CODEWITHSUNDEEP
iosiphonedatabasecore-datamany-to-many
nickthedude
nickthedude

Reputation: 4973

Core Data: How do I add additional entities to an existing many-to-many relationship

If I have 'Category' and 'Asset' entities and they have an inverse many-to-many relationship called 'assets' and 'categories' respectively, how would I add an additional entity instance of either Category or Asset into the existing relationship set?

Do I get the existing set and turn it into a mutableSet add the new entity and write it back to the db?

That doesn't seem like a great way, i guess i need the equivalent to addObject: in my Managed Object Entity class.

Any help would be appreciated.

Thank You.

Upvotes: 0

Views: 95

Answers (1)

Martin R
Martin R

Reputation: 539685

If you have created the NSManagedObject subclass files "Category.h/.m" and "Asset.h/.m" then you can simply add an asset to a category with

[category addAssetsObject:asset];

or add a category to an asset with

[asset addCategoriesObject:category];

Upvotes: 1

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