dispatch_async task problems with context

Question

I am using a dispatch_async task to retrieve a list with some contacts.
When selecting a contact from this list, I call Storage Manager to retrive some further information for this contact.
I get the error: Illegal attempt to establish a relationship...between objects in different contexts.
How to solve this?
Here is my code:

 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
      sections = [self getContactList];
   });

informationList = [StorageManager getInfoForContact:[sections objectAtIndex:1]];

The error is at the line with informationList. Can someone help me to solve this?

Answer 1

I don't have the whole picture of your problem. However you are calling [self getContactList] into a async block. So, while [self getContactList] is executing the next line outside the block will be called. That means:

informationList = [StorageManager getInfoForContact:[sections objectAtIndex:1]];

is executed before:

sections = [self getContactList];

Probably your error is there.

Try:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
    sections = [self getContactList];
    dispatch_sync(dispatch_get_main_queue(), ^{
        informationList = [StorageManager getInfoForContact:[sections objectAtIndex:1]];
    });
});