我有一个建模的Realm Object
class WorkoutSet: Object {
// Schema 0
dynamic var exerciseName: String = ""
dynamic var reps: Int = 0
// Schema 0 + 1
dynamic var setCount: Int = 0
}
我正在尝试执行迁移。
我内心AppDelegate
已经导入RealmSwift
。
在didFinishLaunchWithOptions
我调用的函数中
Migrations().checkSchema()
迁移是在另一个文件中声明的类。
在该文件中,有一个声明为这样的结构。
func checkSchema() {
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: 1,
// 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
switch oldSchemaVersion {
case 1:
break
default:
// Nothing to do!
// Realm will automatically detect new properties and removed properties
// And will update the schema on disk automatically
self.zeroToOne(migration)
}
})
}
func zeroToOne(migration: Migration) {
migration.enumerate(WorkoutSet.className()) {
oldObject, newObject in
let setCount = 1
newObject!["setCount"] = setCount
}
}
添加setCount
模型时出现错误
您将需要调用迁移。仅创建配置,将不会调用它。有两种方法可以做到这一点:
通过迁移将您的配置设置为Realm的默认配置-
let 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: 1,
// 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
if oldSchemaVersion < 1 {
migration.enumerate(WorkoutSet.className()) { oldObject, newObject in
newObject?["setCount"] = setCount
}
}
}
)
Realm.Configuration.defaultConfiguration = config
要么
migrateRealm(配置)
现在,您的迁移应该可以正常工作了。
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