获取对象时 CoreStore Xcode 数据错误问题

Question

我是 CoreStore 的新手，正在尝试测试我正确创建、存储和获取 CoreStore 对象的能力。条目似乎是根据 dataStack.fetchCount() 和 transaction.create() 的结果创建的，但是根据我的 dataStack.fetchAll() 结果，数据不可用或存储不正确（它说data: fault 在每个对象的末尾）和使用 Liya 软件检查 SQLite 数据库发现 table 中没有条目。我使用的是 CoreStore v8.0.1 和 Xcode v12.4。我的示例代码（使用同步执行）如下。感谢您对解决问题的投入。谢谢

MyImage.swift:

import CoreStore
final class MyImage: CoreStoreObject {
    @Field.Stored("desc")
    var desc: String = ""
}

MyApp.swift

import SwiftUI
import CoreStore
import Foundation

@main
struct MyApp: App {
    
    static let dataStack: DataStack = {
        let dataStack = DataStack(
            CoreStoreSchema(
                modelVersion: "V1",
                entities: [
                    Entity<MyImage>("MyImage")
                ],
                versionLock: [
                    "MyImage": [..., ..., ..., ...]
                ]
            )
        )
        
        try! dataStack.addStorageAndWait(
            SQLiteStore( fileName: "MyStore.sqlite",
                //localStorageOptions: .allowSynchronousLightweightMigration,
                localStorageOptions: .recreateStoreOnModelMismatch
            )
        )
        print(dataStack.coreStoreDumpString)
        return dataStack
    }()
    
    init() {
        CoreStoreDefaults.dataStack = MyApp.dataStack
        try! dataStack.perform(
            synchronous: { (transaction) in
                let test_obj = transaction.create(Into<MyImage>())
                test_obj.desc = "Description"
            },
            waitForAllObservers: true
        )
        
        do {
            let objects = try dataStack.fetchAll(From<MyImage>())
            print(objects)
        } catch { print("error fetching")}
    }
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

感谢您的帮助。

Answer 1

原来在访问对象的属性之前，fetch结果会显示data:fault。以下示例代码将显示属性的值：

let objects = try dataStack.fetchAll(From<MyImage>())
print(objects.map { [=10=].desc })

获取对象时 CoreStore Xcode 数据错误问题

CoreStore Xcode data fault issue when fetching objects

corestore