nsmanagedobject | 易学教程

How can I track/observe all changes within a subgraph?

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问题 I have a NSManagedObjectContext in which I have a number of subclasses of NSManagedObjects such that some are containers for others. What I'd like to do is watch a top-level object to be notified of any changes to any of its properties, associations, or the properties/associations of any of the objects it contains. Using the context's 'hasChanges' doesn't give me enough granularity. The objects 'isUpdated' method only applies to the given object (and not anything in its associations). Is

Can someone explain this @synthesize syntax?

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I'm following the example Navigation View template with core data in the latest iOS SDK. In the rootViewController.m file I see this in the @synthesize line: @synthesize fetchedResultsController=fetchedResultsController_, managedObjectContext=managedObjectContext_; Where the header file is: @private NSFetchedResultsController *fetchedResultsController_; NSManagedObjectContext *managedObjectContext_; } @property (nonatomic, retain) NSManagedObjectContext *managedObjectContext; @property (nonatomic, retain) NSFetchedResultsController *fetchedResultsController; Does this mean that they are both

Passing generic Class as argument to function in swift

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问题 Below is my method in which there is fetch I make on a Managed object Class Appointment. I need to use same function for other similar managed object Classes. How do I pass different "Class" as parameter every time as I need. And also use it to fetch as I have currently "Appointment" Class. I might need to use Generics may be. Dont know how though. func getAppointmentArray(aPredicate : String , aModel : Any) -> [Any] { var apptArr = [Any]() let fetchRequest = NSFetchRequest<Appointment>

Using Swift protocols with generics

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I have a simple example that seems like it should work: import CoreData @objc protocol CoreDataModel { @optional class func entityName() -> String } class AbstractModel: NSManagedObject, CoreDataModel { class func create<T : CoreDataModel>(context:NSManagedObjectContext) -> T { var name = T.entityName?() var object = NSEntityDescription.insertNewObjectForEntityForName(name, inManagedObjectContext: context) as T return object } } So we have a class called AbstractModel which conforms to the protocol CoreDataModel , and CoreDataModel defines an optional class method called entityName . However,

Cross-model relationships in NSManagedObjectModel from merged models?

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Is it possible to model relationships between entities that are defined in separate NSManagedObjectModels if the entities are always used within an NSManagedObjectModel that is created by merging the relevant models? For example, say model 1 defines an entity Foo with relationship (one-to-one) toBar and that model 2 defines an entity Bar with a relationship (one-to-one) toFoo . I will build a CoreData stack using -[NSManagedObjectModel mergedModelFromModels] , merging model 1 and model 2. Is there any way to define these relationships either in the data modeler or programatically so that they

What are the functional differences between Coredata's CodeGen 'manual/none + create NSManagedObject subclass' vs. 'category/extension'

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问题 I've read Subclassing NSManagedObject with swift 3 and Xcode 8 beta and read this great tutorial. Still have questions on some points. The similarities are: I can customize both classes however I like. I can add new attributes or remove or rename attributes. ie for category/extension it will get updated upon a new build (in the derived data), and in case of manual/none it will leave the class file intact and update the extension in the file navigation ie I won't end up with a duplicate file.

Subclassing NSManagedObject with swift 3 and Xcode 8 beta

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I've began to try use Core data with swift 3 and Xcode 8 beta. When I try to generate NSManagedObject subclasses from core data model and Create NSManagedObject subclass… option in Editor menu, Xcode 8 beta generates three files one of them is _COREDATA_DATAMODELNAME_ +CoreDataModel.swift with the following content: import Foundation import CoreData ___COREDATA_DATAMODEL_MANAGEDOBJECTCLASSES_IMPLEMENTATIONS___ In addition, the content of this file shows two warnings: Expressions are not allowed at the top level. Use of unresolved identifier '___COREDATA_DATAMODEL_MANAGEDOBJECTCLASSES

invalid redeclaration in auto code generate NSManagedObject Subclass Swift 3

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Using Version 8.1 of Xcode. Create an entity named "MapRegionObject" in .xcdatamodeld file. Using auto code generator, click Editor on the navigation bar -> create NSManagedOject Subclass... Got two files : MapRegionObject+CoreDataClass.swift and MapRegionObject+CoreDataProperties Errors in two files showing in the screenshot: MapRegionObject+CoreDataClass.swift MapRegionObject+CoreDataProperties Please help me fix this bugs, thank you so much! Kamillpg In Xcode 8.1, before using the auto code generator, you must select the entity in your data model: Then go to the Data Model Inspector tab:

Generating Swift models from Core Data entities

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Update for Xcode 8: In Xcode 8, one needs to go to the Core Data Model Editor and Show the File Inspector. Near the bottom is an option for code generation. Select Swift. Edit : I found the solution to generate a Swift model from Core Data entity: On Xcode: Editor > Create NSManagedOjbect > Click button "Next" > Click button "Next" > Select "Swift" Langage > Click button "Create" I tried Swift langage by creating a new Swift project on Xcode 6 beta using Core Data. When I generate my models from my Core Data's entities, Xcode creates Objective-C models. Is there a way to generate Swift model

Custom initializer for an NSManagedObject

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问题 According to the docs: You should not override init. You are discouraged from overriding initWithEntity:insertIntoManagedObjectContext: and you should instead use awakeFromInsert or awakeFromFetch. This is fine if all I want to do is set some attribute to the current date or similar, but what if I want to send in another object and set attributes based on its information? For example, in an NSManagedObject subclass called 'Item', I want an initFromOtherThing:(Thing *)thing, in which the item