NSManagedObjectContext+Extensions.swift

NSManagedObjectContext+Extensions.swift

import CoreData

public extension NSManagedObjectContext {
    
    @discardableResult func saveToStore() -> NSError? {
        var currentContext: NSManagedObjectContext? = self
        var error: NSError? = nil
        var hasChanges = true
        
        while let context = currentContext, (error == nil && hasChanges) {
            context.performAndWait {
                hasChanges = context.hasChanges
                
                if hasChanges {
                    do {
                        try context.save()
                    }
                    catch(let saveError) {
                        error = saveError as NSError
                    }
                }
            }
            
            currentContext = context.parent
        }
        
        return error
    }
    
}