SwiftData Predicates and .contains(where: )

Question

CMDdev OP

Created Feb ’24

Replies 3

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Views 1k

Participants 3

Hi,

I have the following predicate used in a SwiftData Query:

#Predicate<Item> {
    searchText.isEmpty || $0.myarray.contains(where: {
        $0.text.localizedStandardContains(searchText)
    })
})

Even though this compiles, I get the unsupportedKeyPath error in the logs:

Query encountered an error: SwiftData.SwiftDataError(_error: SwiftData.SwiftDataError._Error.unsupportedKeyPath)

I thought I could use .contains(where:) inside predicates, but this doesn't work. What could be the problem?

Item.myarray is an array of a Codable struct type, and searchText is a String.

Answered by MartinP7r in 798652022

I'm not exactly sure if this is the same issue, but from what I understand, collections, enums and other non-trivial value types are stored as binary data in CloudKit (you can check in CloudKit console) and their contents therefore can't be queried with a predicate.

It's also mentioned here: https://www.hackingwithswift.com/quick-start/swiftdata/using-structs-and-enums-in-swiftdata-models

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Answer 1

Claude31 OP

Feb ’24

Did you try to explicit the second $0 ?

searchText.isEmpty || $0.myarray.contains { item in item.text.localizedStandardContains(searchText) }

0

Answer 2

CMDdev OP

Feb ’24

@Claude31 Yes, I tried that. I also thought it could be the $0 but it still doesn't work :(

I do have a workaround that I might implement (moving the text in the parent class), but I'm also wondering what could be the problem here.

Could it be related to Item.myarray's type (an array of structs that conform to Codable)?

0

Answer 3

MartinP7r OP

Aug ’24

Accepted Answer

I'm not exactly sure if this is the same issue, but from what I understand, collections, enums and other non-trivial value types are stored as binary data in CloudKit (you can check in CloudKit console) and their contents therefore can't be queried with a predicate.

It's also mentioned here: https://www.hackingwithswift.com/quick-start/swiftdata/using-structs-and-enums-in-swiftdata-models

1