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POUsing a NSFetchedResultsController with an NSManagedObject and fetched properties
 

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  1. POUsing a NSFetchedResultsController with an NSManagedObject and fetched properties
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    <p>I have a database of <code>Card</code>s and <code>Printing</code>s that I have in one store (reference data) and my user's data of <code>Container</code>s and <code>CardInstance</code>s in another store (as Apple suggests). Each user's card is a table <code>CardInstance</code> that contains a specific <code>printingID</code> that corresponds with a specific printing of a card. I'm trying to use a <code>NSFetchedResultsController</code> to filter the values of the cards so that it can manage the groupings and stuff using reusable code.</p> <p>Again, here's the basic overview of the tables: <code>Card</code> (which has <code>nameNormalized</code> and <code>alphaNormalized</code> and <code>typeNormalized</code> properties that I want to filter and group on in the Fetched Results Controller). <code>Printing</code> (which has a <code>card</code> relationship and a specific <code>printingID</code>) <code>CardInstance</code> (which has a <code>container</code> relationship, a <code>printingID</code> property, and a <code>printingFetch</code> fetched property on <code>Printing</code> with predicate: <code>printingID = $FETCH_SOURCE.printingID</code>). <code>Container</code> (which has a to-many relationship of <code>CardInstance</code>s).</p> <p>Given a <code>Container</code>, I'm wanting to use a NSFetchedResultsController so that I can change the sort and groupings between name and type sections. So I have a fetchRequest where I've set the entity type to <code>CardInstance</code> and one predicate to <code>container = %@</code>, the given container. </p> <p>1) How do I set the sort descriptors so that I can sort on <code>printingFetch.card.nameNormalized</code> or on <code>printingFetch.card.typeNormalized</code>?</p> <p>2) How do I filter the results if I want to find all cards containing the word @"the"? I was thinking something along the lines of <code>printingFetch.card.nameNormalized contains %@</code>, @"the", but that just results in a crash.</p> <p>I realize I could do this all manually, but if the container ends up containing a lot of cards, that may be way too slow and I'd like to not have to re-write the sectioning and grouping code that <code>NSFetchedResultsController</code> should automatically do for me.</p>
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    1. USGujamin
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    1. COWhy are these entities reside in different stores? apple specifically mentioned that it is not possible to create relationships across stores (only maintain them manually).
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    2. COBecause the cards and printings are cached/generated reference data and the card instances and collections are user data. Apple specifically says to do this and not keep recreatable data in the user store.
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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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