CODEWITHSUNDEEP
iosjsonswiftcore-data
user7413163
user7413163

Reputation: 205

Save complex JSON to Core Data in Swift

I want to save the JSON Result from web service to Core data, following is the code for JSON parsing.

if let jsonResult = try JSONSerialization.jsonObject(with: JSONData!, options: [.mutableContainers]) as? [String: AnyObject]

If i prints jsonResult, following is the output

["Code": 00, "Desc": success, "iinData": <__NSArrayM 0x1c02531a0>
{
  name = “AAA”;
  iin = 123456;
  isOn = 0;
},
{
  name = "Allahabad Bank";
  iin = 608112;
  isOn = 0;
},
)

I can able to insert Code, Desc into Entity1, but how to insert innData into Entity2 .

Entity1 Structure Entity2 Structure

Following is the code for inserting JSON result into core data

func createEntity1From(dictionary: [String: AnyObject]) -> NSManagedObject? {
    let context = CoreDataStack.sharedInstance.persistentContainer.viewContext
    if let Entity1 = NSEntityDescription.insertNewObject(forEntityName: “ParamDownload”, into: context) as? ParamDownload {
        Entity1.Code= dictionary[“name”] as? String
        Entity1.desc = dictionary[“desc”] as? String
        return Entity1
    }
}

Upvotes: 4

Views: 9335

Answers (3)

Rahul Gusain
Rahul Gusain

Reputation: 275

I save JSON by converting it in into Data and save that Data in CoreData

Following Code works for me......

func saveSpotsLocation(model: SpotsModel, packageId: String, regionName: String) {
  let newUser = NSEntityDescription.insertNewObject(forEntityName: "SpotsDetail", into: context)
  do {
    let data = NSKeyedArchiver.archivedData(withRootObject: model.dictionaryRepresentation())
    newUser.setValue(data, forKey: "data")
    newUser.setValue(packageId, forKey: "packageId")
    newUser.setValue(regionName, forKey: "regionName")
    try context.save()
  } catch {
    print("failure")
  }
}

Upvotes: 0

user7413163
user7413163

Reputation: 205

This also worked fine for me,

private func createParamDownloadEntityFrom(dictionary: [String: AnyObject]) -> NSManagedObject? {
    let context = CoreDataStack.sharedInstance.persistentContainer.viewContext

    if let paramEntity = NSEntityDescription.insertNewObject(forEntityName: “ParamDwonload”, into: context) as? ParamDownload {
        paramEntity.code = dictionary[“code”] as? String
        paramEntity.desc = dictionary[“desc”] as? String
        let innData = dictionary["iinData"] as! NSArray


        for i in 0..<(innData.count-1) {

            if let nameEntity = NSEntityDescription.insertNewObject(forEntityName: Name
                , into: context) as? Name {

                if let val = innData[i] as? [String: Any] {
                    nameEntity.bankName = val[“name"] as? String
                    nameEntity.iin = val[“iin"] as? String
                    if let isOn = Int16(val[“isOn"] as! String) {
                        nameEntity.isOnus = isOn
                    }
                    paramEntity.addToNames(nameEntity)
                }

            }
        }
        return paramEntity
    }

Upvotes: -1

vadian
vadian

Reputation: 285059

It's quite easy to decode the JSON directly into Core Data with Decodable

  • First of all create extensions of CodingUserInfoKey and JSONDecoder to be able to pass the managed object context

    extension CodingUserInfoKey {
    static let context = CodingUserInfoKey(rawValue: "context")!
}

extension JSONDecoder {
    convenience init(context: NSManagedObjectContext) {
        self.init()
        self.userInfo[.context] = context
    }
}

  • Add conformance to Decodable in both classes

    class Name: NSManagedObject, Decodable {

class ParamDownload: NSManagedObject, Decodable {

  • In the class Name (not the extension) add

    private enum CodingKeys: String, CodingKey { case name, iin, isOn }

required convenience init(from decoder: Decoder) throws {
    guard let context = decoder.userInfo[.context] as? NSManagedObjectContext else { fatalError("NSManagedObjectContext is missing") }
    let entity = NSEntityDescription.entity(forEntityName: "Name", in: context)!
    self.init(entity: entity, insertInto: context)
    let values = try decoder.container(keyedBy: CodingKeys.self)
    name = try values.decode(String.self, forKey: .name)
    iin = try values.decode(String.self.self, forKey: .iin)
    isOn = try values.decode(Bool.self.self, forKey: .isOn)
}

  • In the class ParamDownload (not the extension) add

    private enum CodingKeys: String, CodingKey { case code = "Code", desc = "Desc", names = "iinData" }

required convenience init(from decoder: Decoder) throws {
    guard let context = decoder.userInfo[.context] as? NSManagedObjectContext else { fatalError("NSManagedObjectContext is missing") }
    let entity = NSEntityDescription.entity(forEntityName: "ParamDownload", in: context)!
    self.init(entity: entity, insertInto: context)
    let values = try decoder.container(keyedBy: CodingKeys.self)
    code = try values.decode(String.self, forKey: .code)
    desc = try values.decode(String.self, forKey: .desc)
    names = try values.decode(Set<Name>.self, forKey: .names)
    names.forEach { $0.pd = self }
}

To decode the JSON create the Decoder with the convenience initializer

let decoder = JSONDecoder(context: CoreDataStack.sharedInstance.persistentContainer.viewContext)

the init methods handle the relationships.

I recommend to declare the Core Data attributes as much non-optional as possible.
If an attribute must be remain optional replace decode with decodeIfPresent.

Upvotes: 9

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