[Question] How to declare required fields?

Hi, I’m trying out hydra right now because I like having sane defaults and the (java spring-config like) flexibility to configure everything. Looks good so far! 😃

I have a CLI app that has two required fields that need to be provided by the user and can’t have defaults. I want to use strict mode, so I declared those in my config file. But if I leave them empty, I get None as the value. Is there a way to mark those as required like in argparse and have hydra print usage/help if they are not delivered?

Thanks!

[omry]

Hi Jonas, Thanks for your interest in Hydra! Do read the documentation of OmegaConf, it will help you understand what you can do with Hydra.

specifically for your question, you can specify required field with the string ??? (but really, go through the docs 😃 ).

[omry]

Look at the debugging section in the tutorial. What you want to use is the composition trace to understand how your config was actually composed.

Specific answer to your question: Config groups are mutually exclusive, there can be only one env. and that would be the last env, so prod. you want to put your scaffolding somewhere else, either in a different config group or in the default.yaml file itself (composition order will show you that it’s being composed before the rest of your config group, but after the hydra config groups, allowing you to override hydra from it, but also override it from your config groups.