Hi, can someone suggest with freeze() method. Is it a bug or I do something wrong: I create instance...

# multiplatform

[Vlad Ivanov]

Hi, can someone suggest with freeze() method. Is it a bug or I do something wrong:
I create instance of Kotlin data class from Swift. Then I pass this instance to Kotlin code, where I call freeze() for passing it to another thread.
Per documentation freeze() should freeze this instance and its subgraph. But I found that It freezes only itself. Subgraph stays untouched and not frozen.
Example:

data class Foo(val bars: List<Bar>)

// create instance of Foo with bars on Swift side and pass it to some Kotlin Multiplatform class where I call
foo.freeze()
// now I expect that bars are frozen, but they are not
// as a workaround I use
foo.bars.forEach { it.freeze() }

When I do the same purely in Kotlin - everything works as expected, instance of Foo is frozen and all its properties

[Artyom Degtyarev [JB]]

Hello, can you please file an issue on kotl.in/issue with a project to reproduce this behaviour?

[Vlad Ivanov]

Hello @Artyom Degtyarev [JB]. I've created
https://youtrack.jetbrains.com/issue/KT-44108

[Vlad Ivanov]

For those who faced with the same behavior:
https://youtrack.jetbrains.com/issue/KT-44108#focus=Comments-27-4640035.0-0

[Nikolay Kasyanov]

I hit this yesterday. I wonder if there’s a blessed workaround? One idea I came up with is use KotlinArray instead of a List to get deep-freezing as expected. cc @svyatoslav.scherbina sorry for tagging but you commented on the ticket 🙏

[svyatoslav.scherbina]

One idea I came up with is use KotlinArray instead of a List to get deep-freezing as expected.

This should work. Alternatively, you can instantiate a List in Kotlin. In particular, creating Swift array (in Swift) and copying it in Kotlin with .toList() should work.