How to open files from better_errors with RubyMine on Linux

I recently noticed that better_errors allows you to to open files from within your favorite editor Show archive.org snapshot . However it was not so easy to get rubymine:// links to work on Gnome/Linux. Here is how it finally worked for me:

Step 1: Add a Desktop launcher Show archive.org snapshot

Add this file to ~/.local/share/applications/rubymine.desktop:

Copy[Desktop Entry]
Version=1.0
Type=Application
Encoding=UTF-8
Name=Rubymine
Exec=sh -c '/snap/bin/rubymine ${0#"rubymine://"}' %u
Terminal=false
StartupNotify=false
Categories=Application;
MimeType=x-scheme-handler/rubymine;

Note the Exec madness:

• You might have to adjust the path to match your executable (which rubymine) depending on how you have installed rubymine
• RubyMine does not know how to handle arguments like rubymine://Gemfile. We have to strip the protocol
• The rubymine:// prefix is thus stripped from %u using some weird shell parameter expansion Show archive.org snapshot syntax

Step 2: Map the rubymine mime type to the new launcher

Add the following to ~/.config/mimeapps.list:

Copyx-scheme-handler/rubymine=rubymine.desktop

Step 3: Test your desktop entry

• Does gio mime x-scheme-handler/rubymine suggest Registered applications: rubymine.desktop?
• Does xdg-open "rubymine:///etc/hosts" open the hosts-file in RubyMine?

Step 4: Tell better_errors to use your opener

The BETTER_ERRORS_EDITOR_URL Show archive.org snapshot environment variable can be used to tweak better_errors:

Copyexport BETTER_ERRORS_EDITOR_URL="rubymine://%{file_unencoded}"

Step 5: Try it out!

Restart your server (in a new terminal!) and add a raise statement to your local application.Does better_errors link to your file system?
Make sure that better_errors is at least on Version 2.9 or newer, the BETTER_ERRORS_EDITOR_URL variable was introduced in 2020.