StackOverflow2013

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POInit NSManagedObject subclass
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copied!<p>I would like to know if it's possible to init a subclass of NSManagedObject ? I have a class "Actualite" which is a subclass of NSManagedObject and when I want to initialize this class, I get this error : "CoreData: error: Failed to call designated initializer on NSManagedObject class Actualite", and the app crashes after this message "-[Actualite setTitre:]: unrecognized selector sent to instance 0x8433be0"</p> <p>Here is my code :</p> <pre><code>-(void) recupererActualites { listeNouvellesActualites = [[NSMutableArray alloc] init]; // Convert the supplied URL string into a usable URL object NSURL *url = [NSURL URLWithString:FACE06_RSS]; // Create a new rssParser object based on the TouchXML "CXMLDocument" class, this is the // object that actually grabs and processes the RSS data CXMLDocument *rssParser = [[CXMLDocument alloc] initWithContentsOfURL:url encoding:NSUTF8StringEncoding options:0 error:nil]; // Create a new Array object to be used with the looping of the results from the rssParser NSArray *resultNodes = NULL; // Set the resultNodes Array to contain an object for every instance of an node in our RSS feed resultNodes = [rssParser nodesForXPath:@"//item" error:nil]; NSMutableArray* tmp = [[NSMutableArray alloc] init]; for (CXMLElement* resultElement in resultNodes) { // Create a temporary MutableDictionary to store the items fields in, which will eventually end up in blogEntries NSMutableDictionary *blogItem = [[NSMutableDictionary alloc] init]; NSMutableArray* categories = [[NSMutableArray alloc] init]; // Create a counter variable as type "int" int counter; // Loop through the children of the current node for(counter = 0; counter < [resultElement childCount]; counter++) { // Add each field to the blogItem Dictionary with the node name as key and node value as the value if([[[resultElement childAtIndex:counter] name] isEqual:@"category"]) [categories addObject:[[resultElement childAtIndex:counter] stringValue]]; else { if ([[resultElement childAtIndex:counter] stringValue] != nil) [blogItem setObject:[[resultElement childAtIndex:counter] stringValue] forKey:[[resultElement childAtIndex:counter] name]]; else [blogItem setObject:@"" forKey:[[resultElement childAtIndex:counter] name]]; } } Actualite* actu = [[Actualite alloc] init]; [blogItem setObject:categories forKey:@"categories"]; [actu initWithDictionnary:blogItem]; [tmp addObject:actu]; //[actu release]; [categories release]; [blogItem release]; } listeNouvellesActualites = tmp; [rssParser release]; resultNodes = nil; // Stockage des actualités en local [self stockerActualites]; } </code></pre> <p>And the initWithDictionary method set all the attributes of the Actualite class.</p> <p>I also tried </p> <pre><code>Actualite* actu = [[Actualite alloc] initWithEntity:[NSEntityDescription entityForName:@"Actualite" inManagedObjectContext:managedObjectContext] insertIntoManagedObjectContext:managedObjectContext]; </code></pre> <p>and</p> <pre><code>Actualite* actu = (Actualite*)[NSEntityDescription entityForName:@"Actualite" inManagedObjectContext:managedObjectContext]; </code></pre> <p>instead of </p> <pre><code>Actualite* actu = [[Actualite alloc] init]; </code></pre> <p>The errors disappear but the app stops at this point. I don't know what can I do...</p> <p>Is someone already had this problem ?</p> <p>Thanks a lot !</p>

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