Create a way to easily query Entities associated with Mantle Objects

[anayini]

Hey all -

Not sure if this is already addressed by a feature I don't know, but I was wondering if people would think it would be appropriate to have a suite of functions for making it easy to query your Core Data context. I'm thinking something similar to https://github.com/magicalpanda/MagicalRecord.

Generally, I'd like to avoid having NSManagedObject subclasses as well at MTLModel subclasses. Does it seem reasonable to add MagicalRecord type functionality to this library? If so, I'd be willing to work on it.

Thanks!