LocomotiveCMS で、複数の Heroku インスタンスを使う ref: http://qiita.com/hal_sk/items/aba8d324638d205b2ce1

carrierwave.rb

(中略)
  when :staging
    # the following configuration works for Amazon S3
    config.storage          = :fog
    config.fog_credentials  = {
      provider:                 'AWS',
      aws_access_key_id:        ENV['S3_KEY_ID'],
      aws_secret_access_key:    ENV['S3_SECRET_KEY'],
      region:                   ENV['S3_BUCKET_REGION']
    }
    config.fog_directory    = ENV['S3_BUCKET']                                                         

  when :production
    # the following configuration works for Amazon S3
    config.storage          = :fog
    config.fog_credentials  = {
      provider:                 'AWS',
      aws_access_key_id:        ENV['S3_KEY_ID'],
      aws_secret_access_key:    ENV['S3_SECRET_KEY'],
      region:                   ENV['S3_BUCKET_REGION']
    }
    config.fog_directory    = ENV['S3_BUCKET']
..

file0.txt

git remote rename heroku staging
git remote add production git@yourappproduction.com:fivejcup.git

file1.txt

heroku addons:add mongohq --remote production

file3.txt

heroku addons:add sendgrid:starter --remote production
cp config/environments/production.rb config/environments/staging.rb

file4.txt

heroku config:set RACK_ENV=staging --app staging_app_name #旧環境の設定をstagingに変更
heroku config:set RAILS_ENV=staging --app staging_app_name #旧環境の設定をstagingに変更
heroku config:add BUNDLE_WITHOUT=development:test --app production_app_name #新環境の設定を追加
heroku config:add HEROKU_API_KEY=<YOUR HEROKU API KEY> --app production_app_name #新環境の設定を追加
heroku config:add HEROKU_APP_NAME=<YOUR APP NAME> --app production_app_name #新環境の設定を追加
heroku config:add S3_KEY_ID=<YOUR S3 KEY ID> --app production_app_name #新環境の設定を追加
heroku config:add S3_SECRET_KEY=<YOUR S3 SECRET KEY> --app production_app_name #新環境の設定を追加
heroku config:add S3_BUCKET=<YOUR S3 BUCKET NAME> --app production_app_name #新環境の設定を追加
heroku config:add S3_BUCKET_REGION=<YOUR S3 BUCKET REGION> --app production_app_name #新環境の設定を追加

file6.txt

git push staging master 

file7.txt

git push production master

mongoid.yml

(省略)
staging:                                                                                               
  sessions:
    default:
      uri: <%= ENV['MONGOHQ_URL'] %>
production:                                                                                               
  sessions:
    default:
      uri: <%= ENV['MONGOHQ_URL'] %>