update key values of NSManagedObjects safely

update key values of NSManagedObjects safely

By : ddev
Date : October 19 2020, 08:10 AM
like below fixes the issue I've had this exact problem. Here's what you do.
With Core Data, you can easily find out what property names are valid for the object. Get a reference to the managed object's entity, and then ask the entity for the properties. You'd use managedObject.entity.propertiesByName. The result is a dictionary where the keys are valid properties. The code would be something like
code :
let properties = managedObject.entity.propertiesByName
for (key, value) in fields {
    if properties[key] != nil {
        managedObject.setValue(value, forKey: key)
    } else {
        print("Unknown key: \(key)")

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Core Data – NSManagedObjects in instance variable update

Core Data – NSManagedObjects in instance variable update

By : Shane Miles
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The array you get back from the fetch request holds references to live managed objects. Unless you change a different fetchLimit or batchSize you get an array with as many fault objects as the query would return objects.
When you access a property of one of these fault objects CoreData retrieves the actual data for all the properties transparently and returns these to you.
Fetch and update, or create and delete NSManagedObjects in Core Data?

Fetch and update, or create and delete NSManagedObjects in Core Data?

By : Aquib Khan
Date : March 29 2020, 07:55 AM
hop of those help? Create and destroy is the best practice. Reuse has implications when your application gets more complex and risks merge problems. The cost difference between an insert and an update is minimal.
How to update NSManagedObjects in Core Data database in code?

How to update NSManagedObjects in Core Data database in code?

By : tihor24
Date : March 29 2020, 07:55 AM
should help you out I found the solution to this problem. After updating the name of the album, I call "saveToURL:forSaveOperation:completionHandler:", one method of UIManagedDocument. With this method, the Core Data database are updated properly.
CoreData NSSet-Like behavior for NSManagedObjects with the same values

CoreData NSSet-Like behavior for NSManagedObjects with the same values

By : Julia.J
Date : March 29 2020, 07:55 AM
should help you out What I do now is checking manually, if there is a Object with same Attributes in my MOC. If there is one, I skip the creation. I know, it is a bit inefficient but with my expected number of messages, this should be no problem.
code :
NSFetchRequest * fr = [NSFetchRequest fetchRequestWithEntityName:CDEntityNameMessage];
  [fr setPredicate:[NSPredicate predicateWithFormat:@"text == %@ AND date == %@ AND conversation.user.objectId == %@", message.text, message.date, chatpartner.objectId]];
  NSArray * results = [[self managedObjectContext] executeFetchRequest:fr error:nil];
  if (results && results.count > 0) {
Update an Array of NSManagedObjects

Update an Array of NSManagedObjects

By : user2549042
Date : March 29 2020, 07:55 AM
seems to work fine I'm using CoreData and swift and trying to update an array of NSManagedObjects. However, I am receiving "Value of type '[NSManagedObject]' has no member 'setValue'" when I attempt to update both keys within the record in context. I'm using the following line of code to perform the update: "erManagedObject.setValue([(true, forKey: "aKey"),(false, forKey: "anotherKey")])" , Replace
code :
 for i in 1...recordCount {
    // I receive the error here
    erManagedObject.setValue([(true, forKey: "aKey"),(false, forKey: "anotherKey")])
erManagedObject.forEach { 
   $0.setValue(true, forKey: "aKey")
   $0.setValue(false, forKey: "anotherKey")
 let request = NSFetchRequest<NSFetchRequestResult>(entityName:entity)

    do {
         let result = try context.fetch(request) as! [ModelName]
         result.forEach {
           $0.someKey = ""
         // save context here  
     catch {
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