Moshi fails on Kotlin lazy properties

Question

When deserializing a class with Moshi it fails on by lazy property with error:

IllegalArgumentException: No JsonAdapter for interface kotlin.Lazy annotated []

So I want to tell Moshi to ignore the property. The way to ignore this is apparently to use @Transient however that can only be used on a field - not a property.

So how to ignore Kotlin lazy properties when deserializing with Moshi?

score 8 · Accepted Answer · answered Mar 02 '18 at 13:39

8

You can annotate the delegate itself:

class Foo {
    @delegate:Transient
    val bar by lazy { true }
}

answered Mar 02 '18 at 13:39

tynn

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Thanks... while this does work, it turns out there is another problem with lazy properties that are not initialized when deserialized by Moshi (NullPointerException) due to not have a no-arg constructor. But that is a different question. – Greg Ennis Mar 02 '18 at 14:33
@GregEnnis did you ever figure out how to initialise delegated properties in classes instantiated by Moshi during deserialisation? – Ernest Zamelczyk Dec 21 '18 at 07:42
I dont think so. I really wish Moshi used something other than Transient, which carries a lot of other meanings along with it. – Greg Ennis Dec 22 '18 at 16:10
If this is till an issue, add KotlinJsonAdapterFactory to moshi builder when building adapter: `Moshi.Builder().add(KotlinJsonAdapterFactory()).build().adapter(MyClass::class.java)` – jhavatar Mar 27 '19 at 09:51

Moshi fails on Kotlin lazy properties

1 Answers1