我有这个模型:enumPhotoState:String{caseNew="New"caseDownloaded="Downloaded"caseFailed="Failed"}classPhoto:RLMObject{dynamicvarid=0dynamicvarname=""dynamicvarimageURLString=""varstate=PhotoState.NewoverrideclassfuncprimaryKey()->String!{return"id"}overrideclassfuncignoredProperties()->[AnyObject]!{retu