[Docker] How to update using a container on Heroku and how to deal with Migrate Error
environment
macOS 10.15.5 Rails 5.2.4.2 Docker 19.03.12
How to update on Heroku
When deploying with Heroku in the Docker environment and then updating, execute the following command to update the contents of the Docker container.
terminal
#Log in
$ heroku container:login
#push
$ heroku container:push web
#Reflect at the end
$ heroku container:release web
This will update the contents of the Docker container deployed on Heroku!
If you get an error saying "ActiveRecord :: PendingMigrationError" ...
If there is no problem when reflecting it on the browser in the Docker environment, but a migration error occurs on Heroku ...
In that case, you need to migrate separately on Heroku.
terminal
$ heroku run rails db:migrate
After that, if you reload Heroku without deploying it as it is, it will be displayed normally in the browser!