momdec is a command-line tool for Mac OS X that takes a compiled Core Data model and decompiles it to produce an equivalent xcdatamodel or xcdatamodeld suitable for use in Xcode. The resulting model file can also be used with mogenerator to produce source code files for Core Data entities which have custom subclasses.
momdec (Foo.mom|Foo.momd) [output directory]
The first argument is the full path to a .mom or .momd, and the second is the location where the results should be written. If the second argument is omitted, the current working directory is used. Output files are automatically named based on the inputs.
If the first argument is a .mom, that is, a single managed object model, momdec produces a .xcdatamodel. If the first argument is a .momd (which potentially contains multiple managed object models), momdec produces a .xcdatamodeld containing all models found, as well as a .xccurrentversion file (if appropriate) indicating the current version
momdec Foo.mom /private/tmp/
Creates Foo.xcdatamodel in /private/tmp/
momdec Foo.momd
Creates Foo.xcdatamodeld in the current working directory. This bundle will include all model versions present in the momd and (if appropriate) a .xccurrentversion file.
This project includes a number of categories on Core Data classes which could be used in other projects. The main entry point would be in NSManagedObjectModel+xmlElement.h, which includes the following methods:
- (NSXMLElement *)xmlElement;
Returns an NSXMLElement representing the model
- (NSXMLDocument *)xmlDocument;
Returns a full NSXMLDocument representing the model. This just calls xmlElement, sets that element as the document root, and adds document-level metadata.
+ (NSString *)decompileModelAtPath:(NSString *)momPath;
Decompiles the mom or momd at the specified path and returns the file name of the decompiled model.
Other categories consist of just an xmlElement method, which returns an NSXMLElement representing the receiver's portion of the decompiled model document.
Developed with Mac OS X 10.8.3 and Xcode 4.6.1. May work with older versions of both, but this has not been tested.
MIT-style license, see LICENSE for details.
Min/max values on numeric attributes are currently not supported.
By Tom Harrington, @atomicbird on most social networks.