get all department names

src/controllers/departmentController.js

@@ -766,3 +766,48 @@ exports.addDepartment = async (request, reply) => {
     }
   };
   
+
+  const getDepartmentNames = async () => {
+    try {
+      const result = await Deparments.aggregate([
+        {
+          $group: {
+            _id: {
+              $toUpper: { $trim: { input: "$departmentName" } }, // Convert to uppercase & trim spaces
+            },
+          },
+        },
+        {
+          $sort: { _id: 1 } // Sort alphabetically
+        },
+        {
+          $group: {
+            _id: null,
+            departmentNames: { $addToSet: "$_id" } // Collect unique values in an array
+          }
+        },
+        {
+          $project: {
+            _id: 0,
+            departmentNames: 1 // Return only the array
+          },
+        }
+      ]);
+  
+      return result.length > 0 ? result[0].departmentNames : []; // Return an empty array if no data
+    } catch (err) {
+      console.error(err);
+      throw new Error("Error fetching department names.");
+    }
+  };
+  
+  // API Route
+  exports.getAllDepartmentNames = async (req, reply) => {
+    try {
+      const departments = await getDepartmentNames();
+      reply.send({ status_code: 200, data: departments });
+    } catch (err) {
+      reply.status(500).send({ message: err.message });
+    }
+  };
+  

src/routes/departmentRoute.js

@@ -432,5 +432,23 @@ module.exports = function (fastify, opts, next) {
             },
             handler:departmentController.getDepartments
           });
+
+
+            fastify.get("/api/getalldepartmentNames", {
+              schema: {
+                tags: ["Department"],
+                description: "This is for Get all departmentNames Data",
+                summary: "This is for to Get all departmentNames Data",
+              
+                security: [
+                  {
+                    basicAuth: [],
+                  },
+                ],
+              },
+              //preHandler: fastify.auth([fastify.authenticate]),
+              handler: departmentController.getAllDepartmentNames,
+            });
+            
     next();
     };