Usage Tagged (safe) types in CoreData

[inekipelov]

Hi @helje5
Thank you for quick solve previous issue

I use Tagged
Tagged structure also have Codable protocol realisation like RawValue type
Example

struct AccessTokenTagged {}
typealias AccessToken = Tagged<AccessTokenTagged, String>

@Model
final class StoredAccess: NSManagedObject {
    var token: AccessToken
    ...
}

When compilation as result we can see

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unacceptable type of value for attribute: property = "token"; desired type = NSString; given type = _TtGC13ManagedModels10CodableBoxGV6Tagged6TaggedV5WE_UC17AccessTokenTaggedSS__; value = <_TtGC13ManagedModels10CodableBoxGV6Tagged6TaggedV5WE_UC17AccessTokenTaggedSS__: 0x600000336460>.'

It's strange, because ManagedModels use CodableBox for wrap Codable types. How we can solve it issue in current realisation?

[helje5]

Can't look into that right away, but RawValue properties are not supposed to be treated as Codable's. Instead they should just store as their rawValue (e.g. String in this case).

[inekipelov]

@helje5

Can't look into that right away, but RawValue properties are not supposed to be treated as Codable's. Instead they should just store as their rawValue (e.g. String in this case).

Tagged supports both protocols RawRepresentable and Codable
Anyway it must works fine? Or I must add additional ValueTransformer?

[inekipelov]

Same troubles when trying usage enum types

enum AccessLevel: String, Codable {
    case selfOnly = "selfonly"
    case master
    case technical
    case financial
}

@Model
final class StoredAccess: NSManagedObject {
    var accessLevel: AccessLevel
    ...
}

Crash

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unacceptable type of value for attribute: property = "accessLevel"; desired type = NSString; given type = _TtGC13ManagedModels10CodableBoxO5WE_UC11AccessLevel_; value = <_TtGC13ManagedModels10CodableBoxO5WE_UC11AccessLevel_: 0x600000030840>.'

[helje5]

Hm, weird. That is pretty much the same I'm doing in the sample app. Though maybe not Codable, that might interfere, need to check.

[inekipelov]

I'm some change init code and now have new console crash with fatalError

ManagedModels/PersistentModel+KVC.swift:249: Fatal error: No box found for non-optional Codable value for key token?

[helje5]

I pushed a fix for Codable+RawRepresentable properties to develop, but I didn't try the Tagged thing.

[helje5]

Also did a quick test w/ Tagged, seems to work.

[inekipelov]

@helje5 Have new error

Could not cast value of type 'Swift.Optional<Any>' (0x1f624fc18) to 'Swift.String' (0x1f6248898).

in PersistentModel+KVC.swift

[helje5]

With the 'develop' branch?

[inekipelov]

With the 'develop' branch?

yes