Added vote route in backend

backend/src/controllers/poll.controller.js

@@ -1,5 +1,6 @@
 import {
   createPollService,
+  createVoteService,
   deletePollService,
   getAllCreatedPollsService,
   getPollDataService,
@@ -105,3 +106,34 @@ export async function deletePollController(req, res) {
     }
   }
 }
+
+
+export const createVoteController = async (req, res) => {
+  try {
+    const reqPollId = req.body.pollId;
+    const reqOptionId = req.body.optionId;
+    const reqUserId = req.user._id;
+
+    const vote = await createVoteService(reqPollId, reqUserId, reqOptionId);
+  
+    res.json({
+      success : true,
+      message : "Vote created successfully.",
+      data : vote
+    })  
+  } 
+  catch (err) {
+    console.log(err);
+    if (err.statusCode) {
+      res.status(err.statusCode).json({
+        success: false,
+        message: err.message,
+      });
+    } else {
+      res.status(500).json({
+        success: false,
+        message: err.message,
+      });
+    }
+  }
+}

backend/src/models/vote.model.js

@@ -0,0 +1,23 @@
+import mongoose, { Schema } from "mongoose";
+
+const voteSchema = new Schema({
+    pollId : {
+        type : Schema.Types.ObjectId,
+        ref : "Poll",
+        required : true
+    },
+    userId : {
+        type : Schema.Types.ObjectId,
+        ref : "User",
+        required : true
+    },
+    optionId : {
+        type : Schema.Types.ObjectId,
+        ref : "Option",
+        required : true
+    },
+}, {timestamps : true});
+
+
+const VoteModel = mongoose.model("Vote", voteSchema);
+export default VoteModel;

backend/src/repositories/poll.repo.js

@@ -1,4 +1,6 @@
 import PollModel from "../models/poll.model.js";
+import mongoose from "mongoose";
+const {ObjectId} = mongoose.Types;
 
 export async function createPollByData(data) {
     try {
@@ -39,3 +41,20 @@ export async function deletePollById(id) {
         throw err;
     }
 }
+
+export async function updatePollVoteCount(pollId, optionId) {
+    try {
+        const pollIdObejct = new ObjectId(pollId);
+        const optionIdObject  = new ObjectId(optionId);
+        console.log(pollId, optionId, pollIdObejct, optionIdObject);
+        const result = await PollModel.updateOne(
+            { _id: pollIdObejct, "options._id": optionIdObject },
+            { $inc: { "options.$.voteCount": 1 } }
+          );
+
+        return result;
+    }
+    catch(err){
+        throw err;
+    }
+}

backend/src/repositories/vote.repo.js

@@ -0,0 +1,27 @@
+import VoteModel from "../models/vote.model.js";
+
+export async function findVoteByPollIdAndUserId(pollId, userId) {
+    try {
+        const vote  = VoteModel.findOne({pollId : pollId, userId : userId});
+        return vote;
+    }
+    catch(err){
+        throw err;
+    }
+}
+
+
+export async function createVote(pollId, userId, optionId) {
+    try{
+        const vote = VoteModel.create({
+            pollId,
+            userId,
+            optionId
+        });
+
+        return vote;
+    }
+    catch(err){
+        throw err;
+    }
+}

backend/src/routes/v1/poll.route.js

@@ -1,8 +1,9 @@
 import express from "express";
 import { verifyToken } from "../../middlwares/verifyToken.js";
-import { createPollController, deletePollController, getAllCreatedPollsController, getPollDataController } from "../../controllers/poll.controller.js";
+import { createPollController, createVoteController, deletePollController, getAllCreatedPollsController, getPollDataController } from "../../controllers/poll.controller.js";
 import pollDataSchema from "../../validations/pollDataValidation.js";
 import validator from "../../validations/validator.js";
+import voteSchema from "../../validations/voteValidation.js";
 const pollRouter = express.Router();
 
 /**
@@ -122,4 +123,6 @@ pollRouter.get("/created", verifyToken, getAllCreatedPollsController);
  * */
 pollRouter.delete("/delete/:pollId", verifyToken, deletePollController);
 
+pollRouter.post("/vote", validator(voteSchema), verifyToken, createVoteController);
+
 export default pollRouter;

backend/src/services/poll.service.js

@@ -1,11 +1,13 @@
 import mongoose from "mongoose";
-import { createPollByData, deletePollById, findPollById, findPollsByCreatorId } from "../repositories/poll.repo.js";
+import { createPollByData, deletePollById, findPollById, findPollsByCreatorId, updatePollVoteCount } from "../repositories/poll.repo.js";
+import { createVote, findVoteByPollIdAndUserId } from "../repositories/vote.repo.js";
 
 export async function createPollService(title, description, options, userId) {
     try {
         const optionsData = options.map(option => ({
             name: option,
-            _id : new mongoose.Types.ObjectId()
+            _id : new mongoose.Types.ObjectId(),
+            voteCount : 0
         }));
 
