我在领域中链接对象时遇到问题。我阅读了题为“境界中的嵌套对象”的问题和答案，并尝试了建议的答案，但它对我不起作用。
以下是我的对象类：
import Foundation
import RealmSwift
class Job: Object {
dynamic var id = NSUUID().UUIDString
dynamic var name = ""
dynamic var address = ""
dynamic var phone = ""
dynamic var email = ""
dynamic var notes = ""
dynamic var material = 0.0
dynamic var edge = 0.0
dynamic var splash = 0.0
dynamic var discount = 0.0
dynamic var trip = 0.0
let rooms = List<Room>()
override static func primaryKey() -> String {
return "id"
}
}
import Foundation
import RealmSwift
class Room: Object {
dynamic var id = NSUUID().UUIDString
dynamic var name = ""
dynamic var material = 0.0
dynamic var edge = 0.0
dynamic var splash = 0.0
dynamic var sinkType = ""
dynamic var sinkModel = ""
dynamic var numberOfSinks = 0
dynamic var faucet = ""
dynamic var rangeType = ""
dynamic var notes = ""
dynamic var jobs: Job?
let countertops = List<Countertop>()
//var linksToJob: [Job] {
// return linkingObjects(Job.self, forProperty: "rooms")
//}
override static func primaryKey() -> String {
return "id"
}
}
import Foundation
import RealmSwift
class Countertop: Object {
dynamic var id = NSUUID().UUIDString
dynamic var depth = 0.0
dynamic var width = 0.0
dynamic var cabDescription = ""
dynamic var sqFt = 0.0
dynamic var room: Room?
//var linkToRoom: [Room] {
// return linkingObjects(Room.self, forProperty: "countertops")
//}
override static func primaryKey() -> String {
return "id"
}
}
以下是我用来保存数据的函数：
@IBAction func saveButton() {
jobs.name = nameTF.text!
jobs.address = addressTF.text!
jobs.phone = phoneTF.text!
jobs.email = emailTF.text!
jobs.notes = notesTV.text!
jobs.discount = Double(discountTF.text!)!
jobs.material = Double(materialTF.text!)!
jobs.edge = Double(edgeTF.text!)!
jobs.splash = Double(splashTF.text!)!
jobs.trip = Double(tripTF.text!)!
do {
try! realm.write {
realm.add(jobs)
}
}
print(jobs)
// print(Realm.Configuration.defaultConfiguration.path!)
}
func saveData(){
rooms.name = nameTF.text!
rooms.material = Double(materialTF.text!)!
rooms.edge = Double(edgeTF.text!)!
rooms.splash = Double(splashTF.text!)!
rooms.notes = notesTV.text
rooms.sinkType = sinkTypeTF.text!
rooms.sinkModel = sinkModelTF.text!
rooms.numberOfSinks = Int(numberSinksTF.text!)!
rooms.faucet = faucetTF.text!
rooms.rangeType = rangeTF.text!
rooms.jobs?.id = keyValueLabel.text!
//rooms.linksToJob
do {
try! realm.write {
realm.add(rooms)
}
}
print(rooms)
}
和
@IBAction func addNextButton(sender: AnyObject) {
// self.realm.beginWrite()
let realm = try! Realm()
if widthTF.text != "" {
Calculations.depth = Double(depthTF.text!)!
Calculations.width = Double(widthTF.text!)!
let depthAdded = depthTF.text
cabinetDepth.append(Double(depthAdded!)!)
let widthAdded = widthTF.text
cabinetWidth.append(Double(widthAdded!)!)
let descriptionAdded = pickerLabel.text
cabinetDescription.append(descriptionAdded!)
let runningTotal = Calculations.squareFeet()
squareFeetToBeAdded.append(runningTotal)
let sum = squareFeetToBeAdded.reduce(0,combine: {$0 + $1})
let roundedSqFt = Double(round(sum * 10) / 10)
sqFtLabel.text = "\(roundedSqFt)"
countertops.depth = Double(depthTF.text!)!
countertops.width = Double(widthTF.text!)!
countertops.cabDescription = pickerLabel.text!
countertops.sqFt = Double(sqFtLabel.text!)!
