StorageKey map decoding test (#2009)

packages/types/src/primitive/StorageKey.spec.ts

@@ -235,9 +235,7 @@ describe('StorageKey', (): void => {
   describe('with MetadataV11', (): void => {
     const metadata = new Metadata(registry, rpcDataV11);
 
-    // 0x426e15054d267946093858132eb537f191ca57b0c4b20b29ae7e99d6201d680cc906f7710aa165d62c709012f807af8fc3f0d2abb0c51ca9a88d4ef24d1a092bf89dacf5ce63ea1d
-
-    it('should allow decoding of a key', (): void => {
+    it('should allow decoding of a DoubleMap key', (): void => {
       const key = new StorageKey(registry, '0x5f3e4907f716ac89b6347d15ececedca8bde0a0ea8864605e3b68ed9cb2da01b66ccada06515787c10000000e535263148daaf49be5ddb1579b72e84524fc29e78609e3caf42e85aa118ebfe0b0ad404b5bdd25f');
 
       key.setMeta(metadata.query.staking.erasStakers.meta);
@@ -249,5 +247,17 @@ describe('StorageKey', (): void => {
         '5GNJqTPyNqANBkUVMN1LPPrxXnFouWXoe2wNSmmEoLctxiZY'
       ]);
     });
+
+    it('should allow decoding of a Map key', (): void => {
+      const key = new StorageKey(registry, '0x426e15054d267946093858132eb537f191ca57b0c4b20b29ae7e99d6201d680cc906f7710aa165d62c709012f807af8fc3f0d2abb0c51ca9a88d4ef24d1a092bf89dacf5ce63ea1d');
+
+      key.setMeta(metadata.query.society.defenderVotes.meta);
+
+      expect(
+        key.args.map((arg) => arg.toHuman())
+      ).toEqual([
+        '5D4yQHKfqCQYThhHmTfN1JEDi47uyDJc1xg9eZfAG1R7FC7J'
+      ]);
+    });
   });
 });

packages/types/src/primitive/StorageKey.ts

@@ -122,7 +122,7 @@ function decodeArgsFromMeta (registry: Registry, value: Uint8Array, meta?: Stora
     const mapInfo = meta.type.asMap;
 
     return decodeHashers(registry, value, [
-      [mapInfo.hasher, mapInfo.value.toString()]
+      [mapInfo.hasher, mapInfo.key.toString()]
     ]);
   }
 
@@ -249,7 +249,7 @@ export default class StorageKey extends Bytes {
     try {
       this._args = decodeArgsFromMeta(this.registry, this.toU8a(true), meta || this.meta);
     } catch (error) {
-      // ignore
+      // ignore...
     }
 
     return this;