Can't start brand new rails app on Heroku

Question

Trying to start up a brand new rails project with heroku, followed the steps in https://devcenter.heroku.com/articles/getting-started-with-rails5 and https://devcenter.heroku.com/articles/getting-started-with-rails6. Both times when I try to push to heroku master, I get

remote: -----> Detecting rake tasks
remote: 
remote:  !
remote:  !     Could not detect rake tasks
remote:  !     ensure you can run `$ bundle exec rake -P` against your app
remote:  !     and using the production group of your Gemfile.
remote:  !     /tmp/build_4403463c/config/boot.rb:5:in `require': cannot load such file -- bootsnap/setup (LoadError)
remote:  !     from /tmp/build_4403463c/config/boot.rb:5:in `<top (required)>'
remote:  !     from /tmp/build_4403463c/bin/rake:7:in `require_relative'
remote:  !     from /tmp/build_4403463c/bin/rake:7:in `<main>'
remote:  !

I've tried to surround the bootsnap/setup with a rescue, and it still hits this block.

`ensure you can run \`$ bundle exec rake -P\` against your app`—well, can you? — ChrisGPT was on strike, Dec 23 '20 at 17:09
Yep I double checked both of these, bootsnap is installed and I can run bundle exec rake -P locally, even in production mode. I can't check on my heroku cause I'm failing the first push which means the box is never even created. — Madonkadonk, Dec 23 '20 at 17:50

score 2 · Answer 1 · answered Feb 10 '21 at 00:48

In my case, I have 3 bundler versions installed:

gem list bundler

*** LOCAL GEMS ***

bundler (2.2.5, default: 2.1.4, 1.17.3)

Though 2.1.4 being the default, it seems it is not what being used when I bundle install.

I run bundle _2.1.4_ install and then it updates my Gemfile.lock.

# git diff
BUNDLED WITH
-   2.2.5
+   2.1.4

Then the problem was gone when I git push heroku main. I found these links helpful in troubleshooting my issue: Heroku Rails build failing due to Bootsnap and Rake issues and How to switch bundler version?.

score 1 · Accepted Answer · answered Dec 27 '20 at 05:32

1

Found a solution, In Gemfile.lock I switched RUBY VERSION to ruby 2.6.6p146 and BUNDLED WITH to 1.17.3

answered Dec 27 '20 at 05:32

Madonkadonk

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Can't start brand new rails app on Heroku

2 Answers2