How to deserialize Enum value in Kotlin for #QueryValue annotation - kotlin

Question

I am trying to get lower case letters from Kotlin Enum class when i pass the object in #QueryValue, but i am getting only upper case letters.
I have an enum in data class for example like below:
enum class StudentName{
#JsonProperty("ram")
RAM,
#JsonProperty("sam")
SAM
}
and i am using that enum like below:
data class StudentParams(
#JsonProperty("studentName")
val studentName: StudentName,
#JsonProperty("age")
val age: Int
)
I am passing this data class as request object in param value like below
#Post(POST_STUDENT_AGE)
fun postStudentAge(
studentParams: StudentParams
): String
so in my URL, request object will go in params like --some url--/&studentName=ram&age=20
i need lower case letters from StudentName enum class here but getting only Upper case. When i pass the request object with #body annotation i am getting lower case letters in the request.
I tried enabling ACCEPT_CASE_INSENSITIVE_ENUMS also but didn't work.

Answer 1

Not sure if this would help, but you can convert the enum to String then invoke the toLowerCase(locale) function,
val ram = StudentName.RAM
val lowerCasedRam = ram.toString().toLowerCase(Locale.current)
when you pass a StudentParams to your postStudentAge,
postStudentAge(StudentParams(StudentName.RAM, 1))
you will do something like this.
fun postStudentAge(
studentParams: StudentParams
) {
val lowerCaseStudent = studentParams.studentName.toString().toLowerCase(Locale.current)
// use lowercase student
}
Calling
Log.e("StudentName", "$lowerCaseStudent")
prints
E/StudentName: ram

Answer 2

You can't just set object as QueryValue. You have to write your own converter. You can find it here.
Another way is write something like this:
#Post
fun postStudentAge(
#QueryValue studentName: StudentName,
#QueryValue studentAge: Int
) {
println(StudentParams(studentName, studentAge))
}
Then you can pass studentName value in lowercase:
localhost:8080?studentName=ram&studentAge=32
And it will work