Simple rake task to deploy staging and production apps to Heroku. Based on: https://gist.github.com/njvitto/362873

_instructions.md

Deploying Via Rake Task

• Edit the PRODUCTION_APP and STAGING_APP variables at the top of the file.
• Set the heroku remotes by running rake:set_remotes
• Once you're ready to deploy, you can run rake deploy:production or rake deploy:staging

deploy.rake

# Deploy on Heroku in staging and production
namespace :deploy do
  PRODUCTION_APP = 'my-app'
  STAGING_APP = 'my-app-staging'

  # colors
  YELLOW = "\033[33m"
  NOCOLOR = "\033[0m"

  task :staging => [:set_staging_app, :push_staging, :maintenance_on, :migrate, :maintenance_off]
  task :production => [:set_production_app, :push_production, :maintenance_on, :migrate, :maintenance_off]

  task :set_staging_app do
    APP = STAGING_APP
  end

  task :set_production_app do
    APP = PRODUCTION_APP
  end
  
  task :set_remotes do
    puts "#{YELLOW}Creating Heroku remotes in git...#{NOCOLOR}"
    puts `git remote add heroku git@heroku.com:#{PRODUCTION_APP}.git`
    puts `git remote add heroku-staging git@heroku.com:#{STAGING_APP}.git`
  end

  task :push_staging do
    puts "#{YELLOW}Deploying site to Heroku staging server...#{NOCOLOR}"
    puts `git push heroku-staging staging:master` # assumes you're using a "staging" branch
  end

  task :push_production do
    puts "#{YELLOW}Deploying site to Heroku production server...#{NOCOLOR}"
    puts `git push heroku master`
  end

  task :restart do
    puts "#{YELLOW}Restarting app servers...#{NOCOLOR}"
    puts `heroku restart --app #{APP}`
  end

  task :migrate do
    puts "#{YELLOW}Running database migrations...#{NOCOLOR}"
    puts `heroku rake db:migrate --app #{APP}`
  end

  task :maintenance_on do
    puts "#{YELLOW}Turning maintenance mode on...#{NOCOLOR}"
    puts `heroku maintenance:on --app #{APP}`
  end

  task :maintenance_off do
    puts "#{YELLOW}Turning maintenance mode off...#{NOCOLOR}"
    puts `heroku maintenance:off --app #{APP}`
  end
end

How about this?

  task :set_remotes do
    puts `git remote add heroku git@heroku.com:my-app.git`
    puts `git remote add heroku-staging git@heroku.com:my-app-staging.git`
  end

Also, don't you think it's a little confusing to have the :off task be maintenance:on and vice versa? Shouldn't the :on task be maintenance:on?

Also, might you want to put it into maintenance before you deploy and take it out of maintenance after, not just during the migration step?