created join group controller

src/controllers/groupController.js

@@ -4,4 +4,54 @@ const groupModel = require("../models/groupModel");
 module.exports.createGroup = async (req, res) => {};
 
 // TODO: implement the join group func wrt to frontend design
-module.exports.joinGroup = async (req, res) => {};
+module.exports.joinGroup = async (req, res) => {
+  const { groupName, groupCode } = req.body;
+
+  try {
+    // Validate input data
+    if (!groupCode || !groupName) {
+      return res.status(400).json({
+        message: "Missing required fields",
+      });
+    }
+    // Find group by name and code
+    const group = await groupModel.findOne({
+      $where: {
+        groupName: groupName,
+        groupCode: groupCode,
+      },
+    });
+
+    if (!group) {
+      return res
+        .status(404)
+        .json({ message: "Group code or group name is invalid" });
+    }
+
+    // Check if user is already part of the group
+    const isMember = group.members.some((member) =>
+      member.user.equals(req.user.id)
+    );
+
+    if (isMember) {
+      return res
+        .status(400)
+        .json({ message: "You are already a part of this group" });
+    }
+
+    // Add the user to the group
+    group.members.push({ user: req.user.id });
+    await group.save();
+
+    // Return a success message
+    return res.status(200).json({
+      message: "You have successfully joined the group",
+    });
+    return;
+  } catch (error) {
+    console.error(error);
+    return res
+      .status(500)
+      .json({ error: "An error occurred while joining the group" });
+  }
+};

src/models/groupModel.js

@@ -1,7 +1,7 @@
 const mongoose = require("mongoose");
 
 const groupSchema = new mongoose.Schema({
-  name: {
+  groupName: {
     type: String,
     required: true,
     trim: true,
@@ -10,6 +10,11 @@ const groupSchema = new mongoose.Schema({
     type: String,
     trim: true,
   },
+  groupCode: {
+    type: String,
+    required: true,
+    unique: true,
+  },
   members: [
     {
       user: {