kotlin exposed select with foreign key - kotlin

Question

I have two tables like as I described below
object Categories : LongIdTable() {
val name = varchar(name = "name", length = 50).uniqueIndex()
val count = integer(name = "count")
val page = integer(name = "page")
}
object Images : LongIdTable() {
val color = varchar(name = "color", length = 100)
val blurHash = varchar(name = "blurHash", length = 200)
val unsplashId = varchar(name = "unsplashId", length = 200)
val category = reference(name = "category", Categories.name).nullable()
val isAvailable = bool(name = "isAvailable")
val imagePath = varchar(name = "imagePath", length = 500)
}
and here is my Image & Category data classes
#Serializable
data class Image(
val id: Long,
val unsplashId: String,
val isAvailable: Boolean = false,
val color: String,
val blurHash: String,
var category: Category?,
val imagePath: String,
)
#Serializable
data class Category(
val id: Long,
val name: String,
val count: Int,
var imagePath: String?,
val page: Int
)
when I want to find images by their id I can't map category attribute
fun getImageById(id: Long): Image {
val images = ArrayList<Image>()
var categoryName = ""
transaction {
Images.select {
Images.id eq id
}.map { row ->
categoryName = row[Images.category]!!
images.add(
Image(
id = row[Images.id].value,
unsplashId = row[Images.unsplashId],
isAvailable = false,
color = row[Images.color],
blurHash = row[Images.blurHash],
category = null,
imagePath = row[Images.imagePath]
)
)
}
images[0].category = categoryRepository.getCategoryByName(categoryName)
}
return images[0]
}
how can I solve this priblem?