Question

我刚刚在我的Realm模型中添加了一个主键，因此我一直在低于错误。我试图在appdelegate中迁移，但仍然得到了恐怖。我所做的就是添加propertyKey()功能。我该如何正确迁移？

Migration is required for object type 'Organization' due to the following errors:
- Property 'id' has been made a primary key."

但是我已经在下面添加了appdelegate：

    Realm.Configuration.defaultConfiguration = Realm.Configuration(
        schemaVersion: 1,
        migrationBlock: { migration, oldSchemaVersion in
            if (oldSchemaVersion < 1) {
                // The enumerate(_:_:) method iterates
                // over every Person object stored in the Realm file
                migration.enumerate(Organization.className()) { oldObject, newObject in
                    // combine name fields into a single field

                }
            }
    })

这是我的对象

class Location: Object {
    var id: Int = 0
    var longitude: Double = 0
    var latitude: Double = 0

    override class func primaryKey() -> String {
        return "id"
    }

}

class Organization: Object {
    var id: Int = 0
    var name: String = ""
    var image: NSData = NSData()
    let locations = List<Location>()

    override class func primaryKey() -> String {
        return "id"
    }
}

Answer 1

如果模型之前没有主键，您可以通过这样做来修复它：

// Changes the coordinate to new values
public void setLocation(int x, int y)
{/*write the code for here*/}

//Shift the point by the translation T<x+h,y+k>
public void translate(int h, int k)
{/*write the code for here*/}

我希望它有所帮助，
干杯！

Answer 2

打开AppDelegate.swift

将以下代码添加到func应用程序中：

let config = Realm.Configuration(

// set a new version number, the version number must bigger than before

    // if you never set it, it's 0

    schemaVersion: 1,

    migrationBlock: { migration, oldSchemaVersion in

    if (oldSchemaVersion < 1) {
      // do nothing
      }
    })

    // tell Realm the new config should be used 

    Realm.Configuration.defaultConfiguration = config

    // open realm file and it will do auto-migration

    let realm = Realm()

Answer 3

更新：在Realm 2.8.3上，迁移不再需要属性primaryKeyProperty。

我无法编辑ReCamilio的答案，抱歉。

迁移Realm中的主键

3 个答案: