Question

我最近对我的项目进行了pod更新，因为我面临Realm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}

我在同一个问题上阅读了其他答案，但没有找到类似的东西。我是Realm的新手，请告诉我解决这个问题的最佳方法。

项目详情：

语言 - 部分中的Swift 3和Objective C
用于数据库的Swift的领域
Xcode版本 - 9.2

Answer 1

您在新版本上安装应用旧版本（降级）

这就是导致此问题的原因，只是尝试迁移您的数据库

 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 haven’t 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

用于iOS的Realm DB会引发架构不匹配错误，前提是架构版本84小于上次设置的版本86

1 个答案: