Rust 在 JSON 序列化时复用结构体字段

依赖

[dependencies]
serde = { version = "1", features = ["derive"] }
serde_json = { version = "1" }

示例

参考 https://serde.rs/attr-flatten.html

#[derive(serde::Serialize, serde::Deserialize, Debug, Copy, Clone)]
#[serde(rename_all(serialize = "camelCase", deserialize = "camelCase"))]
pub struct PageRequest {
    pub page: i32,
    pub size: i32,
}

#[derive(serde::Serialize, serde::Deserialize, Debug)]
#[serde(rename_all(serialize = "camelCase", deserialize = "camelCase"))]
pub struct PageResponse<T> {
    #[serde(flatten)]
    page_request: PageRequest,
    total: i64,
    content: Vec<T>,
}

impl Default for PageRequest {
    fn default() -> Self {
        Self { page: 1, size: 10 }
    }
}

fn main() {
    // language=json
    let json = r#"{ "page": 1, "size": 5, "total": 100, "content": [1, 2, 3, 4, 5] }"#;

    let page_response = serde_json::from_str::<PageResponse<i32>>(json).unwrap();
    println!("{page_response:?}");

    let json = serde_json::to_string_pretty(&page_response).unwrap();
    println!("{json}")
}