Function wread_data_mongodb::crud_repository::_find_one_by_field

pub async fn _find_one_by_field<'_, '_, T>(
    field_name: String, 
    value: String, 
    collection_name: &'_ str, 
    db: &'_ Database
) -> Result<Option<T>, Error> where
    T: Serialize + Deserialize<'a>,