This describes the workflow to use Heroku as a staging environment. It assumes you already have an existing heroku app in production.
# rename your git remote heroku to something else like production
git remote rename heroku production
# so now you will push as: git push production master
# create the staging app
heroku apps:create staging-appname
# rename the heroku to staging
git remote rename heroku staging
# As heroku only accept master branch to deploy, you have to push your staging branch to heroku's master branch (assuming your local branch for staging is staging)
git push staging staging:master
# Sending heroku commands in multiple app/environment
heroku run rake db:seed --app staging-appnam
# Tired of writing --app all the time?
# note that staging heroku remote refers to the branch, not the app name
git config heroku.remote staging
heroku run rake db:seed # works on staging now!
Thanks so much !! It's Helpful...