How Serialize nested class with kotlinx.serialization

Question

I need get breadType property from Sandwich class. I have 2 clases both serializable:

@Serializable
class MyFood {
    var name: String? = null
    var price: Int? = null
    var sand: Sandwich? = null
}

@Serializable
class Sandwich{
    var breadType: String? = null
}

And this JSON:

"MyFood": {
    "name": "Sandwich double",
    "price": 100.00,
    "breadType": 100.00
 }

I get JsonUnknownKeyException exception:

"Strict JSON encountered unknown key: breadType\nYou can disable strict mode to skip unknown keys"

What I do wrong please!?

There is no "sand" key in your JSON. Do you want to convert the JSON into objects? — Mohammad Zarei, May 12 '20 at 19:28
I want convert it to MyFood object. I need ignore "sand" and get all properties of Sandwich as they were of MyFood — Andy, May 12 '20 at 19:36
You need to change your `MyFood` object. Is it allowed to do that? — Mohammad Zarei, May 12 '20 at 19:43

score 0 · Answer 1 · edited Jan 22 '21 at 10:32

0

If you are using Retrofit:

Use JsonConfiguration(strictMode = false) on retrofit converter factory.

// your retrofit builder
.addConverterFactory(
    Json(
        JsonConfiguration(strictMode = false)
    ).asConverterFactory(MediaType.get("application/json"))
)

In other words,You should use Json.nonstrict.parse() instead of Json.parse()

Or we can pass in constructor:

serializer = KotlinxSerializer(Json.nonstrict)

Edited:

As per your json your class should be like this:

Serializable
class MyFood {
    var name: String? = null
    var price: Int? = null
    var breadType: double? = null
}

This will work but if you want to use Sandwich class then your json should be like this:

"MyFood": { 
    "name": "Sandwich double",
    "price": 100.00, 
    "sand": {
        "breadType":100.00
    }
}

edited Jan 22 '21 at 10:32

hippietrail

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answered May 12 '20 at 19:26

Muazzam A.

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I need get all properties of Sandwich as they were of MyFood – Andy May 12 '20 at 20:44
1

I hope you got it what's the issue – Muazzam A. May 12 '20 at 21:16
Thanks. I can modify json or MyFood class :( – Andy May 12 '20 at 21:31

How Serialize nested class with kotlinx.serialization

1 Answers1