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Automatic creation and management of the Core Data stack (#7)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
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| import Foundation | ||
| import CoreData | ||
| import NotificationCenter | ||
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| public protocol CoreDataContainer { | ||
| /// Thread safety is up to you | ||
| var viewContext: NSManagedObjectContext { get } | ||
| var backgroundContext: NSManagedObjectContext { get } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
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| import Foundation | ||
| import CoreData | ||
| import NotificationCenter | ||
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| public class CoreDataPlusStore: CoreDataContainer { | ||
| public static let shared = CoreDataPlusStore() | ||
| private init() { | ||
| modelName = guessModelName() | ||
| } | ||
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| private var didConfigure = false | ||
| public var assignedModelName: String? { | ||
| modelName | ||
| } | ||
| internal var modelName: String! | ||
| // internal var overriddenPersistentContainer: NSPersistentContainer? | ||
| // internal var overriddenPersistentCloudKitContainer: NSPersistentCloudKitContainer? | ||
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| /// Use this | ||
| public func configure() { | ||
| let persist = CoreDataPlusStore.shared | ||
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| guard persist.didConfigure == false else { | ||
| NSLog("Already configured. Ignorning.") | ||
| return | ||
| } | ||
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| persist.modelName = guessModelName() | ||
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| CoreDataPlusLogger.shared.log("Enabled persistence for data model '\(String(describing: persist.modelName))' (auto-detected)") | ||
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| persist.didConfigure = true | ||
| } | ||
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| /// If you have a model name mistmatch: | ||
| public func configure(modelName overrideName: String?) { | ||
| let persist = CoreDataPlusStore.shared | ||
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| guard persist.didConfigure == false else { | ||
| NSLog("Already configured. Ignorning.") | ||
| return | ||
| } | ||
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| persist.modelName = overrideName | ||
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| CoreDataPlusLogger.shared.log("Enabled persistence for data model '\(String(describing: persist.modelName))'") | ||
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| persist.didConfigure = true | ||
| } | ||
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| // /// To use your own NSPersistentContainer with our automatic context management: | ||
| // /// For example, to set various properties like change tracking. | ||
| // public func configure(container: NSPersistentContainer) { | ||
| // let persist = CoreDataPlusStore.shared | ||
| // | ||
| // guard persist.didConfigure == false else { return } | ||
| // | ||
| // persist.overriddenPersistentContainer = container | ||
| // | ||
| // CoreDataPlusLogger.shared.log("Enabled persistence using manual NSPersistentContainer") | ||
| // | ||
| // persist.didConfigure = true | ||
| // } | ||
| // /// To use your own NSPersistentCloudKitContainer with our automatic context management: | ||
| // /// For example, to set various properties like version history | ||
| // public func configure(cloudKitContainer: NSPersistentCloudKitContainer?) { | ||
| // | ||
| // } | ||
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| /// To use your own NSManagedObjectContext management, don't use CoreDataPlusStore. Instead pass your contexts to each call. | ||
| public func configure(viewContext: NSManagedObjectContext, backgroundContext: NSManagedObjectContext?) { } | ||
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| /// Read-only context for use on main thread. | ||
| public lazy var viewContext: NSManagedObjectContext = { | ||
| let c = persistentContainer.viewContext | ||
| c.automaticallyMergesChangesFromParent = true | ||
| return c | ||
| }() | ||
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| /// Single background context for all writes, and background data loading. | ||
| public lazy var backgroundContext: NSManagedObjectContext = { | ||
| let newbackgroundContext = persistentContainer.newBackgroundContext() | ||
| newbackgroundContext.automaticallyMergesChangesFromParent = true | ||
| newbackgroundContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy | ||
| return newbackgroundContext | ||
| }() | ||
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| private func guessModelName() -> String? { | ||
| let momdUrls = Bundle.main.urls(forResourcesWithExtension: "momd", subdirectory: nil) ?? [] | ||
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| guard momdUrls.count == 1 else { return nil } | ||
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| return momdUrls.first?.lastPathComponent.replacingOccurrences(of: ".momd", with: "") | ||
| } | ||
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| lazy var persistentContainer: NSPersistentContainer = { | ||
| let container = NSPersistentContainer(name: modelName) | ||
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| container.loadPersistentStores(completionHandler: { (storeDescription, error) in | ||
| if let error = error as NSError? { | ||
| // Replace this implementation with code to handle the error appropriately. | ||
| // 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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| /* | ||
| Typical reasons for an error here include: | ||
| * The parent directory does not exist, cannot be created, or disallows writing. | ||
| * The persistent store is not accessible, due to permissions or data protection when the device is locked. | ||
| * The device is out of space. | ||
| * The store could not be migrated to the current model version. | ||
| Check the error message to determine what the actual problem was. | ||
| */ | ||
| fatalError("Unresolved error \(error), \(error.userInfo)") | ||
| } | ||
| }) | ||
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| return container | ||
| }() | ||
| } | ||
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