CODEWITHSUNDEEP
substratepolkadot
Amiya Behera
Amiya Behera

Reputation: 2270

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

Here is my struct:

#[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>,
}

My storage:

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

But its giving error:

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

Upvotes: 3

Views: 294

Answers (1)

bkchr
bkchr

Reputation: 641

You need to use this:

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

Make sure to use T::AccountId in SortitionSumTree<T::AccountId>.

Upvotes: 7

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