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我正在尝试使用 SwagGen 从 OpenAPI 3.0 规范生成客户端代码。示例规范是https://github.com/yonaskolb/SwagGen/blob/master/Specs/Petstore/spec.yml（翻译成 json）并且在调用时工作正常：

swaggen generate spec.json

我想用代表 Pet 的外部模式替换组件/模式部分：

      "schemas": {
         "Pet": {
            "required": [
               "id",
               "name"
            ],
            "properties": {
               "id": {
                  "type": "integer",
                  "format": "int64"
               },
               "name": {
                  "type": "string"
               },
               "tag": {
                  "type": "string"
               }
            }
         },

和

      "schemas": {
         "Pet": {
            "$ref": "pet.json"
         },

其中 pet.json 位于同一目录中，如下所示：

{
  "$schema": "http://json-schema.org/draft-05/schema#",
  "$id": "https://example.com/schema/pet.json",
  "title": "Pet",
  "description": "Pet",
  "type": "object",
  "properties": {
    "id": {
      "description": "id",
      "type": "integer",
      "format": "int64"
    },
    "name": {
      "description": "name",
      "type": "string"
    },
    "tag": {
      "type": "string"
    }
  },
  "required": [
    "id",
    "name"
  ]
}

这给了我一个错误Fatal error: Reference ./pet.json is unresolved: file /private/tmp/swaggen-20190424-43085-jvmk5p/SwagGen-4.1.0/Sources/Swagger/Component/Reference.swift, line 10 Illegal instruction: 4

出于某种原因，当我改用 #ref 时：

      "schemas": {
         "Pet": {
            "#ref": "./pet.json"
         },

一代成功。但是，生成的 Pet 模型是空的：

// Generated by SwagGen
// https://github.com/yonaskolb/SwagGen
//

import Foundation

public class Pet: APIModel {

    public init() {
    }

    public required init(from decoder: Decoder) throws {
    }

    public func encode(to encoder: Encoder) throws {
    }

    public func isEqual(to object: Any?) -> Bool {
      guard object is Pet else { return false }
      return true
    }

    public static func == (lhs: Pet, rhs: Pet) -> Bool {
        return lhs.isEqual(to: rhs)
    }
}

我试图理解为什么 $ref 会导致未解决的问题，为什么 #ref 会起作用，但会导致 Pet 模型不正确。

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