Cocoa-Touch, Core Data: How do I delete all objects for an entity?

I have an app, using Core Data with a SQLite store.

At some point I'd like to remove all objects for a few entities. There may be close to a thousand objects.

From what I can tell via google and the official docs, the only way to delete objects is to [managedObject开发者_开发问答Context deleteObject:(Entity *)] for every object. But this means that I must first fetch all objects.

The data store is just sqlite, is there no way to simply pass a TRUNCATE TABLE ZENTITY; to it?

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If you relate your objects to a parent entity simply delete the parent. If your parents delete rule is set to 'cascade' all of those (1k) children will be removed as well.

John

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The issue is that CoreData isn't just a SQLite wrapper. It's an object graph management solution and it stores cached versions of your object in memory in addition to other stuff. As far as I know to remove all instances of a given managed object you'll have to fetch them and then delete each. This isn't to say that this functionality shouldn't exist, because it probably should.

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Have you actually tried it and found it to be a performance issue? If so, then you could provide some information showing that, and more importantly file a bug report on it. If not, then why are you bothering to ask?

It's not as simple as doing a TRUNCATE TABLE ZENTITY; since Core Data must also apply the delete rule for each object (among other actions), which means doing a fetch. So they may as well let you make the fetch and then pass the results into the context one-by-one.