Function activitypub_federation::protocol::helpers::deserialize_one_or_many

source · 
pub fn deserialize_one_or_many<'de, T, D>(
    deserializer: D
) -> Result<Vec<T>, D::Error>
where
    T: Deserialize<'de>,
    D: Deserializer<'de>,
Expand description

Deserialize JSON single value or array into Vec.

Useful if your application can handle multiple values for a field, but another federated platform only sends a single one.

#[derive(serde::Deserialize)]
struct Note {
    #[serde(deserialize_with = "deserialize_one_or_many")]
    to: Vec<Url>
}

let single: Note = serde_json::from_str(r#"{"to": "https://example.com/u/alice" }"#)?;
assert_eq!(single.to.len(), 1);

let multiple: Note = serde_json::from_str(
r#"{"to": [
     "https://example.com/u/alice",
     "https://lemmy.ml/u/bob"
]}"#)?;
assert_eq!(multiple.to.len(), 2);
Ok::<(), anyhow::Error>(())