Custom JSON property Deserialization in Rust with Serde

serde_desrialize_with.rs

#[derive(Serialize, Deserialize, Debug)]
struct ManifestInfo {
    version:String,

    #[serde(rename(serialize = "url", deserialize = "mobileWorldContentPaths"), alias="url", deserialize_with = "deserialize_mobile_world_content_Paths")]
    url:String,
}

fn deserialize_mobile_world_content_Paths<'de, D>(deserializer: D) -> Result<String, D::Error> where D: serde::de::Deserializer<'de>
{
    #[derive(Deserialize)]
    #[serde (rename="mobileWorldContentPaths")]
    struct MobileWorldContentPaths {
        en: String,
    }

    //TODO: move to URL base to constant
    MobileWorldContentPaths::deserialize(deserializer).map(|mobileWorldContentPaths| format!("https://www.bungie.net{}",mobileWorldContentPaths.en))
}