Add environment to capistrato deploy

config/deploy.rb

@@ -47,6 +47,9 @@ namespace :deploy do
       # Your restart mechanism here, for example:
        within release_path do
          #execute :rake, 'cache:clear', as: 'www-data'
+         with rails_env: fetch(:rails_env) do
+            execute :rake, "db:migrate"
+         end
          execute :rake, 'dedigest_assets', as: 'www-data'
        end
        execute :chown, "-R www-data:www-data", release_path