Realm kotlin json to model

Question

I have this json data and I want to convert it to Realm model:

{
"_id": "63dceb34a8c4bbeee1c807f9",
"weeks": [2, 3, 2, 3],
}

and this is my kotlin model:

open class ProgramDoc() : RealmObject {
    @PrimaryKey
    var _id: String = "",
    var weeks: RealmList<Int> = realmListOf<Int>()

}

But I got this error:

ProgramDoc.sessionPerWeek has type io.realm.kotlin.types.RealmList, got java.util.ArrayList

Any help please.

Answer 1

The problem here is that in your JSON data contains an ArrayList but your Realm model is expecting a RealmList.

What you can do is convert the ArrayList to a RealmList before mapping it to your Realm model.

open class ProgramDoc : RealmObject() {
    @PrimaryKey
    var _id: String = ""
    var weeks: RealmList<Int> = RealmList()
}

Example of how to get ProgramDoc model from a json :

val jsonObject = JSONObject(YOUR_JSON_HERE)

val programDoc = ProgramDoc(
    _id = jsonObject.getString("_id"),
    weeks = RealmList(jsonObject.getJSONArray("weeks").toList().map { it as Int })
)