CoreData.Fetch

gistfile1.swift

    func listEntities(managedContext: NSManagedObjectContext, entityName: String, groupBy: Array<String>)->NSArray{
        
        var error: NSError?
        var results : NSArray = NSArray()
        
        let fetchRequest = NSFetchRequest(entityName: entityName)
        if groupBy.count > 0{
            fetchRequest.propertiesToGroupBy = groupBy
        }
        if let results = managedContext.executeFetchRequest(fetchRequest, error: &error) {
            return results
        }
        
        return results
    }