Can't overwrite settings with underscores using env varibles

[brizental]

So, I have a default.json that I can overwrite using my custom prefixed env variables (just like https://github.com/mehcode/config-rs/blob/master/examples/hierarchical-env/src/settings.rs#L58).

I tried adding a key in that json that has underscores in it { "like_this": "blabla" }. I expected it to be overwritten by an env varible like APP_LIKE_THIS but that doesn't work.

Is this a bug or am I doing something wrong?

[brizental]

Closing this because I understand now that this is a design choice.

[mehcode]

@brizental This behavior was changed in 0.9. Env variables match with underscores by default as you would expect. If you want nesting behavior you need to now opt-in to it.

// `APP_FOO_BAR` will match `foo_bar`
Environment::with_prefix("APP");

// `APP_FOO_BAR` will match `foo.bar` (nested struct)
// This was the default behavior in 0.8
Environment::with_prefix("APP").separator("_");

// `APP_FOO__BAR_BAZ` will match `foo.bar_baz` (nested struct)
Environment::with_prefix("APP").separator("__");