特性 `parity_scale_codec::Encode` 没有为 `std::collections::BTreeMap<u128, T>` 实现

Question

这是我的结构：

#[derive(PartialEq, Eq, PartialOrd, Ord, Default, Clone, Encode, Decode, TypeInfo)]
#[cfg_attr(feature = "std", derive(Debug))]
pub struct SortitionSumTree<AccountId> {
    pub k: u128,
    pub stack: Vec<u128>,
    pub nodes: Vec<u128>,
    pub ids_to_tree_indexes: BTreeMap<AccountId, u128>,
    pub node_indexes_to_ids: BTreeMap<u128, AccountId>,
}

我的存储空间：

#[pallet::storage]
#[pallet::getter(fn sortition_sum_trees)]
pub type SortitionSumTrees<T> = StorageMap<_, Blake2_128Concat, Vec<u8>, SortitionSumTree<T>>;

但是给出错误：

特性 parity_scale_codec::Encode 没有为 std::collections::BTreeMap<u128, T>

实现

Answer 1

你需要使用这个：

#[pallet::getter(fn sortition_sum_trees)]
pub type SortitionSumTrees<T> = StorageMap<
  _, 
  Blake2_128Concat,
  Vec<u8>,
  SortitionSumTree<T::AccountId>
>;

确保在 SortitionSumTree<T::AccountId>.

中使用 T::AccountId

特性 `parity_scale_codec::Encode` 没有为 `std::collections::BTreeMap<u128, T>` 实现

the trait `parity_scale_codec::Encode` is not implemented for `std::collections::BTreeMap<u128, T>`

substrate

polkadot