CODEWITHSUNDEEP
iosswiftcore-dataxcdatamodel
Emil Adz
Emil Adz

Reputation: 41099

returnsObjectsAsFaults not working as expected

I created a Core Data object as follows:

@objc(Gates)
public class Gates : NSManagedObject {

    public class func getFetchRequest() -> NSFetchRequest<Gates> {
        let request = NSFetchRequest<Gates>(entityName: "Gates")
        request.returnsObjectsAsFaults = false
        return request
    }

    @NSManaged var updatedAt: String
    @NSManaged var objectId: String
    @NSManaged var identifier: String
    @NSManaged var name: String
    @NSManaged var address: String
    @NSManaged var dueDate: String
    @NSManaged var productionCode: String
    @NSManaged var locationCountry: String
    @NSManaged var locationCity: String
    @NSManaged var locationBuilding: String
    @NSManaged var locationLevel: String
    @NSManaged var locationRoom: String
    @NSManaged var locationRange: String
    @NSManaged var isFavorite: Bool

    public func setGateData(gateDict: [String: Any]) {
        updatedAt = gateDict["updatedAt"] as? String ?? ""
        objectId = gateDict["objectId"] as? String ?? ""
        identifier = gateDict["identifier"] as? String ?? ""
        name = gateDict["name"] as? String ?? ""
        isFavorite = gateDict["isFavorite"] as? Bool ?? false
        address = gateDict["address"] as? String ?? ""
        dueDate = gateDict["dueDate"] as? String ?? ""
        productionCode = gateDict["productionCode"] as? String ?? ""
        locationCountry = gateDict["locationCountry"] as? String ?? ""
        locationCity = gateDict["locationCity"] as? String ?? ""
        locationBuilding = gateDict["locationBuilding"] as? String ?? ""
        locationLevel = gateDict["locationLevel"] as? String ?? ""
        locationRoom = gateDict["locationRoom"] as? String ?? ""
        locationRange = gateDict["locationRange"] as? String ?? ""
    }
}

I also set this up in the xcdatamodeld:

enter image description here

Now, after I have saved the object in core data and I'm using the getFetchRequest() method that is part of the class which sets request.returnsObjectsAsFaults = false on the request but I still getting the following result when I try to print the fetched objects:

 <Gates: 0x60c0000959a0> (entity: Gates; id: 0xd000000005e40000 <x-
 coredata://B9C33A5D-BF96-433A-9186-F51AA253F488/Gates/p377> ; data: <fault>)

As you can see in this case the data is still data: <fault>.

Why is the object parameters are not retrieved even though I set request.returnsObjectsAsFaults = false? What am I missing?

Upvotes: 1

Views: 697

Answers (1)

Richard Witherspoon
Richard Witherspoon

Reputation: 5019

I'm having this issue and I found in my case instead of using the objects value in line, I initialize a variable with it first and then use that variable.

I would love to know if this is a Core Data bug or if I'm doing something wrong.

public class Person: NSManagedObject, Identifiable {
    @NSManaged public var firstName: String
    @NSManaged public var lastName: String
    @NSManaged public var emailAddress: String
}

This does not work all the time:


CoreDataManager.shared.persistentContainer.performBackgroundTask{ context in
    context.automaticallyMergesChangesFromParent = true
    context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
    
    do {
        let email = "[email protected]"
        let request = Person.getPersonWith(email: email)
        request.returnsObjectsAsFaults = false //DOES NOT WORK
        
        if let person = try context.fetch(request).first{
            print(person.fullName)
        }
    } catch{
        fatalError()
    }
}

However this does

CoreDataManager.shared.persistentContainer.performBackgroundTask{ context in
    context.automaticallyMergesChangesFromParent = true
    context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
    
    do {
        let email = "[email protected]"
        let request = Person.getPersonWith(email: email)
        
        if let person = try context.fetch(request).first{
            let fullName = person.fullName
            print(fullName)
        }
    } catch{
        fatalError()
    }
}

Upvotes: 0

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