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POHow to check if a relationship has been established - Core Data
 

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  1. POHow to check if a relationship has been established - Core Data
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    <p>How would you check if a relationship has been established when adding data to core data? Currently I have a <strong>TO MANY</strong> relationship between two of my entities.</p> <p>I am attempting to create a detail view but am struggling and i'm not sure if its due to a relationship not being established or if my issue is with passing the data over to the new view controller.</p> <p><img src="https://i.stack.imgur.com/iXBcS.png" alt="enter image description here"></p> <p>I am adding the the data to the core data entities using the following code. Does this look right when establishing a relationship between the two?</p> <pre><code> ExcerciseInfo *info = [_fetchedResultsController objectAtIndexPath:indexPath]; NSManagedObject *routineEntity = [NSEntityDescription insertNewObjectForEntityForName:@"Routines"inManagedObjectContext:context]; NSManagedObject *routineEntityDetail = [NSEntityDescription insertNewObjectForEntityForName:@"RoutinesDetails" inManagedObjectContext:context]; [[routineEntityDetail valueForKey:@"name"] addObject:routineEntity]; [routineEntity setValue: info.name forKey:@"routinename"]; [routineEntityDetail setValue: info.details.muscle forKey:@"image"]; NSError *error = nil; </code></pre> <p><strong>ERROR INVESTIGATION</strong></p> <p>I used one of the suggested methods but am still getting this fault when i tested the relationship in a <code>NSLog(@"ExTitle *** %@",Ex.routinedet);</code> with routinedet being the <code>@property (nonatomic, retain) NSSet *routinedet;</code> in the core data generated NSObject relationship model:</p> <pre><code>Relationship 'routinedet' fault on managed object (0x749ea50) &lt;Routines: 0x749ea50&gt; (entity: Routines; id: 0x749c630 &lt;x-coredata://C075DDEC-169D-46EC-A4B7-972A04FCED70/Routines/p1&gt; ; data: { routinedet = "&lt;relationship fault: 0x8184a20 'routinedet'&gt;"; routinename = "Leg Crunch"; </code></pre> <p>I have also tested to make sure the segue is working and its is as;</p> <pre><code>self.title = Ex.routinename; RoutinesDetails *info; NSLog(@"Image *** %@",info.image); </code></pre> <p>which shows the title as the correct name but returns image string as null.</p>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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