CODEWITHSUNDEEP
ioscore-dataios7
Amit
Amit

Reputation: 1043

Core data deleted items are visible even after delete (till app relaunches)

I am having a many to many relationship between two tables say table A and B.

For the sake of business logic I have put this property with 'No Action' as deletion rule.

step 1: Now at a point I am deleting table A items.

step 2: After deletion of tableA items I want to delete those items in Table B which are not connected with any item in table A.

so the code snippet for deletion for step 2 is somewhat like this:

for (TableBItem* item in fetchedObjects) {
    if ([[item.tableAproperty allObjects] count] == 0) {
        [context deleteObject:item];
    }
} 
 //save context
 [context save:&error]

After this when i am fetching tableB objects it shows me even those items which i tried to delete.

If I kill the application and launch again then the fetching items works as expected.

Any idea what might be going wrong here. Thanks in advance.

Upvotes: 1

Views: 372

Answers (2)

Mundi
Mundi

Reputation: 80273

A proven method to accomplish this is to override the remove object Xcode-generated setter method in your managed object subclass for TableBItem (a terrible name BTW - also, tableAProperty is misleading as it is a relationship and not an attribute). 

-(void)removeTableAPropertyObject:(TableAItem *)value {
     [super removeTableAPropertyObject:value];
     if (!self.tableAProperty.count) {
        [self.managedObjectContext deleteObject:self];
     }
}

Upvotes: 1

Joride
Joride

Reputation: 3763

One thing that comes to mind is to set the delete rule to 'nullfiy'. This way, deleting an entity A will nullify the relation from B to A. Hence, no B will be linked to A after deleting all A's. I can't really give you an explanation about the difference after re-launch, I guess some staleness or cache/faulting effects.

Upvotes: 0

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