'Can't start brand new rails app on Heroku

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.

ruby-on-railsheroku


Solution 1:[1]

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

Solution 2:[2]

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?.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Madonkadonk
Solution 2 Jess Alejo

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