Edit Question - KnowledgeHub

Title Body

I am using Apple's CoreDataBooks sample application as a basis for pulling data into a secondary managed object context in the background, and then merging that data into the primary managed object context. The data I am pulling in is a Book entity with a to-one relationship with an Owner entity (called "owner"). The Owner entity has a to-many relationship with the Book (called "books"). My data is an XML document of the form: <Owner> <Name>alexpreynolds</Name> <ID>123456</ID> </Owner> <Books> <Book>Book One</Book> <Book>Book Two</Book> ... <Book>Book N</Book> </Books> Book One through Book N are associated with one Owner ( "alexpreynolds, 123456" ). I am parsing this into an Owner instance and an NSMutableSet made up of Book instances. When I attempt to save the first time, it saves fine and the merged data shows up in the table view. On the second save, however, when the XML content contains a new book, it doesn't work. Here's what happens: I then attempt to load in an XML document that contains a new Book not already in the primary managed object context. The new Book is using the same Owner as that which is associated with the other Book s. I have routines that pick out this unique Owner managed object (which I already have in my primary managed object context) and the unique Book that is not found in the primary MOC. From this, I create a new Book object in the secondary MOC, and I set its " owner " relationship to point to the unique Owner I found in the primary MOC. When I sa

Tags (comma-separated) Cancel