Joi验证：如何使嵌套json中的值可选？

Question

所以我有一个嵌套的json，如下所示，这是我正在编写的api的有效负载结构

{"item_id":"1245",
"item_name":"asdffd",
"item_Code":"1244",
"attributes":[{"id":"it1","value":"1"},{"id":"it2","value":"1"}],
"itemUUID":"03741a30-3d62-11e8-b68b-17ec7a13337"}

我对有效负载的Joi验证是：

validate: {
                    payload: Joi.object({
                        item_id: Joi.string().required(),
                        item_name: Joi.string().required(),
                        placeId: Joi.string().allow('').allow(null),
                        itemUUID: Joi.string().allow('').allow(null),
                        item_Code: Joi.string().required().allow(null),
                        attributes: Joi.alternatives().try(attributeObjectSchema, attributesArraySchema).optional()
                    })
                }

哪里

const attributeObjectSchema = Joi.object({
    id: Joi.string().optional(),
    value: Joi.string().optional()
}).optional();

和

const attributeArraySchema = Joi.array().items(customAttributeObjectSchema).optional();

我的问题是：通过上述Joi验证，如果我编辑有效负载并像下面一样发送我的attribute标签（即“ values”为空）

"attributes":[{"id":"CA1","value":""},{"id":"CA2","value":""}]

它抛出一个错误，说：

"message": "child \"attributes\" fails because [\"attributes\" must be an object, \"attributes\" at position 0 fails because [child \"value\" fails because [\"value\" is not allowed to be empty]]]",
  "validation": {
    "source": "payload",
    "keys": [
      "attributes",
      "attributes.0.value"
    ]

我在这里做错了什么？ 如果我需要Joi接受以下内容，该怎么办：

 "attributes":[{"id":"CA1","value":""},{"id":"CA2","value":""}]

Answer 1

做这样的事情

attributeArraySchema.customAttributes = [];
attributeArraySchema.customAttributes = [
    {"id":"CA1","value":""},
    {"id":"CA2","value":""}
];

Answer 2

所以我通过更改以下架构定义来解决此问题

const attributeObjectSchema = Joi.object({
    id: Joi.string().optional(),
    value: Joi.string().optional()
}).optional();

至

const attributeObjectSchema = Joi.object({
    id: Joi.string().optional(),
    value: Joi.string().allow('').allow(null)
}).optional();