Question

我正在尝试扩展JSON模式，它定义了一个枚举：

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "definitions": {
    "objType": {
      "enum": [ "A", "B" ]
    },
    "baseType": {
      "type": "object",
      "properties": {
        "category": { "$ref": "#/definitions/objType" }
      }
    }
  },
  "properties": {
    "A": {
      "allOf": [
        { "$ref": "#/definitions/baseType" },
        /* how to restrict inherited `category' to "A"? */
        { /* properties specific to A */ }
      ]
    },
    "B": {
      "allOf": [
        { "$ref": "#/definitions/baseType" },
        /* how to restrict inherited `category' to "B"? */
        { /* properties specific to B */ }
      ]
    }
  }
}

我不确定如何将继承的枚举属性限制为特定值。例如：

// passes validation
{
  "category": "A",
  "prop_A": "blah A"
}

// fails because `prop_A' is not valid property for category "B"
{
  "category": "B",
  "prop_A":  "blah A"
}

感谢。

Answer 1

JSON Schema是一个约束系统而不是面向对象的系统，因此作为概念的“继承”并不适合。有关详细信息，请参阅https://github.com/json-schema-org/json-schema-org.github.io/issues/148。

但是，在您的情况下，我认为约束系统正是您想要的。在约束系统中，您始终可以添加更多约束，但永远不能删除它们。因此，将枚举限制为其“继承”值的子集就像使用"allOf"在原始的双值枚举顶部添加单值枚举的约束一样简单。

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "definitions": {
    "objType": {
      "enum": [ "A", "B" ]
    },
    "baseType": {
      "type": "object",
      "properties": {
        "category": { "$ref": "#/definitions/objType" }
      }
    }
  },
  "properties": {
    "A": {
      "allOf": [
        { "$ref": "#/definitions/baseType" },
        { "objType": { "enum": [ "A" ] }.
        { /* properties specific to A */ }
      ]
    },
    "B": {
      "allOf": [
        { "$ref": "#/definitions/baseType" },
        { "objType": { "enum": [ "B" ] }.
        { /* properties specific to B */ }
      ]
    }
  }
}

您只需要在实际使用它的位置进一步约束每种类型属性的枚举。

Answer 2

在Building a mount point schema示例中，他们的做法略有不同。每个<?php session_start(); $user_id = $_SESSION['sess_user_id']; $role = $_SESSION['sess_userrole']; $Address = $_SESSION['sess_address']; $City = $_SESSION['sess_city']; $avatar = $_SESSION['avatar']; $currentuser = $_SESSION['sess_username']; $first_name = $_SESSION['sess_first_name']; $last_name = $_SESSION['sess_last_name']; $id = $_SESSION['sess_hotel_id']; $_SESSION['hotel_name'] = $name; $_SESSION['hotel_image'] = $image; if(isset($_POST["submitfeedback"])) { $link=mysqli_connect("127.0.0.1", "lakbayph", "aaEPl6122n"); mysqli_select_db($link,"lakbayph_category"); $title_of_feedback = $_POST['review_title']; $textarea = $_POST['limitedtextarea']; $count=0; $res=mysqli_query($link,"select * from Reviews where review_title='$title_of_feedback'"); $count=mysqli_num_rows($res); if($count>0) { echo "Sorry, this title is already used, try again"; } else { print_r($_FILES); $avatar_path = $link->real_escape_string('images/'.$_FILES['avatar']['name']); if(preg_match("!image!", $_FILES['avatar']['type'])) { if(copy($_FILES['avatar']['tmp_name'], $avatar_path)){ mysqli_query($link,"INSERT INTO `Reviews` VALUES('','$id','NONE','NONE','NONE','$user_id','$title_of_feedback','$textarea','$avatar_path')"); echo 'Registration succesful! Added $username to the database!'; header("location: SearcResult.php"); if ($link->query($sql) === true) { $_SESSION['message'] = 'Registration succesful! Added $username to the database!'; header("location: welcome.php"); } else { echo "User could not be added to the database!"; } } else{ echo "File upload failed!"; } } else{ echo "Please only upload GIF and JPEG"; } } } ?>指的是几种类型的对象之一：

storage

并且每个对象类型都包含具有不同值的"properties": { "storage": { "type": "object", "oneOf": [ { "$ref": "#/definitions/diskDevice" }, { "$ref": "#/definitions/diskUUID" }, { "$ref": "#/definitions/nfs" }, { "$ref": "#/definitions/tmpfs" } ] },枚举。例如type以这种方式指定diskDevice

type

而"properties": { "type": { "enum": [ "disk" ] }, "device": { "type": "string", "pattern": "^/dev/[^/]+(/[^/]+)*$" }以这种方式指定nfs

type

也许您可以考虑按照这些方式重构您的架构。

Answer 3

使用Schema Draft v6，这似乎是可能的：

{
    "$schema": "http://json-schema.org/draft-06/schema#",
    "type": "object",
    "oneOf": [
        {
            "additionalProperties": false,
            "properties": {
                "category": {
                    "type": "string",
                    "const": "A"
                },
                "prop_A": {
                    "type": "string"
                }
            }
        },
        {
            "additionalProperties": false,
            "properties": {
                "category": {
                    "type": "string",
                    "const": "B"
                },
                "prop_B": {
                    "type": "string"
                }
            }
        }
    ]
}

JSON模式draft-04：扩展为特定的“枚举”值

3 个答案: