SOLVED: Missing mandatory text data for property '_identifier'

@alecspopa

Feb '24

Hello, I am strugling with a SwiftData error for about a week now and I am out of ideas. Somehow SwiftData/Xcode has decided to generate an _identifier (Z_IDENTIFIER and Z_NORMALIZEDIDENTIFIER in the sqlite db file) and it's complaining that the value for it is empty. Here is the full error:

error: Row (pk = 1) for entity 'Entry' is missing mandatory text data for property '_identifier'
CoreData: error: Row (pk = 1) for entity 'Entry' is missing mandatory text data for property '_identifier'

Here is my full model file for reference:

import Foundation
import SwiftData

@Model
final class Entry {
    var amount: Double
    var currency: Locale.Currency
    var budget: Budget
    var tags: [Tag] = []
    var date: Date
    var note: String

    init(
        amount: Double,
        currency: Locale.Currency = (Locale.current.currency ?? Locale.Currency.init(stringLiteral: "EUR")),
        budget: Budget,
        tags: [Tag] = [],
        date: Date = Date.now,
        note: String = ""
    ) {
        self.amount = amount
        self.currency = currency
        self.budget = budget
        self.tags = tags
        self.date = date
        self.note = note
    }
}

Any help or directions are extreamly appreciated. Thank you.

@alecspopa

Feb '24

If anyone stumbles here for a solution, my problem was: var currency: Locale.Currency works with var currency: String.

@Obelix

Mar 1

@alec writes:

...my problem was: var currency: Locale.Currency works with var currency: String

I think we can interpret this to mean that SwiftData is happy to store Strings for you.
But it has no idea how to store a struct named Locale.Currency.

Apple's documentation shows that Currency is a struct within Locale in Foundation.

// How? How should SwiftData store this struct within its internal data files?
@available(macOS 13, iOS 16, tvOS 16, watchOS 9, *)
    public struct Currency : Hashable, Codable, Sendable, ExpressibleByStringLiteral {

        /// Creates an instance initialized to the given string value.
        ///
        /// - Parameter value: The value of the new instance.
        public init(stringLiteral value: String)

        public var identifier: String
//.... snip.....

Keep Coding!

Thanks for sharing your findings.

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