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Fix example for accessing inner extrator errors (#2095)

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David Pedersen 2023-07-16 01:40:31 +02:00 committed by GitHub
parent b34715fe81
commit 6f7ff85565
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1 changed files with 24 additions and 3 deletions
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27
axum/src/docs/extract.md
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@ -348,13 +348,16 @@ async fn handler(
}
}
// attempt to extract the inner `serde_json::Error`, if that succeeds we can
// provide a more specific error
// attempt to extract the inner `serde_path_to_error::Error<serde_json::Error>`,
// if that succeeds we can provide a more specific error.
//
// `Json` uses `serde_path_to_error` so the error will be wrapped in `serde_path_to_error::Error`.
fn serde_json_error_response<E>(err: E) -> (StatusCode, String)
where
E: Error + 'static,
{
if let Some(serde_json_err) = find_error_source::<serde_json::Error>(&err) {
if let Some(err) = find_error_source::<serde_path_to_error::Error<serde_json::Error>>(&err) {
let serde_json_err = err.inner();
(
StatusCode::BAD_REQUEST,
format!(
@ -382,6 +385,24 @@ where
None
}
}
#
# #[tokio::main]
# async fn main() {
# use axum::extract::FromRequest;
#
# let req = axum::http::Request::builder()
# .header("content-type", "application/json")
# .body(axum::body::Body::from("{"))
# .unwrap();
#
# let err = match Json::<serde_json::Value>::from_request(req, &()).await.unwrap_err() {
# JsonRejection::JsonSyntaxError(err) => err,
# _ => panic!(),
# };
#
# let (_, body) = serde_json_error_response(err);
# assert_eq!(body, "Invalid JSON at line 1 column 1");
# }
```
Note that while this approach works it might break in the future if axum changes