Rust serde序列化到Vec或从Vec序列化到HashMap

我有一个JSON集合,其中包含我想来回序列化为列表表示的映射元素。这是我写的代码:

use serde::{de::DeserializeOwned, Deserialize, Serialize};
use std::{collections::HashMap, hash::Hash};

pub trait GetId<T>
{
    fn get_id(&self) -> &T;
}

/// Serializable collection
#[derive(Serialize, Deserialize, Default, Clone)]
#[serde(from="Vec<V>", into="Vec<V>")]
pub struct Collection<K, V>
where K: Eq + Hash + Clone,
      V: Serialize + DeserializeOwned + GetId<K> + Clone,
{
    data: HashMap<K, V>,
}

impl<K, V> Collection<K, V>
where K: Eq + Hash + Clone,
      V: Serialize + DeserializeOwned + GetId<K> + Clone,
{
    pub fn new() -> Self {
        Collection {
            data: HashMap::new(),
        }
    }

    pub fn insert(&mut self, item: V) -> Option<V> {
        let id = item.get_id().to_owned();
        self.data.insert(id, item)
    }
}

impl<K, V> From<Vec<V>> for Collection<K, V>
where K: Eq + Hash + Clone,
      V: Serialize + DeserializeOwned + GetId<K> + Clone,
{
    fn from(value: Vec<V>) -> Self {
        let mut obj: Collection<K, V> = Collection::new();
        value.into_iter().for_each(|v| { obj.insert(v); });
        obj
    }
}

impl<K, V> Into<Vec<V>> for Collection<K, V>
where K: Eq + Hash + Clone,
      V: Serialize + DeserializeOwned + GetId<K> + Clone,
{
    fn into(self) -> Vec<V> {
        Vec::from_iter(self.data.into_values())
    }
}

我用 From<Vec<V>> 实施和 GetKey<K> trait插入序列化的所有元素 Vec<V> 进入 HashMap<K, V> .

然而,我在这里遇到了生命周期问题,并出现了以下错误:

error[E0283]: type annotations needed: cannot satisfy `V: Deserialize<'_>`
  --> src\idls\collection.rs:14:12
   |
14 | pub struct Collection<K, V>
   |            ^^^^^^^^^^^^^^^^
   |
note: multiple `impl`s or `where` clauses satisfying `V: Deserialize<'_>` found
  --> src\idls\collection.rs:12:21
   |
12 | #[derive(Serialize, Deserialize, Default, Clone)]
   |                     ^^^^^^^^^^^
...
17 |     V: Serialize + DeserializeOwned + GetId<K> + Clone,
   |                    ^^^^^^^^^^^^^^^^
note: required for `Collection<K, V>` to implement `Deserialize<'de>`
  --> src\idls\collection.rs:12:21
   |
12 | #[derive(Serialize, Deserialize, Default, Clone)]
   |                     ^^^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
13 | #[serde(from="Vec<V>", into="Vec<V>")]
14 | pub struct Collection<K, V>
   |            ^^^^^^^^^^^^^^^^
   = note: this error originates in the derive macro `Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info)

我对Rust不够熟悉,无法理解我在这里做错了什么。我通读了 Deserializer lifetimes Serde提供的文档,但我不太理解为什么这些泛型似乎不起作用。我试过交换 DeserializeOwned 具有 for<'a> Deserialize<'a> ,但我不认为这对我的用例是正确的,而且它也不起作用。