Navigate to Ruby function definition in VS Code

Thanks to Chris’s suggestion, I got a better error message. Following that lead, I found that Ruby’s code navigation seems to require a second language server: solargraph. I don’t know if you require both, but I can now navigate to Ruby definitions. I also have to autocomplete working.

Update [2022]

Coming back to this with VSCode 1.67.0 on Ubuntu 22.04, I no longer require solargraph. However, I did struggle a bit to figure out the exact steps to get it working:

1. Open File: Preferences: Extensions.

2. Search for Ruby by Peng Lv, and install it.

3. Open File: Preferences: Settings.

4. Click the button in the top right to open the JSON settings file:
   

5. Add these settings:

   {
       "ruby.useLanguageServer": true,
       "ruby.intellisense": "rubyLocate"
   }
   

6. Restart VSCode.