ios - Realm swift change primaryKey -

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so have realm object

class registrationplatedb: rlmobject {      dynamic var registrationplate : string = ""     dynamic var user : string = ""      override static func primarykey() -> string? {         return "registrationplate"     } ...

and change 

class registrationplatedb: object {      dynamic var plateid : int = -1     dynamic var registrationplate : string = ""     dynamic var name : string = ""     dynamic var user : string = ""       override static func primarykey() -> string? {         return "plateid"     } ....

so i've written migration 

 migration.enumerate(registrationplatedb.classname()) { oldobject, newobject in          newobject!["name"] = ""         newobject!["user"] = ""         newobject!["registrationplate"] = ""         newobject!["plateid"] = -1         newobject!["primarykeyproperty"] = "plateid";    }

but error because of primarykey change, since if leave line out works primary key doesn't change.

can give me idea how change primarykey.

edit: first object written objective-c realm

edit2: or if know how make plateid autoincrement

katsumi realm here. don't need attempt change primary key in migration block.

we automatically update schema latest version, , thing have handle in migration block adjusting data fit (e.g. if rename property have copy data old property new 1 in migration block).

so newobject!["primarykeyproperty"] = "plateid"; not needed.

i think migration block should following:

migration.enumerate(registrationplatedb.classname()) { oldobject, newobject in     newobject!["user"] = oldobject!["user"]     newobject!["registrationplate"] = oldobject!["registrationplate"]     newobject!["plateid"] = int(oldobject!["registrationplate"] as! string) }

if you'd assign sequence numbers plateid, example:

var plateid = 0 migration.enumerate(registrationplatedb.classname()) { oldobject, newobject in     newobject!["user"] = oldobject!["user"]     newobject!["plateid"] = plateid     plateid += 1 }

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