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annotate Simoleon/Persistence.swift @ 47:75c1a05176f6

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Refactor code
author Dennis Concepción Martín <dennisconcepcionmartin@gmail.com>
date Mon, 26 Jul 2021 20:08:20 +0100
parents 933d9ab04374
children b0bce2c8e4a9
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1 //
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2 // Persistence.swift
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3 // Simoleon
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4 //
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5 // Created by Dennis Concepción Martín on 08/07/2021.
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6 //
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7
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8 import CoreData
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9
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10 struct PersistenceController {
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11 static let shared = PersistenceController()
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13 static var preview: PersistenceController = {
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14 let result = PersistenceController(inMemory: true)
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15 let viewContext = result.container.viewContext
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16 for _ in 0..<10 {
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17 let newItem = Item(context: viewContext)
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18 newItem.timestamp = Date()
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19 }
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21 for _ in 0..<10 {
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22 let favourite = Favourite(context: viewContext)
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23 favourite.currencyPair = "USD/GBP"
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24 }
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25 do {
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26 try viewContext.save()
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27 } catch {
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28 // Replace this implementation with code to handle the error appropriately.
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29 // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
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30 let nsError = error as NSError
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31 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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32 }
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33 return result
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34 }()
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35
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36 let container: NSPersistentCloudKitContainer
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37
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38 init(inMemory: Bool = false) {
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39 container = NSPersistentCloudKitContainer(name: "Simoleon")
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40 container.viewContext.automaticallyMergesChangesFromParent = true
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41 container.viewContext.mergePolicy = NSMergeByPropertyStoreTrumpMergePolicy
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42 if inMemory {
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43 container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
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44 }
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45 container.loadPersistentStores(completionHandler: { (storeDescription, error) in
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46 if let error = error as NSError? {
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47 // Replace this implementation with code to handle the error appropriately.
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48 // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
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49
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50 /*
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51 Typical reasons for an error here include:
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52 * The parent directory does not exist, cannot be created, or disallows writing.
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53 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
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54 * The device is out of space.
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55 * The store could not be migrated to the current model version.
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56 Check the error message to determine what the actual problem was.
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57 */
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58 fatalError("Unresolved error \(error), \(error.userInfo)")
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59 }
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60 })
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61 }
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62 }