go-swagger不生成模型信息

Question

下面是我的简单rest服务：

// Package classification User API.
//
// the purpose of this application is to provide an application
// that is using plain go code to define an API
//
// This should demonstrate all the possible comment annotations
// that are available to turn go code into a fully compliant swagger 2.0 spec
//
// Terms Of Service:
//
// there are no TOS at this moment, use at your own risk we take no responsibility
//
//     Schemes: http, https
//     Host: localhost
//     BasePath: /v2
//     Version: 0.0.1
//     License: MIT http://opensource.org/licenses/MIT
//     Contact: John Doe<john.doe@example.com> http://john.doe.com
//
//     Consumes:
//     - application/json
//     - application/xml
//
//     Produces:
//     - application/json
//     - application/xml
//
//
// swagger:meta
package main
import (
 "github.com/gin-gonic/gin"
 "strconv"
 "database/sql"
 _ "github.com/go-sql-driver/mysql"
 "gopkg.in/gorp.v1"
 "log"
)

// swagger:model
// User represents the user for this application
//
// A user is the security principal for this application.
// It's also used as one of main axis for reporting.
//
// A user can have friends with whom they can share what they like.
//
type User struct {
    // the id for this user
    //
    // required: true
    // min: 1
    Id int64 `db:"id" json:"id"`
    // the first name for this user
    // required: true
    // min length: 3
    Firstname string `db:"firstname" json:"firstname"`
    // the last name for this user
    // required: true
    // min length: 3
    Lastname string `db:"lastname" json:"lastname"`
}

func main() {
 r := gin.Default()
 r.Use(Cors())
 v1 := r.Group("api/v1")
 {
 v1.GET("/users", GetUsers)
 v1.GET("/users/:id", GetUser)
 v1.POST("/users", PostUser)
 v1.PUT("/users/:id", UpdateUser)
 v1.DELETE("/users/:id", DeleteUser)
 v1.OPTIONS("/users", OptionsUser)     // POST
 v1.OPTIONS("/users/:id", OptionsUser) // PUT, DELETE
 }
r.Run(":8696")
}


func GetUsers(c *gin.Context) {
    // swagger:route GET /user listPets pets users
    //
    // Lists pets filtered by some parameters.
    //
    // This will show all available pets by default.
    // You can get the pets that are out of stock
    //
    //     Consumes:
    //     - application/json
    //     - application/x-protobuf
    //
    //     Produces:
    //     - application/json
    //     - application/x-protobuf
    //
    //     Schemes: http, https, ws, wss
    //
    //     Security:
    //       api_key:
    //       oauth: read, write
    //
    //     Responses:
    //       default: genericError
    //       200: someResponse
    //       422: validationError
     var users []User
     _, err := dbmap.Select(&users, "SELECT * FROM user")
    if err == nil {
     c.JSON(200, users)
     } else {
     c.JSON(404, gin.H{"error": "no user(s) into the table"})
 }
// curl -i http://localhost:8080/api/v1/users
}

func GetUser(c *gin.Context) {
 id := c.Params.ByName("id")
 var user User
 err := dbmap.SelectOne(&user, "SELECT * FROM user WHERE id=?", id)
if err == nil {
 user_id, _ := strconv.ParseInt(id, 0, 64)
content := &User{
 Id: user_id,
 Firstname: user.Firstname,
 Lastname: user.Lastname,
 }
 c.JSON(200, content)
 } else {
 c.JSON(404, gin.H{"error": "user not found"})
 }
// curl -i http://localhost:8080/api/v1/users/1
}

func PostUser(c *gin.Context) {
 var user User
 c.Bind(&user)
if user.Firstname != "" && user.Lastname != "" {
if insert, _ := dbmap.Exec(`INSERT INTO user (firstname, lastname) VALUES (?, ?)`, user.Firstname, user.Lastname); insert != nil {
 user_id, err := insert.LastInsertId()
 if err == nil {
 content := &User{
 Id: user_id,
 Firstname: user.Firstname,
 Lastname: user.Lastname,
 }
 c.JSON(201, content)
 } else {
 checkErr(err, "Insert failed")
 }
 }
} else {
 c.JSON(422, gin.H{"error": "fields are empty"})
 }
// curl -i -X POST -H "Content-Type: application/json" -d "{ \"firstname\": \"Thea\", \"lastname\": \"Queen\" }" http://localhost:8080/api/v1/users
}

