AndrewBennet

import CoreData
import PlaygroundSupport

// Requires a momd called "TestModel" be added to the Resources directory of the playground.
// This can be obtained by creating a model in an iOS app, building, and copying the momd directory
// from the resulting Products directory into this playground's Resources directory.

// The model has a single entity called "Entity" with a single optional string attribute called "testAttribute".
// There are no relationships in the model.

AndrewBennet

import CoreData
import PlaygroundSupport

extension NSManagedObjectContext {
    func childContext(concurrencyType: NSManagedObjectContextConcurrencyType = .mainQueueConcurrencyType) -> NSManagedObjectContext {
        let childContext = NSManagedObjectContext(concurrencyType: concurrencyType)
        childContext.parent = self
        return childContext
    }
}

AndrewBennet

import XCPlayground
import CSVImporter

class Row {
    let cell1: String
    let cell2: String
    let cell3: String
    init(cell1: String, cell2: String, cell3: String){
        self.cell1 = cell1
        self.cell2 = cell2

AndrewBennet

/**
 A CompoundFetchedResultsController is a wrapper of a number of inner NSFetchedResultsControllers.
 The wrapper flattens the sections produced by the inner controllers, behaving as if all sections
 were fetched by a single controller. Additionally, change notifications are mapped before being
 passed to the optional NSFetchedResultsControllerDelegate property, so that the section indices
 in the notifications reflect the flattened section indicies.
 
 Example use case: a table where sections should be ordered in mutually opposing ways. E.g., if
 section 1 should be ordered by propery A ascending, but section 2 should be ordered by property A
 descending. In this case, two controllers can be created - one ordering ascending, the other de-