[RUBY] Can't upload to heroku

environment

・ Rails 6.0.3.2 ・ Mysql Ver 14.14 Distrib 5.6.47 ・ Osx10.15

Synopsis

When I created a WEB application with Rails and deployed it to heroku for the first time, I could not do it well or the screen was not displayed, so there are careless mistakes, but I will post the countermeasures at that time.

Problem 1 (app name)

The underscore" _ " cannot be used in the app name or file name. In my case, I couldn't push to Github either. The hyphen"-" is available, so in my case I proceeded by changing the hyphen!

Problem 2 (migration)

Did not migrate after deployment. It was my first time, so I didn't notice this simple task. .. ..

git push heroku master

Don't forget to create a DB after that!

heroku run rake db:migrate

Problem 3 (DB type is different)

The DB of heroku was" PostgreSQL "and it was different from my environment (MySQL). Details are described in another article ↓ ・ Https://qiita.com/yamato1491038/items/4884b8d77c2852425cd1

The screen is displayed when you access while pounding! It was sunny and the deployment was completed!