CODEWITHSUNDEEP
iosobjective-ccocoa-touchcore-data
NNikN
NNikN

Reputation: 3852

NSManagedObject to save or insert check

I have a UIViewController, which has Save button in UINavigationBar.

This UIViewController is used for saving a New User as well as Editing a User.

On, save button I used to always call - (void)insertObject:(NSManagedObject *)object; which fails when I am editing a user, as that managed object is already available.

So, I am using the following check. Is this is the correct way for insert or saving editing user?

NSManagedObject *managedObject = someObject;
NSManagedObjectContext *managedContext = someContextObject;
NSError *error;
if(m.objectID.isTemporaryID){
//This means its a new object so, first insert
[managedContext insertObject:managedObject];
}

[managedContext save:&error];

Upvotes: 0

Views: 125

Answers (1)

Wayne Hartman
Wayne Hartman

Reputation: 18487

My pattern for this is to create a property on the view controller for my managed object. Pretending that your user class is User:

@property (nonatomic, strong) User *user;

If I am doing an edit the property will be set with an existing user. If I am doing a create it will be nil. In my save logic I do a check:

- (void)didSelectSaveButton:(id)sender {
    if (!self.user) {
        self.user = [NSEntityDescription insertNewObjectForEntityForName:@"User" 
                                                  inManagedObjectContext:context];
    }

    //  Rest of the logic to map the UI elements to the properties of my user model
    //  objects, referencing self.user

    NSError *error = nil;
    BOOL success = [managedObjectContext save:&error];

    // error handling
}

This way, my logic for populating the information for a user is the same, regardless if it is an "insert" or "update".

Upvotes: 1

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