[SOLVED] Heroku Deploy: URI::InvalidURIError: bad URI(is not URI?): ://user:pass@127.0.0.1/dbname

Heroku Deploy: URI::InvalidURIError: bad URI(is not URI?): ://user:pass@127.0.0.1/dbname

I have a project with a Vue frontend and a rails backend. It's just a very simple API on the backend, no database or anything. It's working fine locally but now I want to deploy it on Heroku.

However, when I run it I get the following error.

-----> Detecting rake tasks
 !
 !     Could not detect rake tasks
 !     ensure you can run `$ bundle exec rake -P` against your app
 !     and using the production group of your Gemfile.
 !     rake aborted!
 !     URI::InvalidURIError: bad URI(is not URI?): ://user:pass@127.0.0.1/dbname
  ...
  ...
/activerecord-6.0.2.1/lib/active_record/railties/databases.rake

Based on various SO posts/Heroku documentation, I have already tried:

bundle exec rake -P RAILS_ENV=production - everything looks ok
adding the rake dependency in Gemfile
removing the sqlite dependency in Gemfile
removing the BUNDLED WITH from Gemfile.lock

But still the same error.

I guess it's related to my database config, but I don't have any database on my project so this seems like an unnecessary task anyway. I tried commenting out railties from my Gemfile but it's still there as a dependency for other gems. When I deploy after making this change, it still hits the same task and fails.

Link to repo branch

Solution

Needed to fully remove use of ActiveRecord from the project. As Max commented, in a new app this can be done by doing rails new app_name --skip-active-record --api, to do this for an existing project see this explanation