Databases
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    <p>A plist by definition contains any of the following types: array, dictionary, string, real, integer, boolean, date and data). If you are using a true plist you can instantiate the objects it contains with a single line of code. See the NSPropertyListSerialization method:</p> <p><code>propertyListFromData:mutabilityOption:format:errorDescription</code></p> <p>Binary plists, can contain any objects and can be written and read using the NSKeyedArchiver and NSKeyedUnarchiver. To use these you must adopt the NSCoding protocol here is an example of these methods in an object that inherits from NSObject and has two properties: userId and userEmail.</p> <pre><code> + (void) initialize { [self setVersion:1]; // increment when you object format changes (add or remove properties) } - (id) initWithCoder:(NSCoder *)coder { if (self = [super init]) { NSInteger storedClassVersion = [coder versionForClassName:NSStringFromClass([self class])]; self.userId = [coder decodeObjectForKey:@"userid"]; self.userEmail = [coder decodeObjectForKey:@"useremail"]; if (storedClassVersion &gt; 1) { // Use this block to conditionally read properties in versions greater than 1 } } return self; } - (void) encodeWithCoder:(NSCoder *)coder { [coder encodeObject:self.userId forKey:@"userid"]; [coder encodeObject:self.userEmail forKey:@"useremail"]; } </code></pre> <p>When archiving I find it is useful to wrap up all of the objects to be persisted in an NSDictionary. This allows you to find individual objects by key when unarchiving. NSDictionary supports the NSCoding protocol making it really easy to do so.</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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