82 lines
2.6 KiB
Swift
82 lines
2.6 KiB
Swift
//
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// Managed.swift
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// CoreDataStack
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//
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// Created by Cirno MainasuK on 2020-8-6.
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//
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import Foundation
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import CoreData
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public protocol Managed: NSFetchRequestResult {
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static var entityName: String { get }
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static var defaultSortDescriptors: [NSSortDescriptor] { get }
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}
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extension Managed {
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public static var defaultSortDescriptors: [NSSortDescriptor] {
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return []
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}
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public static var sortedFetchRequest: NSFetchRequest<Self> {
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let request = NSFetchRequest<Self>(entityName: entityName)
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request.sortDescriptors = defaultSortDescriptors
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return request
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}
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}
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extension NSManagedObjectContext {
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public func insertObject<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("Wrong object type")
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}
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return object
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}
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}
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extension Managed where Self: NSManagedObject {
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public static var entityName: String { return entity().name! }
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}
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extension Managed where Self: NSManagedObject {
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public static func findOrCreate(in context: NSManagedObjectContext, matching predicate: NSPredicate, configure: (Self) -> Void) -> Self {
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guard let object = findOrFetch(in: context, matching: predicate) else {
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let newObject: Self = context.insertObject()
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configure(newObject)
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return newObject
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}
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return object
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}
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public static func findOrFetch(in context: NSManagedObjectContext, matching predicate: NSPredicate) -> Self? {
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guard let object = materializedObject(in: context, matching: predicate) else {
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return fetch(in: context) { request in
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request.predicate = predicate
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request.returnsObjectsAsFaults = false
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request.fetchLimit = 1
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}.first
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}
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return object
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}
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public static func materializedObject(in context: NSManagedObjectContext, matching predicate: NSPredicate) -> Self? {
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for object in context.registeredObjects where !object.isFault {
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guard let result = object as? Self, predicate.evaluate(with: result) else { continue }
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return result
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}
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return nil
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}
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public static func fetch(in context: NSManagedObjectContext, configurationBlock: (NSFetchRequest<Self>) -> Void = { _ in }) -> [Self] {
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let request = NSFetchRequest<Self>(entityName: Self.entityName)
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configurationBlock(request)
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return try! context.fetch(request)
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}
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}
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