Nullable

Define nullable property

You can define property as nullable.

@DynamoEntity()
class Cat {
    @DynamoProperty({ keyType: KeyType.hash })
    id!: number;

    @DynamoProperty({ keyType: KeyType.sort })
    age!: number;

    @DynamoProperty({
        keyType: KeyType.attr,
        nullable: true  // <<<
    })
    name?: string;

    constructor(id: number, age: number, name?: string) {
        this.id = id;
        this.age = age;
        this.name = name;
    }
}

HASH and SORTshould not be nullable.

For example,

const badCat: Cat = new Cat(0, 1);
const dynamo: AttributeMap = Mapper.formation(badCat, Cat);

It will formationed as,

{
    "id": {
        "N": "0"
    },
    "age": {
        "N": "1"
    },
    "name": {
        "NULL": true   // <<<
    }
}