Kotlin gson.fromJSON doesn't allow initialization at declaration - json

Question

Using Kotlin:
I have a class with different variable names than my JSON field names. When I call gson.fromJSON(string, Array<MyClass>::class.java, the initialization at declaration doesn't occur.
My understand from another post that declaration isn't called with constructor that only the only the constructor is called.
How, then do I easily get my JSON data into my class without calling the gson.fromJSON and the calling my class?
I'm not a very advanced developer. I'm looking for code as simple as possible that is efficient systematically.
What I want to do is:
val gson = Gson()
val seriesFirebaseList = gson.fromJson(seriesJSONArrayString, Array<Series>::class.java).toList()
class Series(Series_Unique_ID: String,
Series_Record_Name: String,
Series_Name: String,
Series_From_Year: Int,
Series_To_Year: Int?,
Is_Active: Int,
Logo_Image_Name: String,
Sort_Order: Int) {
val uniqueId: String = Series_Unique_ID
val recordName: String = Series_Record_Name
val seriesName: String = Series_Name
val fromYear: Int = Series_From_Year
var toYear: Int? = Series_To_Year
var isActive: Boolean = Is_Active == 1
val logoImageName: String = Logo_Image_Name
val sortOrder: Int = Sort_Order
// generated data
var imageFirebaseURLString: String? = null
var isFavoriteSeries = false
}
But, all the variables end up null or default value, not the JSON values.
The only thing I can get to work which seems really inefficient is to call the JSON firebase class then convert that to my class
val gson = Gson()
// create seriesFirebase
val seriesFirebaseList = gson.fromJson(seriesJSONArrayString, Array<SeriesFirebase>::class.java).toList()
val seriesList = mutableListOf<Series>()
seriesFirebaseList.forEach { seriesFirebase ->
val series = Series(seriesFirebase)
seriesList.add(series)
}
// series models
class Series(seriesFirebase: SeriesFirebase) {
val uniqueId: String = seriesFirebase.Series_Unique_ID
val recordName: String = seriesFirebase.Series_Record_Name
val seriesName: String = seriesFirebase.Series_Name
val fromYear: Int = seriesFirebase.Series_From_Year
var toYear: Int? = seriesFirebase.Series_To_Year
var isActive: Boolean = seriesFirebase.Is_Active == 1
val logoImageName: String = seriesFirebase.Logo_Image_Name
val sortOrder: Int = seriesFirebase.Sort_Order
// generated data
var imageFirebaseURLString: String? = null
var isFavoriteSeries = false
}
// used to convert Gson/JSON
class SeriesFirebase(val Series_Unique_ID: String,
val Series_Record_Name: String,
val Series_Name: String,
val Series_From_Year: Int,
val Series_To_Year: Int?,
val Is_Active: Int,
val Logo_Image_Name: String,
val Sort_Order: Int) {
constructor() : this(
"",
"",
"",
0,
2150,
0,
"",
0
)
override fun toString(): String {
return ("series: uniqueId: " + Series_Unique_ID
+ "; recordName: " + Series_Name
+ "; name: " + Series_Name
+ "; fromYear: " + Series_From_Year
+ "; toYear: " + Series_To_Year
+ "; isActive: " + Is_Active
+ "; logoImageName: " + Logo_Image_Name
+ "; sortOrder: " + Sort_Order)
}
}

Answer 1

You can mark fields of Series class with #SerializedName. E.g.
#SerializedName("Series_Record_Name")
val recordName: String