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    <p>You can do this very easily by just implementing the observer to compare. Following is just an example to implement the custom observer to compare</p> <pre><code>@implementation NSArray (KVO) - (void)addObserver:(NSObject *)observer toObjectsAtIndexes:(NSIndexSet *)indexes forKeyPath:(NSString *)keyPath options:(NSKeyValueObservingOptions)options context:(void *)context { NSUInteger idx=[indexes firstIndex]; while(idx!=NSNotFound) { [[self objectAtIndex:idx] addObserver:observer forKeyPath:keyPath options:options context:context]; idx=[indexes indexGreaterThanIndex:idx]; } } - (void)removeObserver:(NSObject *)observer fromObjectsAtIndexes:(NSIndexSet *)indexes forKeyPath:(NSString *)keyPath { NSUInteger idx=[indexes firstIndex]; while(idx!=NSNotFound) { [[self objectAtIndex:idx] removeObserver:observer forKeyPath:keyPath]; idx=[indexes indexGreaterThanIndex:idx]; } } -(void)addObserver:(id)observer forKeyPath:(NSString*)keyPath options:(NSKeyValueObservingOptions)options context:(void*)context; { if([isa instanceMethodForSelector:_cmd]==[NSArray instanceMethodForSelector:_cmd]) NSRaiseException(NSInvalidArgumentException,self,_cmd,@"not supported for key path %@ (observer was %@)", keyPath, observer); else [super addObserver:observer forKeyPath:keyPath options:options context:context]; } -(void)removeObserver:(id)observer forKeyPath:(NSString*)keyPath; { if([isa instanceMethodForSelector:_cmd]==[NSArray instanceMethodForSelector:_cmd]) NSRaiseException(NSInvalidArgumentException,self,_cmd,@"not supported for key path %@ (observer was %@)", keyPath, observer); else [super removeObserver:observer forKeyPath:keyPath]; } @end </code></pre>
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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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