Fetch of Core-Data is resulting in duplicate items - swift

Question

In my iOS Xcode8 project using Swift, I'm performing a fetch of my Core-Data:
func searchFoods() {
let context: NSManagedObjectContext = appDel.managedObjectContext
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Foods")
print("Searching Database for \(searchVariable)...")
var subPredicates : [NSPredicate] = []
let codeSearch = NSPredicate(format: "codeText contains[c] %#", "\(searchVariable)")
subPredicates.append(codeSearch)
request.predicate = NSCompoundPredicate(orPredicateWithSubpredicates: subPredicates)
request.returnsObjectsAsFaults = false
do {
let results = try context.fetch(request)
if results.count > 0 {
for result in results as! [NSManagedObject] {
if let item = result.value(forKey: "title") as? String {
// Maybe put a loop of some kind to only append the found item count??
searchArray.append(item)
myTableView.reloadData()
}
}
}
} catch {
print("Fetch failed...")
}
}
However my searchArray that is a [String] of the search results created many duplicates I know are not there; it's listing them 2 or 3 times. Can't figure out how to limit the appending to just the result count amount. If I search fruit, it might return an array like bananas, strawberries, peaches, oranges, bananas, strawberries, peaches, oranges etc, repeating. Can someone please help?

Answer 1

There's nothing in the code that would cause duplicates in the fetch results. If they're not actually present in the persistent store, the likely cause is that you're doing this:
searchArray.append(item)
But there's no sign of ever clearing out past results. Your sample results are consistent with this-- if there are four results, you add them to the array once, then later add them again.
It's also possible that there's a problem with your table view data source methods, but you're probably driving that directly from the contents of searchArray.