JSON Schema 2020-12版对象数组中enum枚举验证不生效问题

问题根源 #

你写的两份Schema存在相同的结构错误：
main字段是对象类型，你把它下属的items数组的校验规则直接写在了main的properties节点同级，这个位置的items关键字仅对数组类型的节点生效，对对象类型节点完全无效，所以数组元素的校验规则从未被执行，自然不会抛出错误。

修正方案 #

把main下的items数组的定义挪到main的properties节点内部即可，以下是修正后的完整Schema（基于写法1修改）：

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://example.com/schema.json",
  "$defs": {
    "my_shiny_object": {
      "type": "object",
      "required": [
        "attribute1"
      ],
      "properties": {
        "attribute1": {
          "description": "This is mandatory attribute 1 with an enum",
          "type": "string",
          "enum": [
            "Option 1",
            "Option 2",
            "Option 3"
          ]
        },
        "attribute2": {
          "type": "string",
          "description": "This is an optional attribute 2"
        }
      }
    }
  },
  "title": "root",
  "description": "Root Element.",
  "type": "object",
  "required": [
    "main"
  ],
  "properties": {
    "main": {
      "type": "object",
      "title": "main",
      "description": "Main is the top level field.",
      "required": [
        "items"
      ],
      "properties": {
        "date_time": {
          "type": "string",
          "format": "date-time",
          "title": "Date/time optional",
          "description": "Date time"
        },
        "items": {
          "type": "array",
          "description": "Items included in main",
          "items": {
            "$ref": "#/$defs/my_shiny_object"
          }
        }
      }
    }
  }
}

修改后再测试，当attribute1缺失、取值不在枚举范围内时都会正常抛出校验错误。

内容的提问来源于stack exchange，提问作者user1452030