remove the duplicates in department Name

src/controllers/departmentController.js

@@ -1128,31 +1128,32 @@ const getDepartmentsByName = async (officeName, city, departmentName) => {
         .select("departmentName -_id")
         .lean();
   
-      return result.map(doc => doc.departmentName);
+      // Remove duplicate department names
+      return [...new Set(result.map(doc => doc.departmentName))];
     } catch (error) {
       console.error("Error fetching departments by city:", error);
       throw new Error("Error fetching departments by city.");
     }
   };
   
+  // API route handler
+  exports.getDepartmentsByCity = async (req, reply) => {
+    try {
+      const { city } = req.params;
+      if (!city || city.trim() === "") {
+        return reply.status(400).send({ message: "City is required." });
+      }
   
-// API route handler
-exports.getDepartmentsByCity = async (req, reply) => {
-  try {
-    const { city } = req.params;
-    if (!city || city.trim() === "") {
-      return reply.status(400).send({ message: "City is required." });
-    }
+      const departmentNames = await getDepartmentNamesByCity(city);
   
-    const departmentNames = await getDepartmentNamesByCity(city);
+      if (departmentNames.length === 0) {
+        return reply.status(404).send({ message: "No departments found for the specified city." });
+      }
   
-    if (departmentNames.length === 0) {
-      return reply.status(404).send({ message: "No departments found for the specified city." });
+      reply.send({ status_code: 200, data: departmentNames });
+    } catch (error) {
+      console.error("API Error:", error);
+      reply.status(500).send({ message: error.message });
     }
+  };
   
-    reply.send({ status_code: 200, data: departmentNames });
-  } catch (error) {
-    console.error("API Error:", error);
-    reply.status(500).send({ message: error.message });
-  }
-};