Unable to update the boolean value using retrofit post

Question

I'm trying to make post request using retrofit:

class PostContentModel {

    @SerializedName("createdBy")
    var createdBy: UserDTO? = null

    @SerializedName("postID")
    var postID: String? = null

    @SerializedName("isMemory")
    var isMemory: Boolean?= false
}

    @POST("v1/posts")
    fun postContent(@Body map: PostContentModel?): Call<ResponseBody>

now in my main activity when i try sending data using retrofit, the createBy and and postID fields are getting updated but the isMemory(boolean) is not getting updated if i set it to true.

    val postContentModel: PostContentModel? = PostContentModel()

postContentModel?.createdBy = "xyz"
postContentModel?.postID= "5"
postContentModel?.isMemory= true
ApiCall.postContent(postContentModel)

so now when i check the server the first 2 values have updated but the isMemory is still left at default false value which was preset in the server.