core data in a static library for the iPhone

Question

I\'ve built a static library that makes heavy use of the Core Data framework. I can successfully use the library in my external project, but ONLY if I include the .xcdatamod

Answer 1

Note that instead of using xcdatamodel/mom file you can also create your model in code (especially if you have a simple model) and this way you won't need to create an additional bundle for resources. Here is a simple example with one table that contains two attributes:

- (NSManagedObjectModel *)coreDataModel
{
    NSManagedObjectModel *model = [NSManagedObjectModel new];

    NSEntityDescription *eventEntity = [NSEntityDescription new];
    eventEntity.name = @"EventEntity";
    eventEntity.managedObjectClassName = @"EventEntity";

    NSAttributeDescription *dateAttribute = [NSAttributeDescription new];
    dateAttribute.name = @"date";
    dateAttribute.attributeType = NSDateAttributeType;
    dateAttribute.optional = NO;

    NSAttributeDescription *typeAttribute = [NSAttributeDescription new];
    typeAttribute.name = @"type";
    typeAttribute.attributeType = NSStringAttributeType;
    typeAttribute.optional = NO;

    eventEntity.properties = @[dateAttribute, typeAttribute];
    model.entities = @[eventEntity];

    return model;
}

Here is a tutorial about creating model from code: https://www.cocoanetics.com/2012/04/creating-a-coredata-model-in-code/

Also based on this approach I created a small and easy to use library that might fit your needs called LSMiniDB so you can check it also.

Also in my case I had warnings such as "warning: dynamic accessors failed to find @property implementation..." on the console while using properties of NSManagedObject subclasses. I was able to fix that by moving those properties to a class interface/implementation instead of having them in a category in a separate file (currently xcode by default is generating this code splited into separate files ClassName+CoreDataClass and ClassName+CoreDataProperties with a class and a category for each subclass).