Respect serde renames for paths

[leebenson]

Is there an obvious way to have garde respect serde rules (specifically, serde(rename_all = "camelCase")) for validation paths?

My public-facing input types are camel-cased to match the Javascript convention, but internally are snake-cased for Rust. When mapping errors back to form fields, I'd like to reflect the same convention.

Thanks.

[jprochazk]

There is not, unfortunately. I don't know what the convention for that is, but it feels wrong to read serde's attributes for this.

Implementing our own rename attributes would probably look like:

• Parsing the new attributes (rename on field-level, rename_all on struct-level)
• Following the code to thread those attributes through to this line and update the key.to_string() based on whatever rename rule is used (either the struct-level case convert, or field-level rename to specific key, prioritizing the field-level over struct-level rename)

[leebenson]

Thanks. Agreed, I think a garde-level rename makes sense 👍🏻 FWIW, I'm using Poem's #[oai(rename_all...) attribute for serialising input, which is effectively the same approach.

[tsidea]

Implemented #157 using guidance from @jprochazk's reply. Did not implement the rename_all as it was a bit out of scope for me.

[bourumir-wyngs]

I also have problems with this while integrating garde to serde-saphyr. The initial idea was that serde-saphyr could print exact location of the failing validation in YAML file, complete with excerpt, same as it does for syntax errors. Unfortunately I quickly realized that garde reports Rust field names, while my serde/yaml processor can only see these names as defined in the YAML.

As a work arround, I currently check for common renames, like renaming between snake, camel or kebab case, or stripping r# prefix. This covers most of legitimate cases, but if someone will rename cat into dog, there is nothing YAML processor currently can do, I end up with reporting Rust path only. Possibility to add garde own rename that should mimmic serde rename would allow to patch all such corner cases easily. Would be a big fan of this feature.