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    <p>I found this in the docs (<a href="http://developer.apple.com/mac/library/documentation/cocoa/conceptual/ModelObjects/Articles/moIntegrating.html#//apple_ref/doc/uid/TP40002138-SW6" rel="nofollow noreferrer" title="KVC Compliance - Dependent Values">KVC Compliance - Dependent Values</a>): </p> <blockquote> <p>Important: Note that you cannot set up dependencies on to-many relationships. For example, suppose you have an Order object with a to-many relationship (orderItems) to a collection of OrderItem objects, and OrderItem objects have a price attribute. You might want the Order object have a totalPrice attribute that is dependent upon the prices of all the OrderItem objects in the relationship. You can not do this by implementing keyPathsForValuesAffectingValueForKey: and returning orderItems.price as the keypath for totalPrice. You must observe the price attribute of each of the OrderItem objects in the orderItems collection and respond to changes in their values by updating totalPrice yourself.</p> </blockquote> <p><strong>So you cannot rely on KVO dependencies or notifications when there is a to-many relationship in the keypath</strong>. This applies to my array of tags, so I've added some code to patch this broken link.</p> <p>When I add a project to the "projects" array:</p> <pre><code>[newProject addObserver:self forKeyPath:@"tags" options:NSKeyValueObservingOptionNew context:nil]; </code></pre> <p>And the important part:</p> <pre><code>-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if ([object isKindOfClass:[CProject class]] &amp;&amp; [keyPath isEqualToString:@"tags"]) { [self willChangeValueForKey:@"projects"]; [self didChangeValueForKey:@"projects"]; } } </code></pre> <p>And to cleanup, when I remove a project:</p> <pre><code>[project removeObserver:self forKeyPath:@"tags"]; </code></pre> <p>Not sure if this is the best solution, but it's keeping my list updated.</p>
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Guidance
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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