based on city to get the zones

src/controllers/departmentController.js

@@ -684,4 +684,55 @@ exports.addDepartment = async (request, reply) => {
       reply.status(500).send({ message: err.message });
     }
   };
+  
+
+  const getZonesByCitys = async (city) => {
+    try {
+      const result = await City.aggregate([
+        {
+          $unwind: "$city" // Convert location array into separate documents
+        },
+        {
+          $match: {
+            city: { $regex: `^${city}$`, $options: "i" }, // Match city case-insensitively
+          },
+        },
+        {
+          $group: {
+            _id: { 
+              $toUpper: { $trim: { input: "$city" } } // Normalize city name
+            }, 
+            zones: { $addToSet: "$zone" } // Collect unique zones
+          },
+        },
+        {
+          $project: {
+            _id: 0, // Exclude _id
+            city: "$_id", // Return city name
+            zones: 1, // Return collected zones
+          },
+        },
+      ]);
+  
+      return result;
+    } catch (err) {
+      console.error(err);
+      throw new Error("Error fetching zones.");
+    }
+  };
+  
+  exports.getZonesByCity = async (req, reply) => {
+    try {
+      const { city } = req.params;
+  
+      if (!city) {
+        return reply.status(400).send({ message: "City is required." });
+      }
+  
+      const zones = await getZonesByCitys(city);
+      reply.send({ status_code: 200, data: zones });
+    } catch (err) {
+      reply.status(500).send({ message: err.message });
+    }
+  };
   

src/routes/departmentRoute.js

@@ -399,6 +399,21 @@ module.exports = function (fastify, opts, next) {
             handler:departmentController.getLocationsByZone
           });
           
-
+          fastify.route({
+            method: "GET",
+            url: "/api/zonebasedcity/:city",
+            schema: {
+              tags: ["Department"],
+              description: "Get the zones by city",
+              summary: "Get the zones by city",
+              params: {
+                type: "object",
+                properties: {
+                  city: { type: "string" },  
+                },
+              },
+            },
+            handler:departmentController.getZonesByCity
+          });
     next();
     };