Inquiry: does this make deserializing HashMap<Unicase, ...> possible?

[isosphere]

(note: I'm new to Rust)

I think this is related to serde-rs/serde#723 which seems to not be resolved yet.

I have a JSON response I want to deserialize, but I want the keys of a particular hashmap to be case-insensitive.

The following throws an error (mismatched types, expected vec etc), and I think I understand why:

    #[serde(default, with = "unicase_serde::unicase")]
    results: Vec<HashMap<UniCase<String>, Option<String>>>

I don't think I can use that "with" line unless the following type is a straight-up UniCase, which it is not, though it contains one.

Is what I'm attempting possible right now? My fallback is to do some slow upper/lower casing over the whole structure after the initial deserialization to String. Not ideal, but I'll survive.

[lawliet89]

Welcome to Rust!

No, you can't do this at the moment unfortunately. You are right that it relates to serde-rs/serde#723.

The current workaround involves writing some painful wrapper types and then manually implementing Serialize and Deserialize for them.

struct WrapperString(pub UniCase<String>);

In this case, it will help if you impl Deref for this type so that you can call the methods of the wrapped type easier without having to resort to test_string.0.method().

If you are not sure how to proceed from here, I can cook up some example code for you.

[isosphere]

Darn.

Thank you for your reply and offer. For the moment I will just make-do with case sensitivity, it's not entirely necessary for my use case, just very nice to have.

I'll revisit if progress is made with that serde issue!

[lawliet89]

To add on, FWIW, I have commented on seanmonstar/unicase#41 to try and get this functionality implemented directly in the unicase crate so that we don't have to workaround this.