Nested beans with StaticTableSchema & enhanced DynamoDB client from AWS Java SDK 2.x

Question

How do I create a StaticTableSchema for a nested bean (like for the items property here)?

data class Order(
    var id: Long = 0L,
    var items: List<OrderLineItem> = emptyList(),
    …
)

data class OrderLineItem(
    var id: Long = 0L,
    var price: BigDecimal = 0.0.toBigDecimal(),
    …
)

Answer 1

First, create a TableSchema implementation for the nested bean. It could be a StaticTableSchema or a BeanTableSchema:

val orderLineItemStaticTableSchema = TableSchema
    .builder(OrderLineItem::class.java)
    .newItemSupplier(::OrderLineItem)
    .addAttribute(Long::class.java) {
        it.name("id").getter(OrderLineItem::id::get).setter(OrderLineItem::id::set)
    }
    .addAttribute(BigDecimal::class.java) {
        it.name("price").getter(OrderLineItem::price::get).setter(OrderLineItem::price::set)
    }
    .build()

// or

val orderLineItemBeanTableSchema = TableSchema.fromBean(OrderLineItem::class.java)

Then, use this schema instance with EnhancedType.documentOf():

val tableSchema = TableSchema
    .builder(Order::class.java)
    .newItemSupplier(::Order)
    .addAttribute(Long::class.java) {
        it.name("id").getter(Order::id::get).setter(Order::id::set)
    }
    .addAttribute(
        EnhancedType.listOf(
            EnhancedType.documentOf(OrderLineItem::class.java, orderLineItemTableSchema)
        )
    ) {
        it.name("items").getter(Order::items::get).setter(Order::items::set)
    }
    .build()