is_some() cannot be followed by has_length()

[kirushik]

I'm trying to build some assertions on serde_json::Value (parsing result from my JSON-RPC api).
I'm doing this:

let json : Value = serde_json::from_str(&query_result).unwrap();
assert_that(&json["result"].as_array()).is_some().has_length(3);

and expect it to work, since is_some() returns Spec over the contained object.

Surprisingly, I'm getting an error:

error: no method named `has_length` found for type `spectral::Spec<'_, &std::vec::Vec<serde_json::Value>>` in the current scope

What am I doing wrong here?

PS. I'm on Rust 1.16 stable, on Windows (stable-x86_64-pc-windows-msvc).
Spectral version is 0.6.0, installed from crates.

[kirushik]

At the same time

assert_that(&Some(vec![1,2,3])).is_some().has_length(5);

works as expected, so my issues is somewhere in spectral+serde combination...

[kirushik]

Well,

assert_that(&Some(&vec![1,2,3])).is_some().has_length(5);

fails in the same way as my original one did.

So the issue is with that additional reference inside of Option, sorry for not being patient enough right from the beginning.

Looks like this is an additional, not yet implemented feature.

Should I keep this issue open then?
Perhaps I'll submit a PR with an implementation, but no promises or estimates...

[cfrancia]

Looks like it's missing an implementation for &Vec. I guess I never thought of the case where you'd be unwrapping a reference to a Vec via is_some().

Simple solution would be to just copy-paste the existing implementation with the new bound, but it'd be nice to just use a macro or something to clean it up a bit.

I'm happy to wait for you to submit a PR, or otherwise I'm also happy to fix it up when I have a moment.