano symlink database.yml task error - ruby-on-rails-3

Question

I'm running a Rails 3.2.x app with Capistrano 2.12.0. I've pulled my database.yml out of github/version control and manually placed a copy under /home/deploy/myapp/shared/config/database.yml
I'm trying to get my deploy.rb to symlink this file using before:assets:precompile so that the file is symlinked in the release directory and the deployment can continue. Here is the error I get:
/Users/james/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/capistrano-2.12.0/lib/capistrano/configuration/callbacks.rb:103:in `on': please specify either a task name or a block to invoke (ArgumentError)
Here is what my deploy.rb looks like:
deploy.rb
require "bundler/capistrano"
set :whenever_command, "bundle exec whenever"
require "whenever/capistrano"
set :shared_children, shared_children + %w{public/uploads}
server "72.14.181.22", :web, :app, :db, primary: true
set :application, "myapp"
set :user, "deploy"
set :deploy_to, "/home/#{user}/#{application}"
#set :deploy_via, :remote_cache
set :use_sudo, false
set :rails_env, "production"
set :scm, "git"
set :repository, "git#github.com:james/#{application}.git"
set :branch, "master"
default_run_options[:pty] = true
ssh_options[:forward_agent] = true
after "deploy", "deploy:cleanup" # keep only the last 5 releases
after "deploy:update"
before "deploy:assets:precompile", "config_symlink"
namespace :deploy do
task :start do ; end
task :stop do ; end
task :restart, :roles => :app, :except => { :no_release => true } do
run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}"
end
desc "reload the database with seed data"
task :seed do
run "cd #{current_path}; bundle exec rake db:seed RAILS_ENV=#{rails_env}"
end
end
task :config_symlink do
run "ln -nfs #{shared_path}/config/database.yml #{release_path}/config/database.yml"
end
Basically what I need to do is symlink the /home/deploy/myapp/shared/config/database.yml to /home/deploy/myapp/current/config/database.yml before the assets precompile so the database can be accessed.
I'm sure I have some sort of syntax error here but could really use some help. I want to keep my database.yml out of version control, leave it in the myapp/shared/config directly and symlink it on deploy for security purposes.
For the longest time I thought I had been doing this, but apparently I hadn't so I need to figure this out.
Any help is greatly appreciated as I don't want to have to resort to keeping database.yml in github/version control.

Answer 1

I think I got this working. It looks like in my original deploy.rb I was calling after "deploy:update" but wasn't passing anything to the callback so it was bombing on me. I've cleaned up my deploy.rb file and have tested deployment to a staging server and it seems to work.
deploy.rb updated
require "bundler/capistrano"
set :whenever_command, "bundle exec whenever"
require "whenever/capistrano"
set :shared_children, shared_children + %w{public/uploads}
server "72.14.181.11", :web, :app, :db, primary: true
set :application, "myapp"
set :user, "deploy"
set :deploy_to, "/home/#{user}/#{application}"
#set :deploy_via, :remote_cache
set :use_sudo, false
set :rails_env, "production"
set :scm, "git"
set :repository, "git#github.com:james/#{application}.git"
set :branch, "master"
default_run_options[:pty] = true
ssh_options[:forward_agent] = true
before "deploy:assets:precompile", "config_symlink"
after "deploy", "deploy:cleanup" # keep only the last 5 releases
namespace :deploy do
task :start do ; end
task :stop do ; end
task :restart, :roles => :app, :except => { :no_release => true } do
run "#{try_sudo} touch #{File.join(current_path,'tmp','restart.txt')}"
end
desc "reload the database with seed data"
task :seed do
run "cd #{current_path}; bundle exec rake db:seed RAILS_ENV=#{rails_env}"
end
end
task :config_symlink do
run "ln -nfs #{deploy_to}/shared/config/database.yml #{release_path}/config/database.yml"
end