For serializing Serde trait objects you should use erased-serde
.
#[macro_use]
extern crate serde_derive;
#[macro_use]
extern crate erased_serde;
extern crate serde;
extern crate serde_json;
#[derive(Serialize)]
struct Card {
sections: Vec<Section>,
}
#[derive(Serialize)]
struct Section {
header: String,
widgets: Vec<Box<dyn WidgetTrait>>,
}
#[derive(Serialize)]
struct Image {
image_url: String,
}
#[derive(Serialize)]
struct KeyValue {
top_label: String,
content: String,
}
trait WidgetTrait: erased_serde::Serialize {}
impl WidgetTrait for Image {}
impl WidgetTrait for KeyValue {}
serialize_trait_object!(WidgetTrait);
fn main() {
let card = Card {
sections: vec![
Section {
header: "text".to_owned(),
widgets: vec![
Box::new(Image {
image_url: "img".to_owned(),
}),
Box::new(KeyValue {
top_label: "text".to_owned(),
content: "text".to_owned(),
}),
],
},
],
};
println!("{}", serde_json::to_string_pretty(&card).unwrap());
}