Ruby on Rails

I have the production and staging site on two different server ips. But the database, another server ip, is the same database used by both production and staging. When i set up the capistrano deploy task for both the production and staging, should I keep the db role in deploy.rb like this:

deploy.rb

role :db,  "database_ip", :primary => true 

production.rb

role :web, "production_ip" 
role :app, "production_ip"  

staging.rb
role :web, "staging_ip" 
role :app, "staging_ip"  

Or should I do it this way:

production.rb
role :web, "production_ip" 
role :app, "production_ip"  
role :db,  "database_ip", :primary => true 

staging.rb
role :web, "production_ip" 
role :app, "production_ip"  
role :db,  "database_ip", :primary => true