Function wread_data_mongodb::crud_repository::_find_one_by_field

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