Update customer management functionality by adding modification support, enhancing the customer model to include modifications, and improving the UI for customer and modification forms. Refactor API routes for better error handling and streamline customer data management.

models/Customer.js

@@ -20,6 +20,7 @@ const customerSchema = new mongoose.Schema({
   },
   address: {
     type: String,
+    required: true,
     trim: true
   },
   carModel: {
@@ -28,10 +29,31 @@ const customerSchema = new mongoose.Schema({
     trim: true
   },
   carYear: {
-    type: String,
-    required: true,
-    trim: true
+    type: Number,
+    required: true
   },
+  modifications: [{
+    name: {
+      type: String,
+      required: true
+    },
+    description: {
+      type: String,
+      required: true
+    },
+    price: {
+      type: Number,
+      required: true
+    },
+    category: {
+      type: String,
+      required: true
+    },
+    dateAdded: {
+      type: Date,
+      default: Date.now
+    }
+  }],
   createdAt: {
     type: Date,
     default: Date.now
@@ -48,4 +70,6 @@ customerSchema.pre('save', function(next) {
   next();
 });
 
-module.exports = mongoose.model('Customer', customerSchema); 
+const Customer = mongoose.model('Customer', customerSchema);
+
+module.exports = Customer;