【Serde】跳过某个属性

环境

• Time 2021-12-06
• Rust 1.57.0
• serde 1.0.130
• serde_json 1.0.72

概念

参考：https://serde.rs/attr-skip-serializing.html

示例

main.rs

use serde::Serialize;

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);
}

总结

使用 serde 序列化时，可以使用属性宏来决定是否进行序列化。

附录