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POMultiple Unrelated Entities in one Core Data Model
 

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  1. POMultiple Unrelated Entities in one Core Data Model
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    <p>I want to have the equivalent of two completely unrelated tables in my database, and for this I have defined two different entities in my Core Data model.</p> <p>Further to this, I have a different ViewController making use of each of these entities and therefore I'm initializing two different fetchedResultsController (one in each ViewController) in this manner:</p> <pre><code>// Create the fetch request for the entity. NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; // Edit the entity name as appropriate. NSEntityDescription *entity = [NSEntityDescription entityForName:@"Event" inManagedObjectContext:managedObjectContext]; [fetchRequest setEntity:entity]; </code></pre> <p>I should note that the MOM is only initialized only once in the AppDelegate based on the XCode template.</p> <p>It all worked fine when I only had one ViewController and a single entity in the model, however even though I have the 2nd entity defined in the model I cannot get the 2nd ViewController to initialize the fetchedResultsController (again based on the XCode template). I always get the following error:</p> <pre><code>2010-02-11 22:02:55.078 JournalTool[3094:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'EventTag'' </code></pre> <p>I'm probably missing something basic and doing something really stupid, but any help here would be appreciated.</p> <p>Thanks,<br> Paul</p>
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    1. COAre you using the same managed object context for both fetches? (you should be)
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    2. COYes, the managed object model, and the managed object context are both initialized once in the AppDelegate and I'm simply passing that same context through into both ViewControllers, e.g. [tagsViewController setManagedObjectContext:self.managedObjectContext];
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    3. COThis might sound silly, but have you reset the simulator (assuming you're not running on the device) or deleted the app from it since adding the second entity to the model? Maybe it still has the old model.
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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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