Question

我有一节课Place＆amp;其他类为Address。现在一个地方只有一个地址所以我创建了一个关系。现在我想保存这个地方然后我无法做到.Below是我为此写的代码功能。

if #available(iOS 10, *) {
            placeInfo =  NSEntityDescription.insertNewObject(forEntityName: "PlaceInfo", into: appDelegate.persistentContainer.viewContext) as? PlaceInfo
        } else {
            placeInfo = NSEntityDescription.insertNewObject(forEntityName: "PlaceInfo", into: appDelegate.managedObjectContext!) as? PlaceInfo
        }
            var cordinates:[String] = []
            placeInfo?.title = Place.shared.title ?? ""
            placeInfo?.desc = Place.shared.desc ?? ""
            placeInfo?.id = "Place_" + String(Utility.shared.currentTimeStamp())
             let spotLocation  = Place.shared.address

            if let lat = spotLocation?.lat, let long  = spotLocation?.long {
                cordinates = [lat.toString(),long.toString()]
            }
            let address  = NSEntityDescription.insertNewObject(forEntityName: "PlaceAddress", into: appDelegate.managedObjectContext!) as? PlaceAddress
            address?.street =  "Street"
            address?.landmark  = "LANDMARK"
            address?.city = "MYCITY"
            address?.state =   "SATTE"
            address?.state =  "INDIA"
            address?.pincode  =  "1256325"

            placeInfo?.isuploaded = true
            if let spotid = placeInfo?.id {
               // saveMediaToDB(id: spotid)
            }
            placeInfo?.address_rel = address

Placeinfo类

import Foundation
import CoreData


extension PlaceInfo {

    @nonobjc public class func fetchRequest() -> NSFetchRequest<PlaceInfo> {
        return NSFetchRequest<PlaceInfo>(entityName: "PlaceInfo")
    }

    @NSManaged public var desc: String?
    @NSManaged public var hasmedia: Bool
    @NSManaged public var id: String?
    @NSManaged public var isuploaded: Bool
    @NSManaged public var title: String?
    @NSManaged public var address_rel: PlaceAddress?
    @NSManaged public var files_rel: NSSet?

}

// MARK: Generated accessors for files_rel
extension PlaceInfo {

    @objc(addFiles_relObject:)
    @NSManaged public func addToFiles_rel(_ value: FilesInfo)

    @objc(removeFiles_relObject:)
    @NSManaged public func removeFromFiles_rel(_ value: FilesInfo)

    @objc(addFiles_rel:)
    @NSManaged public func addToFiles_rel(_ values: NSSet)

    @objc(removeFiles_rel:)
    @NSManaged public func removeFromFiles_rel(_ values: NSSet)

}

Answer 1

您是否添加了以下代码行？

do {
    try managedObjectContext.save()
} catch {
    fatalError("Failure to save context: \(error)")
}

使用关系类在coredata中保存数据？

1 个答案: