我遇到了将Go代码拆分为多个文件的问题。

huangapple
go评论128阅读模式
英文:

Having trouble splitting go code in multiple files

问题

我有两个文件main.go和group.go...大致如下所示：

  1. package main
  3. import (
  4. 	"github.com/gin-gonic/gin"
  5. 	"net/http"
  6. )
  8. func main() {
  9. 	// 创建一个带有默认中间件（logger和recovery）的gin路由器
  10. 	router := gin.Default()
  12. 	v1 := router.Group("/v1")
  13. 	{
  14. 		v1.GET("/", func(c *gin.Context) {
  15. 			c.JSON(http.StatusOK, "{'sup': 'dup'}")
  16. 		})
  18. 		groups := v1.Group("/groups")
  19. 		{
  20. 			groups.GET("/", groupIndex)
  22. 			groups.GET("/:id", groupShow)
  23. 			groups.POST("/", groupCreate)
  24. 			groups.PUT("/:id", groupUpdate)
  25. 			groups.DELETE("/:id", groupDelete)
  26. 		}
  27. 	}
  29. 	// 监听并在0.0.0.0:8080上提供服务
  30. 	router.Run(":3000")
  31. }

所以groupIndex、groupCreate、groupUpdate等方法位于routes/group.go文件中：

  1. package main
  3. import (
  4. 	"strings"
  5. 	"github.com/gin-gonic/gin"
  6. )
  9. func groupIndex(c *gin.Context) {
  10. 	var group struct {
  11. 		Name        string
  12. 		Description string
  13. 	}
  15. 	group.Name = "Famzz"
  16. 	group.Description = "Jamzzz"
  18. 	c.JSON(http.StatusOK, group)
  19. }
  21. func groupShow(c *gin.Context) {
  22. 	c.JSON(http.StatusOK, "{'groupShow': 'someContent'}")
  23. }
  25. func groupCreate(c *gin.Context) {
  26. 	c.JSON(http.StatusOK, "{'groupShow': 'someContent'}")
  27. }
  29. func groupUpdate(c *gin.Context) {
  30. 	c.JSON(http.StatusOK, "{'groupUpdate': 'someContent'}")
  31. }
  33. func groupDelete(c *gin.Context) {
  34. 	c.JSON(http.StatusOK, "{'groupDelete': 'someContent'}")
  35. }

但是当我尝试编译时，出现以下错误：

  1. stuff/main.go:21: undefined: groupIndex
  2. stuff/main.go:23: undefined: groupShow
  3. stuff/main.go:24: undefined: groupCreate
  4. stuff/main.go:25: undefined: groupUpdate
  5. stuff/main.go:26: undefined: groupDelete

我对Go语言非常陌生，但我认为如果将文件放在同一个包中，它们应该可以相互访问。我在这里做错了什么？

英文:

I have two files main.go and group.go... it looks something like this

  1. package main
  3. import (
  4. 	"github.com/gin-gonic/gin"
  5. 	"net/http"
  6. )
  8. func main() {
  9. 	// Creates a gin router with default middlewares:
  10. 	// logger and recovery (crash-free) middlewares
  11. 	router := gin.Default()
  13. 	v1 := router.Group("/v1")
  14. 	{
  15. 		v1.GET("/", func (c *gin.Context) {
  16. 			c.JSON(http.StatusOK, "{'sup': 'dup'}")
  17. 		})
  19. 		groups := v1.Group("/groups")
  20. 		{
  21. 			groups.GET("/", groupIndex)
  23. 			groups.GET("/:id", groupShow)
  24. 			groups.POST("/", groupCreate)
  25. 			groups.PUT("/:id", groupUpdate)
  26. 			groups.DELETE("/:id", groupDelete)
  27. 		}
  28. 	}
  30. 	// Listen and server on 0.0.0.0:8080
  31. 	router.Run(":3000")
  32. }

So the methods groupIndex, groupCreate, groupUpdate, etc are located in another file under routes/group.go

  1. package main
  3. import (
  4.   "strings"
  5.   "github.com/gin-gonic/gin"
  6. )
  9. func groupIndex(c *gin.Context) {
  10.   var group struct {
  11.     Name string
  12.     Description string
  13.   }
  15.   group.Name = "Famzz"
  16.   group.Description = "Jamzzz"
  18.   c.JSON(http.StatusOK, group)
  19. }
  21. func groupShow(c *gin.Context) {
  22.   c.JSON(http.StatusOK, "{'groupShow': 'someContent'}")
  23. }
  25. func groupCreate(c *gin.Context) {
  26.   c.JSON(http.StatusOK, "{'groupShow': 'someContent'}")
  27. }
  29. func groupUpdate(c *gin.Context) {
  30.   c.JSON(http.StatusOK, "{'groupUpdate': 'someContent'}")
  31. }
  33. func groupDelete(c *gin.Context) {
  34.   c.JSON(http.StatusOK, "{'groupDelete': 'someContent'}")
  35. }

But when I try to compile I get the following error

  1. stuff/main.go:21: undefined: groupIndex
  2. stuff/main.go:23: undefined: groupShow
  3. stuff/main.go:24: undefined: groupCreate
  4. stuff/main.go:25: undefined: groupUpdate
  5. stuff/main.go:26: undefined: groupDelete

I'm super new to go, but I thought if you put files in the same package, then they'll have access to each other. What am I doing wrong here?

答案1

得分: 3

有两种方法可以修复这个问题：

  1. 将group.go移动到与main.go相同的目录中。

  2. 将group.go作为一个包导入。将group.go中的包声明改为：

    package routes // 或者你选择的名称

通过以大写字母开头来导出函数：

  1. func GroupIndex(c *gin.Context) {

从main中导入该包：

  1.  import "path/to/routes"
  2.  ...
  3.  groups.GET("/", routes.GroupIndex)

文档如何编写Go代码对此进行了更详细的解释。

英文:

There are two ways to fix this:

  1. Move group.go to the same directory as main.go.

  2. Import group.go as a package. Change the package declaration on group.go to:

    package routes // or the name of your choice

Export the functions by starting them with a capital letter:

  1. func GroupIndex(c *gin.Context) {

Import the package from main:

  1.  import "path/to/routes"
  2.  ...
  3.  groups.GET("/", routes.GroupIndex)

The document How To Write Go Code explains this and more.

huangapple
  • 本文由 发表于 2015年6月28日 05:30:20
  • 转载请务必保留本文链接：https://go.coder-hub.com/31093706.html
  • go
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