50 lines
1.3 KiB
Swift
50 lines
1.3 KiB
Swift
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//
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// NSManagedObjectContext.swift
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// CoreDataStack
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//
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// Created by Cirno MainasuK on 2020-8-10.
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//
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import os
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import Foundation
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import Combine
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import CoreData
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extension NSManagedObjectContext {
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public func insert<T: NSManagedObject>() -> T where T: Managed {
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guard let object = NSEntityDescription.insertNewObject(forEntityName: T.entityName, into: self) as? T else {
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fatalError("cannot insert object: \(T.self)")
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}
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return object
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}
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public func saveOrRollback() throws {
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do {
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guard hasChanges else {
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return
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}
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try save()
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} catch {
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rollback()
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os_log("%{public}s[%{public}ld], %{public}s: %s", ((#file as NSString).lastPathComponent), #line, #function, error.localizedDescription)
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throw error
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}
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}
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public func performChanges(block: @escaping () -> Void) -> Future<Result<Void, Error>, Never> {
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Future { promise in
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self.perform {
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block()
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do {
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try self.saveOrRollback()
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promise(.success(Result.success(())))
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} catch {
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promise(.success(Result.failure(error)))
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}
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}
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}
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}
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}
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