Rust 如何在 Serde 中序列化或反序列化 Arc

我有一个 struct ，它包含自己类型的子 struct .这些子元素被Arc个包裹着，我打serde_json::to_string的时候遇到了问题.我的 struct 是:

#[derive(Serialize, Deserialize)]
pub struct Category {
    pub id: i32,
    pub name: String,
    pub parent_id: i32,
    pub children: Vec<Arc<Category>>,
}

这会产生错误the trait 'serde::Serialize' is not implemented for 'std::sync::Arc<db::queries::categories::Category>'我try 了几种不同的方法来实现序列化，例如:

#[serde(serialize_with = "arc_category_vec")]
pub children: Vec<Arc<Category>>

fn arc_category_vec<S>(value: &Vec<Arc<Category>>, serializer: S) -> Result<S::Ok, S::Error>
where
    S: Serializer,
{
    let mut seq = serializer.serialize_seq(Some(value.len()))?;
    for e in value {
        seq.serialize_element(e.as_ref())?;
    }
    seq.end()
}

这对我没有帮助，因为我犯了同样的错误.我也试过:

impl Serialize for Arc<Category> {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let mut state = serializer.serialize_struct("Category", 4)?;

        state.serialize_field("id", &self.id)?;
        state.serialize_field("name", &self.name)?;
        state.serialize_field("parent_id", &self.parent_id)?;
        state.serialize_field("children", &self.children)?;
        state.end();
    }
}

但这就产生了impl doesn't use types inside crate的误差

我可能不需要反序列化，因为此时序列化更重要.