deserialize with custom function

mod.rs

fn de_str<'de, D>(deserializer: D) -> Result<i64, D::Error>
where
    D: serde::de::Deserializer<'de>,
{
    Ok(match Value::deserialize(deserializer)? {
        Value::String(s) => s.parse().map_err(de::Error::custom)?,
        Value::Number(num) => num.as_i64().ok_or(de::Error::custom("Invalide number"))?,
        _ => return Err(de::Error::custom("wrong type")),
    })
}

#[derive(Serialize, Deserialize, Debug)]
pub struct BoothExamplesList {
    pub total: i64,
    #[serde(deserialize_with = "de_str")]
    pub per_page: i64,
    pub current_page: i64,
    pub last_page: i64,
    pub data: Vec<BoothExamplesDatum>,
}