iphone coredata removing records between two entities connected by relation ship

Question

I'm implementing core data in my iphone app. It has two entities. Entity1: LatestData Entity2: LatestDetailedData

LatestData has URL, publishedDate, heading LatestDetailedData has URL, NewsDescription, PublishedDate, Author

Both entities have same URL for a record. Both the entities are connected with inverse relation ship. And the relation ship is "delete->Cascaded"

What I want: If I remove a record in LatestData, I want the record with same URL in LatestDetailedData must also be deleted.

How?

Answer 1

when you create the entities you need to create the relationship too

LatestDetailedData * entity2 = [[NSEntityDescription insertNewObjectForEntityForName:@"LatestDetailedData" inManagedObjectContext:context]; 
entity1.lastestdetail=entity2;

if you are just relying on a URL field, then thats bad practice. Set up the relationship in coredata and the cascaded deletes will take care of themselves.

Answer 2

If I am understanding you correctly, you are using a relationship and it has an inverse. If that is the case then when you delete one then Core Data will automatically delete the other and you don't need to do anything extra.

What are you seeing that suggests that is not happening?

Update

Since you are using multiple threads, are you using one NSManagedObjectContext per thread? If so, are you updating all of the threads when a save occurs? I suspect one of those two is not occurring and therefore causing your issue.