What is the default configuration file path for a specified environment?

[ma11hew28]

According to Puma README: Configuration file:

If an environment is specified . . . through the RACK_ENV environment variable, the default file location will be config/puma/environment_name.rb.

Is this still true for Puma 3.8.2 with Ruby 2.4.1?

[nateberkopec]

Yes.

[ma11hew28]

OK. Sorry. Thank you. :•)

[ma11hew28]

Hmm... 🤔 When I run the command below, Puma seems to use its default configurations instead of the ones I've specified in config/puma/development.rb.

RACK_ENV=development bundle exec puma --debug

How should I debug this?

[ma11hew28]

Oh, nice! I found this handy method called p. 🤓

So, I added p @options[:environment] right above lib/puma/configuration.rb:194 and then ran Puma again (with the command in my comment above). And, the output showed that @options[:environment] is a Proc. Huh?

Ahah! It's defined as a lambda literal at lib/puma/configuration.rb:183.

Adding .call to the end of @options[:environment] on line 194 seemed to fix this issue for me.

p to the rescue! 🎉