         const data = {
@@ -75,3 +77,32 @@ export async function deletePollService(pollId, user) {
         throw err;
     }
 }
+
+export async function createVoteService(pollId, userId, optionId) {
+    try {
+        // vote already voted
+        const vote = await findVoteByPollIdAndUserId(pollId, userId);
+        if (vote) {
+            throw {
+                statusCode: 400,
+                message: "You have already voted on this poll"
+            }
+        }
+        console.log(pollId, userId, optionId);
+        const poll = await findPollById(pollId);
+        if (!poll) {
+            throw {
+                statusCode: 404,
+                message: "Poll not found"
+            }
+        }
+        const updatedPollData = await updatePollVoteCount(pollId, optionId);
+        const createdVote = await createVote(pollId, userId, optionId);
+        console.log(updatedPollData)
+        return createVote;
+        
+    }
+    catch(err){
+        throw err;
+    }
+}

backend/src/validations/voteValidation.js

@@ -0,0 +1,14 @@
+import { z } from "zod";
+
+const voteSchema = z.object({
+  pollId: z.string({
+    required_error: "Poll Id is required.",
+    invalid_type_error: "Poll Id should be a string.",
+  }),
+  optionId: z.string({
+    required_error: "Option Id is required.",
+    invalid_type_error: "Option Id should be a string.",
+  }),
+});
+
+export default voteSchema;

frontend/src/pages/VotingPage.jsx

@@ -5,6 +5,7 @@ import { Chart as ChartJS, BarElement, CategoryScale, LinearScale } from "chart.
 import { useQuery } from "react-query";
 import { useParams } from "react-router-dom";
 import getPollData from "../services/getPollData";
+import ErrorFallback from "../components/Errors/ErrorFallback";
 
 ChartJS.register(BarElement, CategoryScale, LinearScale);
 
@@ -12,62 +13,57 @@ function VotingPage() {
 
   const { pollId } = useParams();
 
-  const { data: poll, isLoading, isError } = useQuery(["poll", pollId], () => getPollData(pollId), {
+  const { data: poll, isLoading, isError, refetch } = useQuery(["poll", pollId], () => getPollData(pollId), {
     cacheTime : 10*100*60, // 10 minutes
     staleTime : 20*100*60, // 20 minutes
   });
-  console.log(poll);
-  
-  const pollData = {
-    title: "What's your favorite programming language?",
-    options: [
-      { id: 1, label: "JavaScript", votes: 20 },
-      { id: 2, label: "Python", votes: 35 },
-      { id: 3, label: "Java", votes: 25 },
-      { id: 4, label: "C++", votes: 15 },
-    ],
-    creator: {
-      name: "John Doe",
-      image: "https://via.placeholder.com/100",
-    },
-  };
 
   // Dummy chart data for visualization
   const chartData = {
-    labels: pollData.options.map(option => option.label),
+    labels: poll?.data?.pollData?.options.map(option => option.name),
     datasets: [
       {
         label: "Votes",
-        data: pollData.options.map(option => option.votes),
+        data: poll?.data?.pollData?.options.map(option => option.voteCount),
         backgroundColor: ["#3B82F6", "#EF4444", "#10B981", "#F59E0B"],
         borderWidth: 1,
       },
     ],
   };
 
+  if (isLoading) {
+    return <div className="skeleton h-64 w-full max-w-lg mt-12 mx-auto"></div>;
+  }
+
+  if (isError){
+    return <div className="h-64 w-full max-w-lg mt-12 mx-auto">
+      <ErrorFallback onRetry={refetch}/>
+    </div>
+  }
+
   return (
     <div className="bg-base-200 min-h-screen p-6 text-white flex flex-col items-center">
       {/* Poll Creator Info */}
       <div className="flex items-center justify-center gap-4 mb-6">
         <img
-          src={pollData.creator.image}
-          alt={pollData.creator.name}
+          src="https://via.placeholder.com/100"
+          alt={poll?.data?.creatorData?.username}
           className="rounded-full h-7 md:h-10 w-7 md:w-10"
         />
-        <h2 className="text-lg md:text-xl font-semibold">{pollData.creator.name}</h2>
+        <h2 className="text-lg md:text-xl font-semibold">{poll?.data?.creatorData?.username || "Unknown"}</h2>
       </div>
 
       {/* Poll Title */}
-      <h1 className="text-xl md:text-3xl font-bold mb-4 text-center">{pollData.title}</h1>
+      <h1 className="text-xl md:text-3xl font-bold mb-4 text-center">{poll?.data?.pollData?.title || "Loading.."}</h1>
 
       {/* Voting Options */}
       <div className="grid grid-cols-1 md:grid-cols-2 gap-4 w-full max-w-lg mb-6">
-        {pollData.options.map(option => (
+        {poll?.data?.pollData?.options.map(option => (
           <div
-            key={option.id}
+            key={option._id}
             className="md:p-4 p-2 bg-base-100 rounded-lg shadow-md flex items-center justify-center cursor-pointer hover:bg-base-300 transition"
           >
-            <span className="text-lg">{option.label}</span>
+            <span className="text-lg">{option.name}</span>
           </div>
         ))}
       </div>