Joi驗證：如何使嵌套json中的值可選？

Question

所以我有一個嵌套的json，如下所示，這是我正在編寫的api的有效負載結構

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

我對有效負載的Joi驗證是：

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();

我的問題是：通過上述Joi驗證，如果我編輯有效負載並像下面一樣發送我的attribute標簽（即“ values”為空）

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

它拋出一個錯誤，說：

"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"
    ]

我在這里做錯了什么？ 如果我需要Joi接受以下內容，該怎么辦：

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

Answer 1

做這樣的事情

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

Answer 2

所以我通過更改以下架構定義來解決此問題

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();