Questions tagged [nsentitydescription]

An NSEntityDescription object is associated with a specific class whose instances are used to represent entries in a persistent store in applications using the Core Data Framework. Minimally, an entity description should have:

• A name
• The name of a managed object class (If an entity has no managed object class name, it defaults to NSManagedObject.)

NSEntityDescription class reference Source Using Entity Descriptions in Dictionaries

NSEntityDescription’s copy method returns an entity such that

[[entity copy] isEqual:entity] == NO

NSEntityDescription supports the NSFastEnumeration protocol. You can use this to enumerate over an entity’s properties, as illustrated in the following example:

 NSEntityDescription *anEntity = ...;
  for (NSPropertyDescription *property in anEntity) {
   // property is each instance of NSPropertyDescription in anEntity in turn
 }


   NSManagedObjectContext *context = <#Get the context#>;

   NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
   NSEntityDescription *entity = [NSEntityDescription entityForName:@"  <#Entity name#>"
inManagedObjectContext:context];
  [fetchRequest setEntity:entity];

   NSError *error;
   NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
   if (fetchedObjects == nil) {
     // Handle the error.
    }