func UpdateUser(c *gin.Context) {
 id := c.Params.ByName("id")
 var user User
 err := dbmap.SelectOne(&user, "SELECT * FROM user WHERE id=?", id)
if err == nil {
 var json User
 c.Bind(&json)
user_id, _ := strconv.ParseInt(id, 0, 64)
user := User{
 Id: user_id,
 Firstname: json.Firstname,
 Lastname: json.Lastname,
 }
if user.Firstname != "" && user.Lastname != ""{
 _, err = dbmap.Update(&user)
if err == nil {
 c.JSON(200, user)
 } else {
 checkErr(err, "Updated failed")
 }
} else {
 c.JSON(422, gin.H{"error": "fields are empty"})
 }
} else {
 c.JSON(404, gin.H{"error": "user not found"})
 }
// curl -i -X PUT -H "Content-Type: application/json" -d "{ \"firstname\": \"Thea\", \"lastname\": \"Merlyn\" }" http://localhost:8080/api/v1/users/1
}

func DeleteUser(c *gin.Context) {
 id := c.Params.ByName("id")
var user User
 err := dbmap.SelectOne(&user, "SELECT id FROM user WHERE id=?", id)
if err == nil {
 _, err = dbmap.Delete(&user)
if err == nil {
 c.JSON(200, gin.H{"id #" + id: " deleted"})
 } else {
 checkErr(err, "Delete failed")
 }
} else {
 c.JSON(404, gin.H{"error": "user not found"})
 }
// curl -i -X DELETE http://localhost:8080/api/v1/users/1
}

var dbmap = initDb()
func initDb() *gorp.DbMap {
 db, err := sql.Open("mysql",
        "root:max_123@tcp(127.0.0.1:3306)/gotest")
 checkErr(err, "sql.Open failed")
 dbmap := &gorp.DbMap{Db: db, Dialect:           gorp.MySQLDialect{"InnoDB", "UTF8"}}
 dbmap.AddTableWithName(User{}, "User").SetKeys(true, "Id")
 err = dbmap.CreateTablesIfNotExists()
 checkErr(err, "Create table failed")
return dbmap
}

func checkErr(err error, msg string) {
 if err != nil {
 log.Fatalln(msg, err)
 }
}


func Cors() gin.HandlerFunc {
 return func(c *gin.Context) {
 c.Writer.Header().Add("Access-Control-Allow-Origin", "*")
 c.Next()
 }
}

func OptionsUser(c *gin.Context) {
 c.Writer.Header().Add("Access-Control-Allow-Origin", "*")
 c.Writer.Header().Set("Access-Control-Allow-Methods", "DELETE,POST, PUT")
 c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type")
 c.Next()
}

现在，当我执行: swagger generate spec json ./swagger.json来生成我得到的-o规范时：

{
    "consumes": ["application/json", "application/xml"],
    "produces": ["application/json", "application/xml"],
    "schemes": ["http", "https"],
    "swagger": "2.0",
    "info": {
        "description": "the purpose of this application is to provide an application\nthat is using plain go code to define an API\n\nThis should demonstrate all the possible comment annotations\nthat are available to turn go code into a fully compliant swagger 2.0 spec",
        "title": "User API.",
        "termsOfService": "there are no TOS at this moment, use at your own risk we take no responsibility",
        "contact": {
            "name": "John Doe",
            "url": "http://john.doe.com",
            "email": "john.doe@example.com"
        },
        "license": {
            "name": "MIT",
            "url": "http://opensource.org/licenses/MIT"
        },
        "version": "0.0.1"
    },
    "host": "localhost",
    "basePath": "/v2",
    "paths": {
        "/user": {
            "get": {
                "description": "This will show all available pets by default.\nYou can get the pets that are out of stock",
                "consumes": ["application/json", "application/x-protobuf"],
                "produces": ["application/json", "application/x-protobuf"],
                "schemes": ["http", "https", "ws", "wss"],
                "tags": ["listPets", "pets"],
                "summary": "Lists pets filtered by some parameters.",
                "operationId": "users",
                "security": [{
                    "api_key": null
                }, {
                    "oauth": ["read", "write"]
                }],
                "responses": {
                    "200": {
                        "$ref": "#/responses/someResponse"
                    },
                    "422": {
                        "$ref": "#/responses/validationError"
                    },
                    "default": {
                        "$ref": "#/responses/genericError"
                    }
                }
            }
        }
    },
    "definitions": {}
}

请注意，我的定义是空的，不确定为什么。如果我在http://editor.swagger.io/#/中粘贴相同的json规范，它会显示

Error
 Object
message:  "options.definition is required"
code:  "UNCAUGHT_SWAY_WORKER_ERROR"

任何关于生成swagger文档的正确方法的指导都会有所帮助。

Answer 1

这是因为go-swagger无法检测到您的定义的使用情况。我假设您总是有一个结构来描述参数，并且这些参数将始终使用正在使用的定义。如果你能把这个问题作为一个问题提交给你的示例程序，那就太好了。我会把它添加到我的测试中。