fixed add and edit expense issue

lib/controller/expense/add_expense_controller.dart

@@ -394,47 +394,86 @@ class AddExpenseController extends GetxController {
     }
   }
 
-  Future<bool> _submitToApi(Map<String, dynamic> payload) async {
-    if (isEditMode.value && editingExpenseId != null) {
-      return ApiService.editExpenseApi(
-        expenseId: editingExpenseId!,
-        payload: payload,
-      );
+  Future<bool> _submitToApi(Map<String, dynamic>? payload) async {
+    if (payload == null) {
+      _errorSnackbar("Payload is empty. Cannot submit.");
+      return false;
+    }
+
+    try {
+      if (isEditMode.value && editingExpenseId != null) {
+        // Edit existing expense
+        return await ApiService.editExpenseApi(
+          expenseId: editingExpenseId!,
+          payload: payload,
+        );
+      } else {
+        // Create new expense
+        return await ApiService.createExpenseApi(
+          projectId: payload['projectId'],
+          expensesTypeId: payload['expenseCategoryId'],
+          paymentModeId: payload['paymentModeId'],
+          paidById: payload['paidById'],
+          transactionDate: DateTime.parse(payload['transactionDate']),
+          transactionId: payload['transactionId'],
+          description: payload['description'],
+          location: payload['location'],
+          supplerName: payload['supplerName'],
+          amount: payload['amount'],
+          noOfPersons: payload['noOfPersons'],
+          billAttachments: payload['billAttachments'],
+        );
+      }
+    } catch (e) {
+      _errorSnackbar("Failed to submit expense: $e");
+      return false;
     }
-    return ApiService.createExpenseApi(
-      projectId: payload['projectId'],
-      expensesTypeId: payload['expensesTypeId'],
-      paymentModeId: payload['paymentModeId'],
-      paidById: payload['paidById'],
-      transactionDate: DateTime.parse(payload['transactionDate']),
-      transactionId: payload['transactionId'],
-      description: payload['description'],
-      location: payload['location'],
-      supplerName: payload['supplerName'],
-      amount: payload['amount'],
-      noOfPersons: payload['noOfPersons'],
-      billAttachments: payload['billAttachments'],
-    );
   }
 
-  Future<Map<String, dynamic>> _buildExpensePayload() async {
+  Future<Map<String, dynamic>?> _buildExpensePayload() async {
     final now = DateTime.now();
 
+    // --- Get IDs safely ---
+    final projectId = projectsMap[selectedProject.value];
+    final expenseType = selectedExpenseType.value;
+    final paymentMode = selectedPaymentMode.value;
+    final paidBy = selectedPaidBy.value;
+
+    // --- Validate essential fields ---
+    if (projectId == null) {
+      _errorSnackbar("Project not selected or invalid");
+      return null;
+    }
+    if (expenseType == null) {
+      _errorSnackbar("Expense type not selected");
+      return null;
+    }
+    if (paymentMode == null) {
+      _errorSnackbar("Payment mode not selected");
+      return null;
+    }
+    if (paidBy == null) {
+      _errorSnackbar("Paid By not selected");
+      return null;
+    }
+
+    // --- Process existing attachments (for edit mode) ---
     final existingPayload = isEditMode.value
         ? existingAttachments
             .map((e) => {
                   "documentId": e['documentId'],
-                  "fileName": e['fileName'],
-                  "contentType": e['contentType'],
+                  "fileName": e['fileName'] ?? "",
+                  "contentType": e['contentType'] ?? "",
                   "fileSize": 0,
                   "description": "",
-                  "url": e['url'],
+                  "url": e['url'] ?? "",
                   "isActive": e['isActive'] ?? true,
                   "base64Data": "",
                 })
             .toList()
         : <Map<String, dynamic>>[];
 
+    // --- Process new attachments ---
     final newPayload = await Future.wait(
       attachments.map((file) async {
         final bytes = await file.readAsBytes();
@@ -449,31 +488,29 @@ class AddExpenseController extends GetxController {
       }),
     );
 
-    final type = selectedExpenseType.value!;
-
-    return {
+    // --- Build final payload ---
+    final payload = {
       if (isEditMode.value && editingExpenseId != null) "id": editingExpenseId,
-      "projectId": projectsMap[selectedProject.value]!,
-      "expenseCategoryId": type.id,
-      "paymentModeId": selectedPaymentMode.value!.id,
-      "paidById": selectedPaidBy.value!.id,
+      "projectId": projectId,
+      "expenseCategoryId": expenseType.id,
+      "paymentModeId": paymentMode.id,
+      "paidById": paidBy.id,
       "transactionDate":
           (selectedTransactionDate.value ?? now).toUtc().toIso8601String(),
-      "transactionId": transactionIdController.text,
-      "description": descriptionController.text,
-      "location": locationController.text,
-      "supplerName": supplierController.text,
-      "amount": double.parse(amountController.text.trim()),
-      "noOfPersons": type.noOfPersonsRequired == true
+      "transactionId": transactionIdController.text.trim(),
+      "description": descriptionController.text.trim(),
+      "location": locationController.text.trim(),
+      "supplerName": supplierController.text.trim(),
+      "amount": double.tryParse(amountController.text.trim()) ?? 0,
+      "noOfPersons": expenseType.noOfPersonsRequired == true
           ? int.tryParse(noOfPersonsController.text.trim()) ?? 0
           : 0,
-      "billAttachments": [
-        ...existingPayload,
-        ...newPayload,
-      ].isEmpty
+      "billAttachments": [...existingPayload, ...newPayload].isEmpty
           ? null
           : [...existingPayload, ...newPayload],
     };
+
+    return payload;
   }
 
   String validateForm() {