将“anyOf”与“requred”一起使用时，Ajv 不验证 JSON 架构

Question

我有一个 JSON Schema，它允许对象具有一个或多个属性：

"properties": {
  "alpha": {
    "$ref": "#/$defs/alpha"
  },
  "beta": {
    "$ref": "#/$defs/beta"
  }
},
"anyOf": [
  {
    "required": [
      "alpha"
    ]
  },
  {
    "required": [
      "beta"
    ]
  }
]

使用 ajv compile 并启用 strict 模式来验证架构本身，验证失败。我该如何解决？

---

更新

看起来这是一个已知问题，目前无法解决：

• https://github.com/ajv-validator/ajv/issues/1571

---

我已尝试在 properties 上使用 anyOf，但虽然此架构验证，但它无法按预期工作：

"anyOf": [
  {
    "properties": {
      "alpha": {
        "$ref": "#/$defs/alpha"
      }
    },
    "required": [
      "alpha"
    ]
  },
  {
    "properties": {
      "beta": {
        "$ref": "#/$defs/beta"
      }
    },
    "required": [
      "beta"
    ]
  }
]

Ajv 命令

ajv compile --spec=draft2020 --validate-formats=true --verbose --all-errors --strict=true -c ajv-formats -s repro.json

Ajv 错误

schema repro.json is invalid
error: strict mode: required property "beta" is not defined at "repro.json#/anyOf/0" (strictRequired)

完整的 JSON 架构

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$ref": "#/$defs/root",
  "$defs": {
    "root": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "alpha": {
          "$ref": "#/$defs/alpha"
        },
        "beta": {
          "$ref": "#/$defs/beta"
        }
      },
      "anyOf": [
        {
          "required": [
            "alpha"
          ]
        },
        {
          "required": [
            "beta"
          ]
        }
      ]
    },
    "alpha": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "foo": {
          "type": "string"
        }
      }
    },
    "beta": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "bar": {
          "type": "string"
        }
      }
    }
  }
}

JSON 示例

{
  "alpha": {
    "foo": "xyz"
  }
}

Answer 1

您需要禁用严格模式，该模式认为任何required 关键字都需要与这些属性相邻的properties。

或者，您可以将属性定义移动到 anyOf 子句中 - 但您必须在两侧重复它们，这不是很好（否则您可以同时存在两个属性但其中一个不根据他们的架构进行验证）。

所以试试这个：

  "$defs": {
    "root": {
      "type": "object",
      "anyOf": [
        {
          "required": [
            "alpha"
          ],
          "properties": {
            "alpha": {
              "$ref": "#/$defs/alpha"
            },
            "beta": {
              "$ref": "#/$defs/beta"
            }
          },
          "additionalProperties": false,
        },
        {
          "required": [
            "beta"
          ],
          "properties": {
            "alpha": {
              "$ref": "#/$defs/alpha"
            },
            "beta": {
              "$ref": "#/$defs/beta"
            }
          },
          "additionalProperties": false
        }
      ]
    }
  },
  ...