Crate Serde

Published: 2023-01-06
Updated: 2024-02-06

Tips and Tricks for working with Serde.

Attributes 🔗

Website: https://serde.rs/attributes.html

Specially noted Container attributes 🔗

#[serde(rename_all = "lowercase")]

Default - Use default for any missing fields

#[serde(default)]

Specially noted Field attributes 🔗

#[serde(rename = "name")]

#[serde(alias = "name")]

Path - Use callable to set default value if field not found. This may also be a trait method.

#[serde(default = "path")]

Default - Use Default::default() if not present. See also default value for a field

#[serde(default)]

Snippets 🔗

Derive

Enums and TOML 🔗

Source: https://stackoverflow.com/questions/57560593/why-do-i-get-an-unsupportedtype-error-when-serializing-to-toml-with-a-manually-i

Using #[serde(tag = "type")] can sometimes resolve Err value: UnsupportedType errors

Transcoding 🔗

Source: https://serde.rs/transcode.html

Going from any self describing format to any other self describing format (Not tested yet, but wanted to be able to find it next time)

use std::io;

fn main() {
    // A JSON input with plenty of whitespace.
    let input = r#"
      {
        "a boolean": true,
        "an array": [3, 2, 1]
      }
    "#;

    // A JSON deserializer. You can use any Serde Deserializer here.
    let mut deserializer = serde_json::Deserializer::from_str(input);

    // A compacted JSON serializer. You can use any Serde Serializer here.
    let mut serializer = serde_json::Serializer::new(io::stdout());

    // Prints `{"a boolean":true,"an array":[3,2,1]}` to stdout.
    // This line works with any self-describing Deserializer and any Serializer.
    serde_transcode::transcode(&mut deserializer, &mut serializer).unwrap();
}