CODEWITHSUNDEEP
swiftcore-data
Denis Kakačka
Denis Kakačka

Reputation: 727

Core Data check if is already saved, Swift

im building app where random quote from plist is displaying and you can save it to favorites(core data), I want to check if my random generated quote already exists in core data or no, I just want to change save button if its already saved

Quote.swift:

var quotesPlist: NSArray! = []

override func awakeFromNib() {
    loadQuote()
}

func loadQuote(){
    let path = NSBundle.mainBundle().pathForResource("quotesList", ofType: "plist")
    quotesPlist = NSArray(contentsOfFile: path!)
    quoteLbl.text = quotesPlist[Int(randomNumber())] as? String
}

SavedQuote properties:

@NSManaged var quote: String?
@NSManaged var creationDate: NSDate?
@NSManaged var uuid: String?

this is HomeVC:

 func createQuoteFromNib() -> QuoteView! {
    return NSBundle.mainBundle().loadNibNamed("QuoteView", owner: self, options: nil)[0] as? QuoteView

}

@IBAction func saveACTION(sender: UIBarButtonItem) {

    if let label = currentQuote.quoteLbl.text where label != "" {

        let app = UIApplication.sharedApplication().delegate as! AppDelegate
        let context = app.managedObjectContext
        let entity = NSEntityDescription.entityForName("SavedQuotes", inManagedObjectContext: context)!
        let quote = SavedQuotes(entity: entity, insertIntoManagedObjectContext: context)

        quote.quote = currentQuote.quoteLbl.text
        quote.creationDate = NSDate()
        quote.uuid = NSUUID().UUIDString
        context.insertObject(quote)


        do {
            try context.save()
        } catch let err as NSError {
            print(err.debugDescription)
        }

    }
}

this is my FavoritesVC:

 var quotesArray = [SavedQuotes]()

@IBOutlet weak var tableView: UITableView!

func fetchAndSetResults(){
    let app = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = app.managedObjectContext
    let fetchRequest = NSFetchRequest(entityName: "SavedQuotes")
    let dateSort = NSSortDescriptor(key: "creationDate", ascending: false)
    fetchRequest.sortDescriptors = [dateSort]

    do {
        let results = try context.executeFetchRequest(fetchRequest)
        quotesArray = results as! [SavedQuotes]
    } catch let err as NSError {
        print(err.debugDescription)
    }
}

Upvotes: 0

Views: 591

Answers (1)

Wain
Wain

Reputation: 119031

It isn't clear how you're generating this new quote. At minimum you need to use a fetch request to check if the quote exists before you call insertIntoManagedObjectContext. You can do that as soon as the quote exists and you're configuring the view (with the quote text and the save button).

Your fetch request uses a simple predicate to check for a quote with matching quote text.

You already have a fetch request to list all the quotes, so all you need to add to that for the check is a predicate with format "quote = %@" and check the count of the results (which should always be either 0 or 1 (meaning save and don't save respectively).

Upvotes: 2

Related Questions