Issues related to error handling

[Hans-Wu-cn]

this is my code:

#[handler]
pub async fn register(req: &mut Request,res:&mut Response) -> RebarResult<PodPool>{
    let mut parms = req.parse_json::<Pod>().await?;
    register_pod(&mut parms).await?;
    let result=get_rister_pool().await?;
    result
}

#[async_trait]
impl Writer for RebarError {
    async fn write(mut self, _req: &mut Request, depot: &mut Depot, res: &mut Response) {
        res.render(Json());
    }
}

I want to know how to respond to different information based on specific error types, because I don't know how to obtain the response content in the handler in the write function ,and have error in Writer trait: Only traits defined in the current crate can be implemented for arbitrary types

[chrislearn]

I don't quite understand your needs, What content you want to obtain form response?

[Hans-Wu-cn]

I don't quite understand your needs, What content you want to obtain form response?

1. I want to handle all my exceptions uniformly. For example, if an IO exception occurs, I will use my custom exception capture and processing response JSON to the front-end
2. It seems that my handler cannot compile now. He said I did not implement salvo:: Writer, but I actually did. log: the trait bound Result<HashMap<std:: string:: String, Vec<Pod>, RebarError>: salvo:: Writer is not satisfied [E0277] Help: the trait salvo:: Writer is implemented for Result<T, E>

#[handler]
pub async fn register(req: &mut Request,res:&mut Response) -> RebarResult<PodPool>{
    let mut parms= req.parse_json::<Pod>().await.unwrap();
    register_pod(&mut parms).await?;
    let result=get_rister_pool().await;
    result
}

[chrislearn]

I think it is because HashMap is not implement Writer, you can wrap it use Json.

[Hans-Wu-cn]

I think it is because HashMap is not implement Writer, you can wrap it use Json.

What does packaging use mean
Can you help me look at the second question

[chrislearn]

我不说了，你可能是HashMap没有实现Writer, 你可以 Json 包一下看看。