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POCore Data One to Many Relationship: unrecognized selector sent to instance
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  1. POCore Data One to Many Relationship: unrecognized selector sent to instance
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    copied!<p>I am having two classes or objects: <code>User</code> and <code>Medicine</code>. Here is my <code>User</code> class:</p> <pre><code>@interface User : NSManagedObject @property (nonatomic, retain) NSString * name; @property (nonatomic, retain) NSSet *medicine; @end @interface User (CoreDataGeneratedAccessors) - (void)addMedicineObject:(Medicine *)value; - (void)removeMedicineObject:(Medicine *)value; - (void)addMedicine:(NSSet *)values; - (void)removeMedicine:(NSSet *)values; @end </code></pre> <p>and then the <code>Medicine</code> class</p> <pre><code>@interface Medicine : NSManagedObject @property (nonatomic, retain) NSString * medName; @property (nonatomic, retain) NSString * medType; @property (nonatomic, retain) Dose *dose; @property (nonatomic, retain) User *user; @end </code></pre> <p>As my interfaces clearly show that user may have multiple medicines. (I am from database background thats why I am interpreting it like this).</p> <p>When I add new object in <code>User</code>, it is easily done, but when I try to add new <code>Medicine</code> for existing object of user, I feel that my Xcode has a deep wish to shoot me at that time (vice versa). </p> <p>Now here is the code that describes what I am doing:</p> <pre><code>Medicine *object = [[self fetchedResultsController] objectAtIndexPath:indexPath]; User *user = [NSEntityDescription insertNewObjectForEntityForName:@"User" inManagedObjectContext:self.managedObjectContext]; if(![self checkUser]) { object.user = user; [user setName:self.userName]; NSLog(@"%@ %@",object, user); self.detailViewController.detailItem = object; } else { Medicine *medicine = [NSEntityDescription insertNewObjectForEntityForName:@"Medicine" inManagedObjectContext:self.managedObjectContext]; user = [self getUser:self.userName]; medicine.medName = object.medName; medicine.medType = object.medType; [medicine setUser:user]; self.detailViewController.detailItem = medicine; } </code></pre> <p>I am having a simple logic: if name entered by user in text field, already exist in DB, then return the <code>User</code> object. Then just add another <code>Medicine</code> record for the same <code>User</code>. Other wise add new <code>User</code> and a <code>Medicine</code> object as well. </p> <p>but I get error at:</p> <pre><code>[medicine setUser:user]; </code></pre> <p>I also tried this one: (as I got it in another question like mine)</p> <pre><code>[user addMedicineObject:medicine]; </code></pre> <p>Now I think that I have to override <code>addMedicineObject</code> method or something else.</p> <p>Oh I forgot the error. I get this error: (the real villain)</p> <pre><code>[__NSArrayM managedObjectContext]: unrecognized selector sent to instance 0x8136bf0 </code></pre> <p>Now any suggestion?</p>
 

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