Kotlin data class: member not getting initialized when using as a retrofit response

Question

data class A (val x: Array<String>? = null) {
    val y = x?.filter { it!="something" }
}

This code should make member y to be calculated when an A object is created.

When I initiate an A object, both x and y gets a value. However, when I define object A as a response in a GET request using retrofit2, x gets a value but y is null. I cannot figure out the reason, (maybe relative to threads? I am using retrofit with coroutines), but can not explain it.

Any ideas?

Does this even compile? If `x` is nullable, `x.filter` shouldn't compile at all. — Todd, Nov 26 '19 at 21:51
Just a note: Your filter doesn't do anything, because your input array cannot contain nulls. — marstran, Nov 26 '19 at 22:05

score 0 · Answer 1 · answered Nov 27 '19 at 14:18

0

This will depend on which Converter.Factory you use for Retrofit, but yours probably uses reflection in a way which doesn't actually call the constructor. I'd try MoshiConverterFactory (if your GET response is JSON) and see if it fixes the problem.

answered Nov 27 '19 at 14:18

Alexey Romanov

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Kotlin data class: member not getting initialized when using as a retrofit response

1 Answers1