update poll vote fnc to encode option arrays

packages/dai-plugin-governance/src/GovPollingService.js

@@ -34,11 +34,22 @@ export default class GovPollingService extends PrivateService {
     return this._pollingContract().withdrawPoll(pollId);
   }
 
-  vote(pollIds, optionIds) {
-    if (pollIds.length !== optionIds.length || pollIds.length === 0)
+  vote(pollIds, options) {
+    if (pollIds.length !== options.length || pollIds.length === 0)
       throw new Error(
         'poll id array and option id array must be the same length and have a non-zero number of elements'
       );
+
+    const optionIds = options.map(option => {
+      if (!Array.isArray(option)) return option;
+      if (option.length === 1) return option[0];
+      const byteArray = new Uint8Array(32);
+      option.forEach((optionIndex, i) => {
+        byteArray[byteArray.length - i - 1] = optionIndex;
+      });
+      return fromBuffer(byteArray).toString();
+    });
+
     if (pollIds.length === 1) {
       const func = 'vote(uint256,uint256)';
       return this._batchPollingContract()[func](pollIds[0], optionIds[0]);

packages/dai-plugin-governance/test/GovPollingService.test.js

@@ -95,6 +95,19 @@ test('can vote in batches', async () => {
   expect(loggedOptionIds[1]).toBe(OPTION_IDS[1]);
 });
 
+test('can vote in batches with array options (ranked choice)', async () => {
+  const POLL_IDS = [0, 1];
+  const OPTION_IDS = [3, [1, 4]];
+  const txo = await govPollingService.vote(POLL_IDS, OPTION_IDS);
+  const loggedOptionIds = [
+    parseInt(txo.receipt.logs[0].topics[3]),
+    parseInt(txo.receipt.logs[1].topics[3])
+  ];
+  // this will fail if the event was not emitted
+  expect(loggedOptionIds[0]).toBe(OPTION_IDS[0]);
+  expect(loggedOptionIds[1]).toBe(1025);
+});
+
 test('can withdraw poll', async () => {
   const POLL_ID = 0;
   const txo = await govPollingService.withdrawPoll(POLL_ID);