Implement my traits on generated Enum

[dimitri-correia]

Problem Description

I'm trying to iterate over the values of an enum generated by Prost, which is something I typically achieve using the Strum crate with the EnumIter trait. However, since the enum is generated by Prost (prost-build), I can't directly use Strum here.

What I’ve Tried

I looked for a way to iterate over the Prost-generated enum, but it seems that this isn’t currently supported, or at least I couldn’t find a method. My workaround idea was to add the enum manually in my Rust code rather than defining it in my .proto file, using "Tag Inference for Existing Types" with use prost::{Enumeration, Message};. However, this leads to errors since the .proto file requires the enum to be defined within it.

Proposal

Could we consider adding a feature flag in Prost to allow additional traits on enums, such as an iterator? This would make it easier to iterate over enums generated from .proto files without additional workarounds.
I can start to look into creating a PR for this, but I want to be sure it's something that is wanted and possible to achieve.

What are your thoughts on this?

[caspermeijn]

I think you are looking for the `prost_build::Config` type. You can configure the generated output to derive strum. You probably want to use https://docs.rs/prost-build/latest/prost_build/struct.Config.html#method.type_attribute The existence of `Config` is not documented well. Where did you look to find documentation about solving this issue? Are you willing to open a PR to add some example? 9 nov. 2024 14:00:24 Dimitri CORREIA ***@***.***>:

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*Problem Description* I'm trying to iterate over the values of an enum generated by Prost, which is something I typically achieve using the Strum crate[https://docs.rs/strum_macros/latest/strum_macros/derive.EnumIter.html] with the *EnumIter* trait. However, since the enum is generated by Prost (prost-build), I can't directly use Strum here. *What I’ve Tried* I looked for a way to iterate over the Prost-generated enum, but it seems that this isn’t currently supported, or at least I couldn’t find a method. My workaround idea was to add the enum manually in my Rust code rather than defining it in my *.proto* file, using "Tag Inference for Existing Types" with *use prost::{Enumeration, Message};*. However, this leads to errors since the *.proto* file requires the enum to be defined within it. *Proposal* Could we consider adding a feature flag in Prost to allow additional traits on enums, such as an iterator? This would make it easier to iterate over enums generated from *.proto* files without additional workarounds. I can start to look into creating a PR for this, but I want to be sure it's something that is wanted and possible to achieve. What are your thoughts on this? — Reply to this email directly, view it on GitHub[#1185], or unsubscribe[https://github.com/notifications/unsubscribe-auth/AAJZ7OXOKTBVHGA5LBBWMW3Z7YIPLAVCNFSM6AAAAABRPE5LJSVHI2DSMVQWIX3LMV43ASLTON2WKOZSGY2DMMBZHEYTONY]. You are receiving this because you are subscribed to this thread. [Tracking afbeelding][https://github.com/notifications/beacon/AAJZ7OUI3AY55EEVPF5A2BTZ7YIPLA5CNFSM6AAAAABRPE5LJSWGG33NNVSW45C7OR4XAZNFJFZXG5LFVJRW63LNMVXHIX3JMTHJ3OCE5E.gif]