ModelController+Fetch.swift

extension ModelController {
	
	func total<M: NSManagedObject>(_ type: M.Type) -> Int {
		
		let entityName = String(describing: type)
		let request = NSFetchRequest<M>(entityName: entityName)
		
		do {
			let count = try context.count(for: request)
			return count
		}
		catch {
			print("Error executing total: \(error)")
			return 0
		}
	}
	
	func fetch<M: NSManagedObject>(_ type: M.Type, predicate: NSPredicate?=nil, sort: NSSortDescriptor?=nil) -> [M]? {
		
		var fetched: [M]?
		let entityName = String(describing: type)
		let request = NSFetchRequest<M>(entityName: entityName)
		
		request.predicate = predicate
		request.sortDescriptors = [sort] as? [NSSortDescriptor]
		
		do {
			fetched = try context.fetch(request)
		}
		catch {
			print("Error executing fetch: \(error)")
		}
		return fetched
	}
}