nsmanagedobject

Phew, sorry for the long title. I have a single Managed Object Context where I am storing songs derived from two different locations. I get some of the songs from the persistent storage on the phone (using Core Data), and I pull some of the songs from an online database. Both of the songs are of the same MananagedObject subclass. I would like both of these songs to be in a single context because I would like them both to show up on a table view connected with an NSFetchedResultsController. The problem occurs when I would like to save one of the songs. I don't want to save all of the songs that

I am a noob at core data, so here goes. I have a core data object, for example student. The student has mane attributes, like name, age, dob, address, and so on. Now I need to display all these attributes into a table view. Is there any easy way to iterate through the object student? Or do I have to convert the data into some type of dictionary? If I need to convert it to a dictionary is there any support for it? Or do I have to write the function my self. Many thanks for your help, Stephen Here's a very simple way to iterate over an NSManagedObject: NSEntityDescription *entity =

I am using core data framework to manage objects. I have an entity which has several attributes of decimal types. Among them is an attribute which is mathematically calculated from other attributes. Example: @interface Marks : NSManagedObject { } @property (nonatomic, retain) NSDecimalNumber * answerGradeA; @property (nonatomic, retain) NSDecimalNumber * answerGradeB; @property (nonatomic, retain) NSDecimalNumber * answerGradeC; @property (nonatomic, retain) NSDecimalNumber * total; Here I want attribute total = 3xanswerGradeA + 2xanswerGradeB + 1xanswerGradeC . If it is possible to do like

I'm in need of some assistance for an issue I am experiencing with MagicalRecord data importing. I was under the impression that MagicalRecord was able to handle relationship mapping without duplicating objects by looking at the primary keys ( relatedByAttribute ). Here's a simple JSON: [ { parentId: "<unique id>", parentName : "<name>", children : [ { childId: "<unique id>", childName: "<name>" }, { childId: "<unique id>", childName: "<name>" } ] }, { <another parent with children> } ] I've got an NSManagedObject Parent which has a to-many relationship with a Child NSManagedObject. The

I have an entity in my core data model like this: @interface Selection : NSManagedObject @property (nonatomic, retain) NSString * book_id; @property (nonatomic, retain) NSString * contenu; @property (nonatomic, retain) NSNumber * page_id; @property (nonatomic, retain) NSNumber * nbrOfOccurences; @property (nonatomic, retain) NSString * next; @property (nonatomic, retain) NSString * previous; I have created many Selection s and saved them in Core Data and now I would like to delete some selections with some criteria. For example, I would like to delete a Selection object if matches the