feat: only allow voting once

2 files changed, 14 insertions, 1 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);
 
diff --git a/models/polls/poll.schema.ts b/models/polls/poll.schema.ts
index 0caa6b2..380c069 100644
--- a/models/polls/poll.schema.ts
+++ b/models/polls/poll.schema.ts
@@ -11,7 +11,7 @@ export interface PollSchema extends Document {
     right: ImageDataSchema;
   };
   authorId: string;
-  vote: (userId: string, which: 'left' | 'right') => void;
+  vote: (userId: string, which: 'left' | 'right') => PollSchema;
 }
 
 export const imageDataSchema = {