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52 lines
1.5 KiB
52 lines
1.5 KiB
//
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// NSManagedContext+Extensions.swift
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// LeCountdown
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//
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// Created by Laurent Morvillier on 24/01/2023.
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//
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import Foundation
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import CoreData
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extension NSManagedObjectContext {
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func object(stringId: String) -> NSManagedObject? {
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guard let url = URL(string: stringId) else { return nil }
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guard let objectId = PersistenceController.shared.container.persistentStoreCoordinator.managedObjectID(forURIRepresentation: url) else { return nil }
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return self.object(with: objectId)
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}
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func distinct(entityName: String, attributes: [String]) throws -> [Any] {
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let request = NSFetchRequest<NSFetchRequestResult>(entityName: entityName)
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request.entity = NSEntityDescription.entity(forEntityName: entityName, in: self)
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request.returnsDistinctResults = true
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request.resultType = .dictionaryResultType
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if let entity = request.entity {
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let entityProperties = entity.propertiesByName
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var properties = [NSPropertyDescription]()
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for attribute in attributes {
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if let entityDescription = entityProperties[attribute] {
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properties.append(entityDescription)
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}
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}
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request.propertiesToFetch = properties
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}
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return try self.fetch(request)
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}
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}
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extension NSManagedObject {
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var isTemporary: Bool {
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return self.objectID.isTemporaryID
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}
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var stringId: String {
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return self.objectID.uriRepresentation().absoluteString
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}
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}
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