deploying-new-changes-to-heroku.md

Deploying new changes to Heroku

Prerequisites

• Heroku CLI is already installed on your machine.
• Make sure that you're logged in. If not, run heroku login. You will be prompted to enter your login credentials in the browser.

Execution

You only need to execute a couple of commands to get things done. The first command will push your latest changes to your Heroku app. The second command will apply new database migrations to your heroku app.

If you're working on a Git branch other than main, run the following:

git push heroku ${LOCAL_BRANCH NAME}:main

Otherwise, just push to main.

git push origin main

We can now apply new database migrations.

heroku run rake db:migrate

Resetting the PostgreSQL database on Heroku

Refer to this GitHub gist for details. Run the following commands:

heroku restart
heroku pg:reset $DATABASE_NAME --app twitter-rails-api
heroku run rake db:migrate
heroku run rake db:seed

Make sure to replace $DATABASE_NAME with the database named automatically configured by Heroku for you.

Just go to Heroku → App (twitter-rails-api) → Resources → Heroku Postgres → Settings → Database Credentials → View Credentials. From there, you can copy the custom command (see the Heroku CLI for details).

Notes

• Not all Rails tasks (Rake commands) are supported by Heroku.
• "The db:reset task is not supported. Heroku apps do not have permission to drop and create databases. Use the heroku pg:reset command instead."

Related issues

• #32

References

• GitHub Gist - How to reset PG database on Heroku?
• Heroku Dev Center - Running Rake Commands - Limitations
• Heroku Dev Center - Getting Started on Heroku with Rails 7.x
• Heroku Dev Center - The Heroku CLI