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annotate Simoleon/Helpers/Persistence.swift @ 171:70f0625bfcf1

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Merge pull request #17 from denniscm190/development open source project committer: GitHub <noreply@github.com>
author Dennis C. M. <dennis@denniscm.com>
date Tue, 12 Oct 2021 16:17:35 +0200
parents Simoleon/Persistence.swift@ecc58b9cd89d Simoleon/Persistence.swift@1940db1ef321
children
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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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17 for _ in 0..<10 {
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18 let favoritePair = FavoritePair(context: viewContext)
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19 favoritePair.baseSymbol = "USD"
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20 favoritePair.quoteSymbol = "EUR"
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21 }
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23 do {
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24 try viewContext.save()
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25 } catch {
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26 /*
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27 Replace this implementation with code to handle the error appropriately.
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28 fatalError() causes the application to generate a crash log and terminate.
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29 You should not use this function in a shipping application, although it may be useful during development.
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30 */
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31 let nsError = error as NSError
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32 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
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33 }
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34 return result
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35 }()
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36
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37 let container: NSPersistentCloudKitContainer
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38
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39 init(inMemory: Bool = false) {
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40 container = NSPersistentCloudKitContainer(name: "Simoleon")
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41 container.viewContext.automaticallyMergesChangesFromParent = true
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42 container.viewContext.mergePolicy = NSMergeByPropertyStoreTrumpMergePolicy
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43 if inMemory {
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44 container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
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45 }
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46 container.loadPersistentStores(completionHandler: { (storeDescription, error) in
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47 if let error = error as NSError? {
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48 /*
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49 Replace this implementation with code to handle the error appropriately.
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50 fatalError() causes the application to generate a crash log and terminate.
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51 You should not use this function in a shipping application, although it may be useful during development.
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52 */
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53
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54 /*
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55 Typical reasons for an error here include:
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56 * The parent directory does not exist, cannot be created, or disallows writing.
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57 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
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58 * The device is out of space.
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59 * The store could not be migrated to the current model version.
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60 Check the error message to determine what the actual problem was.
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61 */
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62 fatalError("Unresolved error \(error), \(error.userInfo)")
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63 }
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64 })
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65 }
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66 }