Dedupe nextElected accountIds (#5876)

* Dedupe nextElected accountIds

* remove consoles

packages/api-derive/src/staking/validators.ts

@@ -17,14 +17,16 @@ export function nextElected (instanceId: string, api: DeriveApi): () => Observab
         // only populate for next era in the last session, so track both here - entries are not
         // subscriptions, so we need a trigger - currentIndex acts as that trigger to refresh
         switchMap(({ currentEra }) => api.query.staking.erasStakersPaged.keys(currentEra)),
-        map((keys) => keys.map(({ args: [, accountId] }) => accountId))
+        // Dedupe any duplicates
+        map((keys) => [...new Set(keys.map(({ args: [, accountId] }) => accountId.toString()))].map((a) => api.registry.createType('AccountId', a)))
       )
       : api.query.staking.erasStakers
         ? api.derive.session.indexes().pipe(
           // only populate for next era in the last session, so track both here - entries are not
           // subscriptions, so we need a trigger - currentIndex acts as that trigger to refresh
           switchMap(({ currentEra }) => api.query.staking.erasStakers.keys(currentEra)),
-          map((keys) => keys.map(({ args: [, accountId] }) => accountId))
+          // Dedupe any duplicates
+          map((keys) => [...new Set(keys.map(({ args: [, accountId] }) => accountId.toString()))].map((a) => api.registry.createType('AccountId', a)))
         )
         : api.query.staking['currentElected']<AccountId[]>()
   );