feat: only allow voting once

1 files changed, 13 insertions, 0 deletions

diff --git a/models/polls/poll.model.ts b/models/polls/poll.model.ts
index 7f6be9a..ecd8ad8 100644
--- a/models/polls/poll.model.ts
+++ b/models/polls/poll.model.ts
@@ -1,5 +1,18 @@
 import { Model, model } from 'mongoose';
 import { PollSchema, pollSchema } from './poll.schema';
 
+pollSchema.methods.vote = function(userId: string, which: 'left' | 'right'): PollSchema {
+  const participants = ['left', 'right'].reduce((acc, option) => {
+    const { votes } = this.contents[option];
+    return acc.concat(votes);
+  }, []);
+
+  if (!participants.indexOf(userId) === -1) {
+    this.contents[which].votes.push(userId);
+  }
+
+  return this.save();
+}
+
 export default model<PollSchema, Model<PollSchema>>('Poll', pollSchema);