Example
extern crate serde;
extern crate serde_json;
#[macro_use] extern crate serde_derive;
use std::collections::BTreeMap as Map;
#[derive(Serialize)]
struct Resource {
// Always serialized.
name: String,
// Never serialized.
#[serde(skip_serializing)]
hash: String,
// Use a method to decide whether the field should be skipped.
#[serde(skip_serializing_if="Map::is_empty")]
metadata: Map<String, String>,
}
fn main() {
let resources = vec![
Resource {
name: "Stack Overflow".to_string(),
hash: "b6469c3f31653d281bbbfa6f94d60fea130abe38".to_string(),
metadata: Map::new(),
},
Resource {
name: "GitHub".to_string(),
hash: "5cb7a0c47e53854cd00e1a968de5abce1c124601".to_string(),
metadata: {
let mut metadata = Map::new();
metadata.insert("headquarters".to_string(),
"San Francisco".to_string());
metadata
},
},
];
let json = serde_json::to_string_pretty(&resources).unwrap();
// Prints:
//
// [
// {
// "name": "Stack Overflow"
// },
// {
// "name": "GitHub",
// "metadata": {
// "headquarters": "San Francisco"
// }
// }
// ]
println!("{}", json);
}
