CODEWITHSUNDEEP
iosxcodecore-datauitableview
doc92606
doc92606

Reputation: 701

How to get NSManagedObjectId and retrieve data

I have a TableViewController called HomeTableViewController loaded with data from a Core Data array. I attempted to get the object Id from the selected cell like so:

//Fetch Entity

NSManagedObjectContext *context = [self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"OwedMoney"];

//Create an array that stores the contents of that entity

youOweArray = [[context executeFetchRequest:fetchRequest error:nil] mutableCopy];

//Create managedObjectId

NSManagedObject *YouOweData  = [youOweArray objectAtIndex:0];
NSManagedObjectID *moID = [YouOweData objectID];

//Successfully got the managedObjectId

NSLog(@"This is the id %@", moID);

I was able to get the managedObjectId. But here comes the difficult part. Now I want to iterate through my array and get all the objects. Then I want to get the object that equals to the selected cell and access it's boolean value of "Paid". I did THAT like so:

 BOOL Found =  NO;
OwedMoney *OwedObject;
NSManagedObjectID *OwedId = [OwedObject objectID];

for (OwedMoney *OwedObject in youOweArray)
{

    NSLog(@"%@", OwedObject);
    if (OwedId == moID)
    {
        Found = YES;
        break;
    }

}

if (Found == YES)
{

BOOL isPaid = YES;
OwedMoney *Object = OwedObject;
Object.paid = [NSNumber numberWithBool:isPaid];

NSLog(@"Is it paid: %@",Object.paid? @"Yes":@"No");
}

Although when I run the application, Found is never equal to YES. This means my object Id's aren't matching up. I'd like to know how of a way to find the selected table view cell, grab the NSManagedObjectId from it, and then access it's attributes.

All help is appreciated, Thanks in advance.

Upvotes: 0

Views: 4280

Answers (2)

Thomas Abplanalp
Thomas Abplanalp

Reputation: 1

I think the problem is on line 9.

if(OweID == moID)

Probably the ID object (not the ID information itself) of the managed object changed. Using == compares only the references. Try to use

if([OweID isEqual::moID])

Thomas

Upvotes: 0

Kevin Enax
Kevin Enax

Reputation: 176

You're looping through the array, but never actually changing the OwedId to what item you're looking at in the array. This should work:

BOOL Found =  NO;
OwedMoney *Object;


for (OwedMoney *OwedObject in youOweArray)
{
    NSManagedObjectID *OwedId = [OwedObject objectID];

    NSLog(@"%@", OwedObject);
    if (OwedId == moID)
    {
        Found = YES;
        Object = OwedObject;
        break;
    }

}

if (Found)
{

    BOOL isPaid = Found;
    Object.paid = [NSNumber numberWithBool:isPaid];

    NSLog(@"Is it paid: %@",Object.paid.boolValue? @"Yes":@"No");
}

Upvotes: 1

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