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如果架构版本84小于上次设置的版本86,则Realm DB for iOS引发架构不匹配错误

realm-migration realm swift ios

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SeaWarrior404 · 技术社区 · 7 年前

我最近对我的项目做了一次pod更新,从那以后我就面临着领域的问题。代码如下:,

    MyNetworkManager.sharedNetworkManager.performNetworkOperation(url: MyEndpoint().homepage(), httpmethod: .get, parameters: requestDict) { response in
        let realm = try! Realm()
        try! realm.write {
            let JSON = response.result.value as AnyObject
            realm.create(HomePageData.self, value: JSON, update: true)
        }

显示的错误如下:,

    Thread 1: Fatal error: 'try!' expression unexpectedly raised an error: 
    Error Domain=io.realm Code=1 "Provided schema version 84 is less than last set 
    version 86." UserInfo={NSLocalizedDescription=Provided schema version 84 is 
    less than last set version 86., Error Code=1}

我阅读了关于同一问题的其他答案,但没有找到任何类似的答案。一般来说,我是新手,请告诉我解决这个问题的最佳方法是什么。

项目详细信息:

语言-Swift 3和目标C部分
用于DB的Swift领域
Xcode版本-9.2

1 回复 | 直到 7 年前

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2

a.masri 7 年前

您正在新版本上安装应用程序旧版本(降级)

这就是导致此问题的原因,请尝试迁移数据库

 var config = Realm.Configuration(
                // Set the new schema version. This must be greater than the previously used
                // version (if you've never set a schema version before, the version is 0).
                schemaVersion: 87,

                // Set the block which will be called automatically when opening a Realm with
                // a schema version lower than the one set above
                migrationBlock: { migration, oldSchemaVersion in
                    // We havenât migrated anything yet, so oldSchemaVersion == 0
                    if (oldSchemaVersion < 86) {
                        // Nothing to do!
                        // Realm will automatically detect new properties and removed properties
                        // And will update the schema on disk automatically
                    }
            })

            // Tell Realm to use this new configuration object for the default Realm
            Realm.Configuration.defaultConfiguration = config