Dynamically changing fetch request

Question

Desbrina OP

Created Sep ’22

Replies 1

Boosts 0

Participants 2

I have the below fetch request which I want to be able to dynamically change the setup of.

The request is setup initially as

        sectionIdentifier: \.level,
        sortDescriptors: [NSSortDescriptor(keyPath: \Card.level, ascending: true),
                          NSSortDescriptor(keyPath: \Card.setID, ascending: true),
                          NSSortDescriptor(keyPath: \Card.cardID, ascending: true),
                          NSSortDescriptor(keyPath: \Card.name, ascending: true)],
        animation: .default)
    private var cards: SectionedFetchResults<Int16, Card>

I've got the predicate change working fine, but get errors with the sort descriptors and the section identifier

On setting the sort descriptors I get the error

Cannot convert value of type 'NSSortDescriptor' to expected element type 'Array<SortDescriptor>.ArrayLiteralElement' (aka 'SortDescriptor')

And setting the section identifier I get

Cannot assign value of type 'SectionedFetchResults<String, Card>.Type' to type 'KeyPath<Card, Int16>'

The code I have is below.

                if groupBy == 2 {
                    cards.nsPredicate = nil

                    let sortSetID = NSSortDescriptor(keyPath: \Card.setID, ascending: true)
                    let sortName = NSSortDescriptor(keyPath: \Card.name, ascending: true)
                    cards.sortDescriptors = [sortSetID, sortName] // This errors

                    cards.sectionIdentifier = SectionedFetchResults<String, Card> // This errors
                }

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Answer 1

arroyot24 OP

Jun ’23

Have you already tried this way?

if groupBy == 2 {
       cards.nsPredicate = nil

       let sortSetID = NSSortDescriptor(keyPath: \.setID, ascending: true)
       let sortName = NSSortDescriptor(keyPath: \.name, ascending: true)
       cards.sortDescriptors = [sortSetID, sortName] // This errors

       cards.sectionIdentifier = SectionedFetchResults<String, Card> // This errors
      }

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