user3739902 user3739902 - 3 months ago 7
Swift Question

fetching a custom object from core data into an array

I'm having trouble fetching my object from core data. Object looks like this:

class cilj: NSObject {
var imeCilja: String
var slikaCilja: String }


My entity is called Entity and has two Attributes "tekst" and "slika", both of type String. My save func is this:

func saveImage(goalName:String, imageName:String) {

let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let managedContext = appDelegate.managedObjectContext

let entityDescription = NSEntityDescription.entityForName("Entity", inManagedObjectContext:managedContext)

let thingToSaveToCD = NSManagedObject(entity: entityDescription!, insertIntoManagedObjectContext: managedContext)

thingToSaveToCD.setValue(globalGoalTitle, forKey: "tekst")
thingToSaveToCD.setValue(globalGoalImagePath, forKey: "slika")

do {
try managedContext.save()
print("managed to save to core data")
//5
// listaObjekata.append(cilj5) as! [cilj]
} catch let error as NSError {
print("Could not save \(error), \(error.userInfo)")
}

}


I use an alertController to pick up the text, and imagePicker to pick up image that I then store in documents and get the path. I store both of these in a global variables visible in the code above.

My fetch function is :

func coreDataFetch(){

//core data fetch

//1
let appDelegate =
UIApplication.sharedApplication().delegate as! AppDelegate

let managedContext = appDelegate.managedObjectContext

//2
let fetchRequest = NSFetchRequest(entityName: "Entity")


do {
let fetchedResults = try managedContext.executeFetchRequest(fetchRequest) as! [cilj]
listaObjekata = fetchedResults


} catch let error as NSError {
print("Could not fetch \(error), \(error.userInfo)")
}

}


I have been through ray wenderlich's article on Core Data, Apple's documentation, a couple of YT videos but I still seem to be missing something. I would greatly appreciate any help. Thanks !

EDIT - here is my cellForRowAtIndexPath

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {


let cell = tableView.dequeueReusableCellWithIdentifier("myCell") as! cellController
let ciljZaPrikaz = listaObjekata[indexPath.item]

cell.labelText.text = ciljZaPrikaz.imeCilja ?? "no text found"

let path = getDocumentsDirectory().stringByAppendingPathComponent(ciljZaPrikaz.slikaCilja)
cell.imageToShow.image = UIImage(contentsOfFile: path)

return cell
}

Answer

You are doing correct but just missing type casting to your model. Try below:

    let fetchedResults =  try managedContext.executeFetchRequest(fetchRequest)
    if let results = fetchResults where results.count > 0 {
        let entityModel = results[0] as? Entity
        let tekst = entityModel.tekst
    }