//countertops.linkToRoom
do {
try realm.write {
realm.add(countertops)
}
print(countertops)
} catch {
print("an error occurred")
}
widthTF.text = ""
numberTable.reloadData()
widthTF.becomeFirstResponder()
}
}
当我保存数据并打印结果时，我得到的是：
Job {
id = 00F95F55-54D8-426E-B483-C990A4171002;
name = Ken;
address = Address;
phone = phone;
email = email;
notes = Notes :;
material = 8;
edge = 0;
splash = 4;
discount = 1;
trip = 0;
rooms = RLMArray <0x7ffef9df29c0> (
);
}
Room {
id = 7D3F86B9-FCD7-4CB7-AD6E-9B8141A7390C;
name = Kitchen;
material = 9;
edge = 0;
splash = 4;
sinkType = Undermount Kitchen;
sinkModel = 50/50 Stainless Steel;
numberOfSinks = 1;
faucet = Single Hole;
rangeType = Free Standing Range;
notes = Notes:;
jobs = (null);
countertops = RLMArray <0x7ffef9df3720> (
);
}
Countertop {
id = 992B8BAE-392F-4513-85DC-CBA191D2AE08;
depth = 25.5;
width = 65;
cabDescription = Cabinet;
sqFt = 11.5;
room = (null);
}
如您所见，链接返回null。 请告诉我这里我做错了什么。 注意：我注释掉了模型中的linkingObjects，因为它导致了崩溃。我不确定为什么。
答案 0 :(得分：1)
添加时，应该使用对现有领域对象的引用。所以不是这样：
func saveData(){
rooms.name = nameTF.text!
rooms.material = Double(materialTF.text!)!
rooms.edge = Double(edgeTF.text!)!
rooms.splash = Double(splashTF.text!)!
rooms.notes = notesTV.text
rooms.sinkType = sinkTypeTF.text!
rooms.sinkModel = sinkModelTF.text!
rooms.numberOfSinks = Int(numberSinksTF.text!)!
rooms.faucet = faucetTF.text!
rooms.rangeType = rangeTF.text!
rooms.jobs?.id = keyValueLabel.text!
//rooms.linksToJob
do {
try! realm.write {
realm.add(rooms)
}
}
print(rooms)
}
您可以使用以下内容：
let realm = try! Realm()
let room = realm.create(Room.self)
room.name = nameTF.text!
room.material = Double(materialTF.text!)!
...
let job = realm.create(Job.self)
job.name = "My job name"
...
room.job = job
由于您在单独的屏幕上输入这些内容，您将添加一个房间，然后您想要添加一个作业：
if let existingJob = realm.objects(Job).filter("name == '\(jobNameToLookup)'").first {
room.job = existingJob
}
对于列表，只需要做room.countertops.append（newCountetop），其中newCountertop是realm.create的结果
答案 1 :(得分：0)
因为您可以单独将每个对象添加到Realm中而无需链接。如果您要关联对象，则应将对象添加到List属性，例如rooms和countertops。对于一对一的关系，您应该将对象分配给属性。
所以你需要编写如下代码：
...
rooms.faucet = faucetTF.text!
rooms.rangeType = rangeTF.text!
...
rooms.countertops.append(countertops)
...
jobs.rooms.append(rooms)
和
...
countertops.rooms = rooms
...
rooms.jobs = jobs
有关详细信息，另请参阅文档：
答案 2 :(得分：0)
感谢奥斯汀让我走上正轨。这是最终完成它的代码。
@IBAction func roomSaveNextBtnPushed(_ sender: UIButton) {
let room = Room()
room.roomName = roomTF.text!
room.material = materialTF.text!
room.edge = edgeTF.text!
room.job = realm.objects(Job.self).last
try! realm.write {
realm.add(room)
print(room)
}
}
链接是在＆＃39; realm.object（Job.self）.last＆＃39;代码行。这为预期的工作增加了一个空间。
奥斯汀的例子中的建议＆＃39;让room = realm.create（Room.self）＆＃39;导致错误，项目无法编译。
我正在使用Xcode 8和Swift 3以及Realm-swift 1.1.0
再次感谢那些提供帮助的人。