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    <p>Sascha's answer got me on the right track. Merging a compiled <code>.mom</code> file from a static library into the <code>.mom</code> file from a host project was relatively simple. Here's a trivial example:</p> <ol> <li><p>Create a new XCode Static Library project called <code>MyStaticLibrary</code></p></li> <li><p>Create an .xcdatamodel file in <code>MyStaticLibrary</code> called <code>MyStaticLibraryModels.xcdatamodel</code>, add some <code>Entity</code>s, then generate the headers and implementations. When you build the <code>MyStaticLibrary</code> target, you'll generate a <code>libMyStaticLibrary.a</code> binary file, but it won't include the compiled <code>.mom</code> file. For that we have to create a bundle.</p></li> <li><p>Create a new build target of type <code>Loadable Bundle</code>, found under <code>MacOS X &gt; Cocoa</code>, let's call the new Target <code>MyStaticLibraryModels</code>. </p></li> <li><p>Drag <code>MyStaticLibraryModels.xcdatamodel</code> into the <code>Compile Sources</code> build phase of the <code>MyStaticLibraryModels</code> Target. When you build the <code>MyStaticLibraryModels</code> Target, you will generate a file called <code>MyStaticLibraryModels.bundle</code> and it will contain the compiled <code>NSManagedObjectModel</code> file, <code>MyStaticLibraryModels.mom</code>.</p></li> <li><p>After building both the <code>MyStaticLibrary</code> and <code>MyStaticLibraryModels</code> Targets, drag <code>libMyStaticLibrary.a</code> (along with any associated Model header files) and <code>MyStaticLibraryModels.bundle</code> into your host project, <code>MyAwesomeApp</code>.</p></li> <li><p><code>MyAwesomeApp</code> uses <code>CoreData</code>, has it's own <code>.xcdatamodel</code> file which will get compiled into a .mom file during its own build process. We want to merge this <code>.mom</code> file with the one we imported in <code>MyStaticLibraryModels.bundle</code>. Somewhere in the <code>MyAwesomeApp</code> project, there is a method that returns <code>MyAwesomeApp</code>s <code>NSManagedObjectModel</code>. The Apple generated template for this method looks like this:</p></li> </ol> <p>...</p> <pre><code>- (NSManagedObjectModel *)managedObjectModel { if (managedObjectModel_ != nil) { return managedObjectModel_; } NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"MyAwesomeApp" withExtension:@"momd"]; managedObjectModel_ = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL]; return managedObjectModel_; } </code></pre> <p>We will alter this to merge and return BOTH of our <code>NSManagedObjectModel</code>s, <code>MyAwesomApp</code>s and <code>MyStaticLibraryModels</code>, as a single, combined <code>NSManagedObjectModel</code> like so:</p> <pre><code>- (NSManagedObjectModel *)managedObjectModel { if (managedObjectModel_ != nil) { return managedObjectModel_; } NSMutableArray *allManagedObjectModels = [[NSMutableArray alloc] init]; NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"MyAwesomeApp" withExtension:@"momd"]; NSManagedObjectModel *projectManagedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL]; [allManagedObjectModels addObject:projectManagedObjectModel]; [projectManagedObjectModel release]; NSString *staticLibraryBundlePath = [[NSBundle mainBundle] pathForResource:@"MyStaticLibraryModels" ofType:@"bundle"]; NSURL *staticLibraryMOMURL = [[NSBundle bundleWithPath:staticLibraryBundlePath] URLForResource:@"MyStaticLibraryModels" withExtension:@"mom"]; NSManagedObjectModel *staticLibraryMOM = [[NSManagedObjectModel alloc] initWithContentsOfURL:staticLibraryMOMURL]; [allManagedObjectModels addObject:staticLibraryMOM]; [staticLibraryMOM release]; managedObjectModel_ = [NSManagedObjectModel modelByMergingModels:allManagedObjectModels]; [allManagedObjectModels release]; return managedObjectModel_; } </code></pre> <p>This will return the merged <code>NSManagedObjectModel</code> with the <code>Entity</code>s from both <code>MyAwesomeApp</code> and <code>MyStaticLibrary</code>.</p>
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    1. POcore data in a static library for the iPhone
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    1. COGreat answer, thanks.
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    2. COI am using Xcode4 and following the steps above, I managed to create a bundle with a mom in it, included and used for creating a coordinator and a context. However, when I try to insert a new entity that I am sure it esists, I got the error message "could not locate entity named...". Also, if I try to count all the model entities, I got 0. Any guess ?
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    3. COGood solution. The key thing that @prairedogg glosses over (and I missed) is that: Xcode will CREATE A COPY RESOURCES phase, but Xcode is hardcoded to IGNORE COPY RESOURCES PHASES IN A STATIC LIBRARY TARGET. If you include your bundle in your library - nothing will ever happen. You have to include your bundle into your final app separately (obvious when you think about it - we're working around the bug that Xcode fails to copy things its supposed to copy in the first place ;)).
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