diff --git a/dimensionhub/Views/DateNavView.swift b/dimensionhub/Views/DateNavView.swift
index 6e2bb7b..2d7e25a 100644
--- a/dimensionhub/Views/DateNavView.swift
+++ b/dimensionhub/Views/DateNavView.swift
@@ -17,7 +17,7 @@ struct DateNavView: View {
     
     var body: some View {
         VStack(alignment: .center) {
-            ForEach(navModel.dateModels, id: \.year) { model in
+            ForEach(navModel.dateModels) { model in
                 VStack(alignment: .leading, spacing: 10) {
                     Text(model.year)
                     HStack {
@@ -35,6 +35,9 @@ struct DateNavView: View {
         .task {
             await self.navModel.loadDateCells()
         }
+        .onAppear {
+            print("group_id is: \(selectGroupId)")
+        }
     }
     
 }
@@ -90,15 +93,21 @@ extension DateNavView {
 @Observable
 final class DateNavModel {
     
-    struct DateModel: Codable {
+    struct DateModel: Codable, Identifiable {
         struct Month: Codable {
             let id: String
             let name: String
             let disabled: Bool
         }
         
+        let id = UUID().uuidString
         let year: String
         let months: [Month]
+        
+        enum CodingKeys: String, CodingKey {
+            case year
+            case months
+        }
     }
     
     var dateModels: [DateModel]
diff --git a/dimensionhub/Views/IndexView.swift b/dimensionhub/Views/IndexView.swift
index 7956df8..746ff94 100644
--- a/dimensionhub/Views/IndexView.swift
+++ b/dimensionhub/Views/IndexView.swift
@@ -154,8 +154,9 @@ struct IndexView: View {
                         case .group(let group):
                             Text(group.groupName)
                                 .onTapGesture {
-                                    showDateNavPopover = true
                                     selectGroupId = group.groupId
+                                    print("current group_id: \(self.selectGroupId)")
+                                    showDateNavPopover = true
                                 }
                         case .item(let item):
                             VStack(alignment: .center) {