hello I need to overwrite value on CoreData if already is. For example if already on CoreData I have Josh I need to delete this and next save new Josh
func save(value:String, forkey:String) {
let context = getContext()
let entity = NSEntityDescription.entity(forEntityName: "Lastname", in: context)
let add = NSManagedObject(entity: entity!, insertInto: context)
add.setValue(value, forKey: forkey)
do {
try context.save()
print("save -> \(value)")
} catch {
print("err \(error)")
}
}
Solved
- Fetch the object.
- Create a new object if there is none.
- Update the attributes.
- Save the context.
func save(value:String, for key:String) {
let context = getContext()
let request = NSFetchRequest(entityName: "Lastname")
let predicate = NSPredicate(format:"%K == %@", value, key)
request.predicate = predicate
do {
let fetchResults = try context.executeFetchRequest(request)
let object : NSManagedObject
if fetchResults.isEmpty {
let entity = NSEntityDescription.entity(forEntityName: "Lastname", in: context)
object = NSManagedObject(entity: entity!, insertInto: context)
} else }
object = fetchResults[0]
}
object.setValue(value, forKey: key)
try context.save()
print("save -> \(value)")
} catch {
print("err \(error)")
}
}
Note: I'm not using Swift 2 anymore, a compiler error might occur.
We can check whether values are there or not. Then update and Create values in database
class func checkAndUpdateAtIndex(entry_id: String, comment_text: String, comment_name: String, comment_pic: String, comment_date: String, comment_id: String, comment_isDeleted: String, comment_userid: String) {
let context: NSManagedObjectContext = DataAccess.shared.managedObjectContext
let request = NSFetchRequest(entityName: "Comment")
request.predicate = NSPredicate(format: "comment_id = %@", comment_id)
if let fetchResults = (try? DataAccess.shared.managedObjectContext.executeFetchRequest(request)) as? [NSManagedObject] {
if fetchResults.count != 0{
//update value
var managedObject = fetchResults as! [Comment]
managedObject[0].setValue(entry_id, forKey: "entry_id")
managedObject[0].setValue(comment_text, forKey: "comment_text")
managedObject[0].setValue(comment_name, forKey: "comment_name")
managedObject[0].setValue(comment_pic, forKey: "comment_pic")
}else {
// create new entity if not found
let newItems = NSEntityDescription.insertNewObjectForEntityForName("Comment", inManagedObjectContext: context) as! Comment
newItems.entry_id = entry_id
newItems.comment_text = comment_text
newItems.comment_name = comment_name
newItems.comment_pic = comment_pic
}
do {
try context.save()
} catch {}
}
}
In this Update method I'm firstly getting that entity which we want to update and then storing new values in that place.
