Allow specifying allowed options?

[richtier]

It would be great to detect an env var has been misconfigured by optionally providing a list of valid choices for the value.

It seems this is not currently supported.

Is this on the roadmap? I'm happy to contribute this feature.

[Jafnee]

@richtier @joke2k What do you think of having like this:

# (env variable, list of choices, optional default value)
MY_SETTING = env.choices('MY_ENV', ['choice_1', 'choice_2', 'choice_3'], 'choice_3')

Or maybe as a new kwarg instead:

MY_SETTING = env.str('MY_ENV', choices=['choice_1', 'choice_2', 'choice_3'], 'choices_3')
MY_SETTING = env.int('MY_ENV', choices=[123, 456, 789, 0], 0)

[QuentinAndre11]

@richtier @joke2k I subclassed my Enum classes with a "cast" function which did the trick for string based enums, are you interested in a PR based on the idea of adding the Enum type ?

[pataquets]

Just adding an use case which clearly would benefit from this (and would also make for a good example code snippet): the LOGLEVEL variable, which could only be DEBUG, INFO, etc.

[pataquets]

@sergeyklay @joke2k In case anyone wants to pick it up, would such a PR be acceptable? Seems quite a low-risk, self-contained feature with no apparent side-effects. Wdyt?

@QuentinAndre11: is your code posted publicly somewhere to check?
Also, calling to those still interested in contributing to kindly chime in/thumbs up.

[Swannbm]

I will do a PR for it. It will be my first PR so be gentle :)

[Swannbm]

Alright, feedback are most welcome !