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Add support for templatedRef in Reference Object

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難度
5/5
預估耗時
一週以上
新手友好度
25/100
Issue 類型
功能
描述清晰度
需要釐清
活躍度
停滯

研究方向

先查看 Reference Object 定義、JSON Reference 資料、RFC 6570,以及連結的 JSON Schema 詞彙討論。只有在 $templatedRef 的語意和範圍達成共識,並且規格清楚到足以支援 collection 和 style 範例時,工作才算完成。

由索引模型根據 Issue 內容生成。

描述

Proposing to add support for "$templatedRef" to Reference Objects supporting templated references, allowing referencing dynamic schemas that could be retrieved by substituting the template variables by the selected value for earlier path parameters
so that later path parameters can be defined differently based on earlier path parameters.

Example:

  "parameters" :
   {
      "collection-styleId" :
      {
         "name" : "styleId",
         "schema" :
         {
            "$templatedRef" : "./api/collections-styles/{collectionId}"`
         }         
      }
   }

As it was initially suggested that this would require to first extend JSON schema, an initial discussion took place in https://github.com/json-schema-org/json-schema-vocabularies/issues/36 . However reading on https://swagger.io/specification/ that the Reference Object is defined by the JSON Reference, rather than by JSON Schema, it seems that this could rather simply be extended with$templatedRef, following https://tools.ietf.org/html/rfc6570 (or a simpler subset of it).

The {collectionId} template would be replaced by a selected value like collection1.
(e.g. in this example, this "$templatedRef" is used to define the valid values for {styleId} in a path /collections/{collectionId}/styles/{styleId}).

The {collectionId} would have previously been validated against another potentially dynamic list like "$ref" : "./api/collections".

./api/collections would return something like:

{
   "type" : "string",
   "enum" : [
      "collection1",
      "collection2",
      "collection3"
   ]
}

and ./api/collection-styles/collection1 would return something like

{
   "type" : "string",
   "enum" : [
      "style234",
      "style235",
      "style236"
   ]
}

while ./api/collection-styles/collection2 would return something like

{
   "type" : "string",
   "enum" : [
      "style454",
      "style455",
      "style456"
   ]
}

The context being that available/compatibles styles depend on the selected collection.

Such a capability would allow to define much more interoperable APIs, where the specifics of a particular instance / deployment would be left to the templated references. In turn this would allow to automatically generate clients from an API definition that will work with multiple instances of the same templatable API, therefore extending the usability of clients automatically generated from OpenAPI definitions beyond on-the-fly client generation, more suitable for compiled programming languages.

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