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POCore Data saving problem: can't update transformable attribute (NSArray)
 

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  1. POCore Data saving problem: can't update transformable attribute (NSArray)
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    <p>I have a strange problem in my Core Data app.</p> <p>I have three entities in my app, but today I found a problem with one of them. My problematic entity is called <code>Invoice</code> and it has many attributes, including <code>Products</code>. It's encoded NSArray of NSDictionaries (via default NSValueTransformer).</p> <p>Everything works fine - i create my invoice, its client, its products, etc. Everything works.</p> <p><strong>But</strong>, when I choose my invoice from a list and then try to edit its products and click 'Save' button, my save works only until my app gets terminated.</p> <p>The problem is only with my <code>products</code> array - the rest (e.g. payment date, client etc.) saves.</p> <hr> <p><strong>What am I doing</strong></p> <p>I pass my <code>Invoice</code> object via</p> <pre><code>NSManagedObject *inv = [self.fetchedResultsController objectAtIndexPath:indexPath]; invoiceEditor.invoice = inv; </code></pre> <p>And save my data (in my <code>InvoiceEditor</code> VC):</p> <pre><code>[self.invoice setValue:client forKey:@"Client"] // NSDictionary; [self.invoice setValue:products forKey:@"Products"] // NSArray of NSDictionaries; [self.invoice setValue:pmDate forKey:@"PaymentDate"] // NSDate; // other attributes NSManagedObjectContext *context = self.invoice.managedObjectContext; NSError *error = nil; if (![context save:&amp;error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } </code></pre> <p>Everythings saves until being terminated: client, products, dates. But only products are 'reseted' after termination.</p> <p>Anybody?</p>
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    1. COClarification: What do you mean by " products are 'reseted'"? Do you mean that the product attribute is not saved? Do you mean it reverts to a previous value? In other words, what do ***expect*** to see for the `products` attribute after restart and what do you ***actually*** see?
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    2. COAny particular reason you are not using a entity and a relationship instead of a bunch of NSDictionary objects inside a NSArray? That is a very cumbersome and (most likely) slow setup.
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    3. CO1. I mean that products attribute is saved but after my app gets terminated it returns to previous value. 2. I don,t use relationship because I need the products all the time, even if user has deleted them. I have an entity called 'Product' but in my 'Invoice' I'm storing its copy.
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