diff --git a/dimensionhub/Core/UserModel.swift b/dimensionhub/Core/UserModel.swift
index 0e26ccb..45a7d76 100644
--- a/dimensionhub/Core/UserModel.swift
+++ b/dimensionhub/Core/UserModel.swift
@@ -7,15 +7,29 @@
 
 import Foundation
 import SwiftData
+import UIKit
 
 @Model
 final class UserModel {
-    var userId: Int
+    var userId: String
     var username: String
     
-    init(userId: Int, username: String) {
+    init(userId: String, username: String) {
         self.userId = userId
         self.username = username
     }
     
+    static func defaultUser() -> UserModel {
+        return UserModel(userId: getUserId(), username: "")
+    }
+    
+    // 获取设备的唯一标识
+    private static func getUserId() -> String {
+        if let uuid = UIDevice.current.identifierForVendor?.uuidString {
+            return uuid.lowercased()
+        } else {
+            return UUID().uuidString.lowercased()
+        }
+    }
+    
 }
diff --git a/dimensionhub/Views/IndexView.swift b/dimensionhub/Views/IndexView.swift
index 761b542..013be18 100644
--- a/dimensionhub/Views/IndexView.swift
+++ b/dimensionhub/Views/IndexView.swift
@@ -110,7 +110,7 @@ final class IndexModel {
 
 struct IndexView: View {
     @Environment(\.modelContext) private var modelContext
-    @Query private var items: [Item]
+    //@Query private var items: [Item]
     @Query private var userModel: [UserModel]
     
     @State var indexModel = IndexModel()
@@ -229,22 +229,23 @@ struct IndexView: View {
         .ignoresSafeArea(edges: .bottom)
         .task {
             //await self.indexModel.loadData()
+            print(userModel)
         }
     }
 
     private func addItem() {
-        withAnimation {
-            let newItem = Item(timestamp: Date())
-            modelContext.insert(newItem)
-        }
+//        withAnimation {
+//            let newItem = Item(timestamp: Date())
+//            modelContext.insert(newItem)
+//        }
     }
 
     private func deleteItems(offsets: IndexSet) {
-        withAnimation {
-            for index in offsets {
-                modelContext.delete(items[index])
-            }
-        }
+//        withAnimation {
+//            for index in offsets {
+//                modelContext.delete(items[index])
+//            }
+//        }
     }
     
 }
diff --git a/dimensionhub/dimensionhubApp.swift b/dimensionhub/dimensionhubApp.swift
index 1bab17f..32c60b9 100644
--- a/dimensionhub/dimensionhubApp.swift
+++ b/dimensionhub/dimensionhubApp.swift
@@ -15,10 +15,24 @@ struct dimensionhubApp: App {
             Item.self,
             UserModel.self
         ])
-        let modelConfiguration = ModelConfiguration(schema: schema, isStoredInMemoryOnly: false)
-
+        let modelConfiguration = ModelConfiguration(
+            schema: schema,
+            isStoredInMemoryOnly: false,
+            allowsSave: true
+        )
+        
         do {
-            return try ModelContainer(for: schema, configurations: [modelConfiguration])
+            let container = try ModelContainer(for: schema, configurations: [modelConfiguration])
+            
+            // 如何用户不存在，则初始化一个用户
+            var descriptor = FetchDescriptor<UserModel>(sortBy: [])
+            descriptor.fetchLimit = 1
+            let users = try container.mainContext.fetch(descriptor)
+            if users.isEmpty {
+                container.mainContext.insert(UserModel.defaultUser())
+            }
+            
+            return container
         } catch {
             fatalError("Could not create ModelContainer: \(error)")
         }