Databases
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PO
 

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    <p>I think delegation is the most appropriate method for this task. You should create a new protocol called <code>SubjectViewControllerDelegate</code> and add some methods like:</p> <pre><code>- (void)subjectViewController:(SubjectViewController*)controller didEditSubject:(Subject*)subject; - (void)subjectViewController:(SubjectViewController*)controller didDeleteSubject:(Subject*)subject; </code></pre> <p>SubjectViewController has a delegate property to keep weak reference to its delegate. It calls the delegate methods whenever a data is deleted or edited.</p> <p>CategoryViewController implements this protocol and sets itself as the delegate of SubjectViewController instance before pushing it to the navigation controller. In this methods you can either refresh the all table, or just update the rows that are changed.</p> <p><strong>UPDATE:</strong></p> <p>Assuming that you have only one section in CategoryViewController and keep the subjects in an <code>NSMutableArray</code>, you can use the codes similar to below for updating the relevant part of the table view.</p> <pre><code>- (void)subjectViewController:(SubjectViewController*)controller didEditSubject:(Subject*)subject{ NSInteger row; NSIndexPath* indexPath; NSArray* indexPaths; row = [self.subjects indexOfObject:subject]; indexPath = [NSIndexPath indexPathForRow:row inSection:0]; indexPaths = [NSArray arrayWithObject:indexPath]; [self.tableView reloadRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone]; } - (void)subjectViewController:(SubjectViewController*)controller didDeleteSubject:(Subject*)subject{ NSInteger row; NSIndexPath* indexPath; NSArray* indexPaths; row = [self.subjects indexOfObject:subject]; indexPath = [NSIndexPath indexPathForRow:row inSection:0]; indexPaths = [NSArray arrayWithObject:indexPath]; [self.subjects removeObjectAtIndex:row]; [self.tableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone]; } </code></pre>
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    1. COInteresting. I already have a QuotesAppDelegate which I thought was the overall delegate. I need to read up more on delegates as I am not tracking. Should I have a separate delegate for the SubjectViewController or could I use the same one? Could you give me an example of how I would call the delegate and update the changed row.
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    2. COQuotesAppDelegate is your application delegate and should not be used for this task. You can read more about delegation [here](https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/CocoaFundamentals/CommunicatingWithObjects/CommunicateWithObjects.html#//apple_ref/doc/uid/TP40002974-CH7-SW18). I have updated my answer and added some code to show you how to update the changed row of the table view.
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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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