如何在AJV中使用超模式？

Question

我需要基于使用hyper-schema的现有模式实现一个json模式验证器，因此我尝试利用了ajv库(版本6.12.2)，下面是我的实现：

const Ajv = require('ajv');
// Ajv does not allow to import schema by uri, so I download them and put thems in thoses files
// I've download them directly from http://json-schema.org http://json-schema.org/draft-07/hyper-schema# and http://json-schema.org/draft-07/links#
const hyperSchema = require('./schemas/draft07/hyper-schema.json');
const linkSchema = require('./schemas/draft07/links.json');
var ajv = new Ajv();
ajv.addSchema([hyperSchema, linkSchema]); // unsure if I should use addSchema or addMetaSchema, so I tried both without success

获取以下错误：

<path_to_project>\node_modules\ajv\lib\ajv.js:352
    throw e;
    ^
[MissingRefError: can't resolve reference http://json-schema.org/draft-07/links# from id http://json-schema.org/draft-07/hyper-schema#] {        
  message: "can't resolve reference http://json-schema.org/draft-07/links# from id http://json-schema.org/draft-07/hyper-schema#",     
  missingRef: 'http://json-schema.org/draft-07/links',
  missingSchema: 'http://json-schema.org/draft-07/links'
}

如果我使用ajv.addSchema([linkSchema, hyperSchema]);，也可以选择这个

<path_to_project>\node_modules\ajv\lib\ajv.js:93
    if (!v) throw new Error('no schema with key or ref "' + schemaKeyRef + '"');
            ^


Error: no schema with key or ref "http://json-schema.org/draft-07/hyper-schema#"
    at Ajv.validate (<path_to_project>\node_modules\ajv\lib\ajv.js:93:19)
    at Ajv.validateSchema (<path_to_project>\node_modules\ajv\lib\ajv.js:174:20)
    at Ajv._addSchema (<path_to_project>\node_modules\ajv\lib\ajv.js:308:10)
    at Ajv.addSchema (<path_to_project>\node_modules\ajv\lib\ajv.js:137:29)
    at Ajv.addSchema (<path_to_project>\node_modules\ajv\lib\ajv.js:129:46)
    at Object.<anonymous> (<path_to_project>\index.js:6:5)
    at Module._compile (internal/modules/cjs/loader.js:1158:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1178:10)
    at Module.load (internal/modules/cjs/loader.js:1002:32)
    at Function.Module._load (internal/modules/cjs/loader.js:901:14)

我还尝试使用ajv.addSchema([hyperSchema, linkSchema], undefined, true)跳过模式验证，但在导入我的模式时失败，并出现以下错误(在验证超模式时)：

<path_to_project>\node_modules\ajv\lib\ajv.js:179
    else throw new Error(message);
         ^ 

Error: schema is invalid: data.properties['$ref'] should be object,boolean
    at Ajv.validateSchema (<path_to_project>\node_modules\ajv\lib\ajv.js:179:16)
    at Ajv._addSchema (<path_to_project>\node_modules\ajv\lib\ajv.js:308:10)
    at Ajv.addSchema (<path_to_project>\node_modules\ajv\lib\ajv.js:137:29)
    at Ajv.addSchema (<path_to_project>\node_modules\ajv\lib\ajv.js:129:46)
    at main (<path_to_project>\index.js:33:5)
    at Object.<anonymous> (<path_to_project>\index.js:35:1)
    at Module._compile (internal/modules/cjs/loader.js:1158:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1178:10)
    at Module.load (internal/modules/cjs/loader.js:1002:32)
    at Function.Module._load (internal/modules/cjs/loader.js:901:14)

我该如何处理这里的超模式？即使当hyper-schema.json看似已加载时，它也不能引用links。是与多个文件中addSchema的错误使用有关，还是由于ajv中的超模式处理？

Answer 1

一位好心人在与AJV (https://github.com/ajv-validator/ajv/issues/1236)相关的Github中回答了这个问题。

该错误是由模式中的错误定义引起的，而不是使用AJV的方式。