我是快速和领域的新手。我想制作一个复合主键,当我尝试这样的事情时:
class DbLocation : Object {
dynamic var id = 0
dynamic var tourId = 0
dynamic var uuid : String {
return "\(id)\(tourId)"
}
override static func primaryKey() -> String? {
return "uuid"
}
}
我收到此错误:'对象'DbLocation'上不存在主键属性'uuid'
任何人都可以帮我解决如何创建复合主键的示例?
这应该给你答案:
class DbLocation: Object {
dynamic var id = 0
dynamic var tourId = 0
func setCompoundID(id: Int) {
self.id = id
compoundKey = compoundKeyValue()
}
func setCompoundTourId(tourId: Int) {
self.tourId = tourId
compoundKey = compoundKeyValue()
}
dynamic lazy var compoundKey: String = self.compoundKeyValue()
override static func primaryKey() -> String? {
return "compoundKey"
}
func compoundKeyValue() -> String {
return "\(id)\(tourId)"
}
}
自定义setter确保复合键始终更新,懒惰关键字确保您第一次访问它时,它将从您已设置的内容中派生出来。
有关此主题的更多信息,请参阅this thread,此问题一直存在争议。
简单地创建一个新属性,其值设置为您希望为复合主键的其他属性。
class DbLocation: Object {
dynamic var id = 0
dynamic var tourId = 0
dynamic var compoundKey: String? = ""
override static func primaryKey() -> String? {
return "compoundKey"
}
}
let location = DbLocation()
location.tourId = 1
location.id = 5
location.compoundKey = "\(id) \(tourId)"
对于Swift和Realm的最新版本,我会做这样的事情。
dynamic private var compoundKey: String = ""
required convenience init?(map: Map) {
self.init()
if let firstValue = map.JSON["firstValue"] as? String,
let secondValue = map.JSON["secondValue"] as? Int {
compoundKey = firstValue + "|someStringToDistinguish|" + "\(secondValue)"
}
}
你需要从你的对象中返回一个属性
这是示例代码
class FoodModel:Object
{
dynamic var name = ""
dynamic var _id = ""
override static func primaryKey() -> String? {
return "_id"
}
}
请注意,_id在模型中是var