Nsfetchedresultscontroller not updating web sexual role play

Posted by / 11-Sep-2016 15:45

You can modify those objects however you like, and unless you actually save those changes, the persistent store remains unaltered.

And by tracking changes, the context is able to provide undo and redo support for you.

A common a programmer can face is when he makes changes on the Managed Object Model.

For example add a new attribute to a entity, and re-run the application with previous stored data. You can prepare a migration, if you already have your application on the App Store.

If you don’t select a valid type it will keep showing an error.

I will change the attribute name to Note that we don’t need to create an attribute for a primary key.

That is one of the responsabilities of Core Data and it is the framework that will create the logic for your entity internally.

Core Data is a framework, provided by Apple, to be used on Applications for i OS and mac OS.The most common mistake, is to start using the Core Data without understanding how its pieces fit together and relate to each other.The Core Data Stack The Core Data stack handles all of the interactions with the external data store and consists of three primary tools: the Managed Object Model, the Persistent Store Coordinator and the Managed Object Context.It may sounds like a lot of pieces to be used, but since you setup all this parts, you will not need to make much changes, and you will be using mostly only the Managed Object Context.The Managed Object Model, describes the schema that you will be using in your application.

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By default, Xcode creates an entity with the name “Entity” and without any attributes.

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