我想将我的域架构迁移到新版本.因此需要删除我的主键.
旧架构：
class StudyState : Object
{
dynamic var name = ""
dynamic var x = ""
dynamic var y = ""
override static func primaryKey() -> String? {
return "name"
}
}
新架构：
class StudyState : Object
{
dynamic var name = ""
dynamic var x = ""
dynamic var y = ""
}
没有迁移,领域将失败
‘RLMException’,reason: ‘Migration is required for object type ‘StudyState’ due to the following errors:
– Property ‘name’ is no longer a primary key.’
我尝试了这个迁移块,它也失败了：
migration.enumerate(StudyState.className()) { oldObject,newObject in
newObject?["deleted"] = false
newObject?["primaryKeyProperty"] = ""
}
‘RLMException’,reason: ‘Invalid property name’
在将域迁移到新的架构版本时,有没有办法删除主键？
解决方法
如果仅删除主键注释,则无需在迁移块中执行任何操作.
但是由于模式定义发生了变化,因此需要增加模式版本.
但是由于模式定义发生了变化,因此需要增加模式版本.
如下所示：
// You have to migrate Realm BEFORE open Realm if you changed schema definitions
setSchemaVersion(1,Realm.defaultPath) { (migration,oldSchemaVersion) -> Void in
if oldSchemaVersion < 1 {
// Nothing to do!
// Realm will automatically detect new properties and removed properties
// And will update the schema on disk automatically
}
}
let realm = Realm()
...
