How to avoid a Heart that needs a default trait for a field that skips serialization?

Question

I have this structure, which is created by deserialization using Serde, and I want to have in it a field of type Url that is not deserialized:

 #[derive(Deserialize, Debug)] pub struct Flow { #[serde(skip_deserializing)] pub source: Url, } 

Playground

Serd complains about Url not matching the Default attribute. I tried with and without getting Default . Am I the only option for me to implement the Default trait for Url myself?

Answer 1

You can use #[serde(default = "path")] in the field to give a function with the signature fn() -> Url , which should be called if the field is absent.

Answer 2

It is also possible to implement Deserialize and handle missing values ​​accordingly.