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POCore Data Relationship - Add to existing value
 

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  1. POCore Data Relationship - Add to existing value
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    <p>I am trying to set a relationship between inputted core data values. I currently have it set up so when I add the value it creates the relationship in the corresponding entity which I can view in a detail view. </p> <p>What I am trying to achieve is to add the relationship to a existing value within the entity that is held in a string <code>RoutineText</code>. So instead of creating a second identical entry the relationship is added to the new entry. So in the detail view both entries will be viewable.</p> <p><strong>The current situation when inputing the values</strong> <img src="https://i.stack.imgur.com/eTOjD.png" alt="The current situation when inputing the values"></p> <p>So instead of it creating:</p> <p><strong>TestName1</strong> ----> <strong>TestName1Detail</strong></p> <p><strong>TestName1</strong> ----> <strong>TestName2Detail</strong></p> <p>it would create:</p> <p><strong>TestName1</strong> ----> <strong>TestName1Detail</strong> + <strong>TestName2Detail</strong></p> <pre><code> NSManagedObjectContext *context = [self managedObjectContext]; // Create a new device ExcerciseInfo *info = [_fetchedResultsController objectAtIndexPath:indexPath]; Routines *routineEntity = [NSEntityDescription insertNewObjectForEntityForName:@"Routines"inManagedObjectContext:context]; RoutinesDetails *routineEntityDetail = [NSEntityDescription insertNewObjectForEntityForName:@"RoutinesDetails" inManagedObjectContext:context]; //Create Relationship [routineEntity addRoutinedetObject:routineEntityDetail]; //Add attribute values //[routineEntity setValue: RoutineText forKey:@"routinename"]; [routineEntityDetail setValue: info.name forKey:@"image"]; NSError *error = nil; // Save the object to persistent store if (![context save:&amp;error]) { NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]); } </code></pre> <p>I hope that is clear. <img src="https://i.stack.imgur.com/N0qOe.png" alt="enter image description here"></p>
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    1. USSgillon
    1. USSgillon
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    1. COIn what way does a to-many relationship not do exactly what you need?
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      1. USTom Harrington
    2. COI have it set as 1 to many but when I add the new attribute value it creates a second value in the original entity as in the `TestName1` description shown above
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      1. USSgillon
    3. COso i presume my code is wrong as it isn't achieving what i expect
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      1. USSgillon
 

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