SwiftUI - Saving ARRAY into NSSet

Question

I'am having trouble with adding an Array [Categories] into my Questions entity relationship

The categories relationship being a "to many" it is an NSSet, so I would like to add my [Categories] array into this NSSet.

I have tried something like this, but nothing gets in.

newQuestion.categories?.addingObjects(from: self.selections)

self.selection being an Array of

Thanks for your help.

Tim

You don't need to do it , because you can save an index with each Categories and later to sort them by the index. — E.Coms
– E.Coms, Commented Feb 18, 2020 at 3:43

Elijah · Accepted Answer · 2025-03-24 06:38:07Z

3

Try the following instead of that line

if let categories = newQuestion.categories {
    newQuestion.categories = categories.addingObjects(from: self.selections)
} else {
    newQuestion.categories = Set(self.selections) as NSSet
}

edited Mar 24 at 6:38

Elijah

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answered Feb 18, 2020 at 6:36

Asperi

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2 Comments

Tim Over a year ago

Works like a charm. I just needed to add: as NSSet but it works fine, Thank you. If I understood correctly the point of this is to extract the NSSet as a Set, into which we'll add the Array?

if let categoriesToSAve = newQuestion.categories {                             newQuestion.categories = categoriesToSAve.addingObjects(from: self.selections) as NSSet                         } else {                             newQuestion.categories = Set(self.selections) as NSSet                         }

Asperi Over a year ago

@Tim, not only, initially it might be nil, so it needs to create it.

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