如何使用Realm（Swift）在对象中添加和更新值？

Question

我下面有两个课程。 我想对这些对象执行（添加，更新和删除）之类的操作。

CheckOutImageList类是包含图像的对象的数组，而CheckOutDetail类是包含图像对象的对象。

class CheckOutImageList: Object {

    @objc dynamic var imageUrl = ""
    @objc dynamic var imageName = "test"
    @objc dynamic var isProfile = Bool()
    @objc dynamic var imageDesc = ""

    override static func primaryKey() -> String? {
        return "imageName"
    }
}

class CheckOutDetail: Object {

    @objc dynamic var taskId = 0
    var imageList = List<CheckOutImageList>()
    @objc dynamic var remarks = ""
    @objc dynamic var isFollowUp = Bool()
    @objc dynamic var followDate = ""
    @objc dynamic var followTime = ""

    override static func primaryKey() -> String? {
        return "taskId"
    }
}

我可以对CheckOutDetail类执行添加和更新操作，但需要帮助来添加，更新和删除图像列表数组。

Answer 1

您可以将CheckOutImageList元素附加到对象CheckOutDetail 。

尝试这个 ：

let realmIn = try! Realm()

var checkOutDetail = CheckOutDetail()
checkOutDetail.taskId = 1
checkOutDetail.imageList = "imageList"
checkOutDetail.isFollowUp = "isFollowUp "
checkOutDetail.followTime = "followTime"


// You can use for to append multiple elements to list
let newCheckOutImageList = CheckOutImageList()
newCheckOutImageList.imageUrl = "url"
nweCheckOutImageList.imageName = "imageName"
newCheckOutImageList.isProfile = "isProfile"
newCheckOutImageList.imageDesc = "imageDesc"

checkOutDetail.imageList.append(newCheckOutImageList)

try! realmIn.write {
     realmIn.add(checkOutDetail, update: true)
}

Answer 2

为了解决此问题，我对对象进行了一些更改。 我所做的只是为CheckOutDetails和CheckOutImageList创建两个单独的对象，如下所示：

class CheckOutImageList: Object {

    @objc dynamic var taskId = 0
    @objc dynamic var imageUrl = ""
    @objc dynamic var imageName = ""
    @objc dynamic var isProfile = Bool()
    @objc dynamic var imageDesc = ""

    override static func primaryKey() -> String? {
        return "imageName"
    }
}

class CheckOutDetail: Object {

    @objc dynamic var taskId = 0
    @objc dynamic var remarks = ""
    @objc dynamic var isFollowUp = Bool()
    @objc dynamic var followDate = ""
    @objc dynamic var followTime = ""

    override static func primaryKey() -> String? {
        return "taskId"
    }
}

//Code to update old data or add new image data in the CheckOutImageList Object
if self.checkImageNameExist(imageName: imgDetail.fileName) {
    try! realm.write {
        realm.add(obj, update: true) //obj is of type CheckOutImageList
    }
} else {
    try! realm.write {
        realm.add(obj)
    }
}

//Function will return true if primary key already exist else return false
func checkImageNameExist(imageName: String) -> Bool {
    return realm.object(ofType: CheckOutImageList.self, forPrimaryKey: imageName) != nil
}

并使用CheckOutDetails中的taskId作为外键来获取相同ID的详细信息。