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：
package main
import (
"github.com/gin-gonic/gin"
"net/http"
)
func main() {
// 创建一个带有默认中间件（logger和recovery）的gin路由器
router := gin.Default()
v1 := router.Group("/v1")
{
v1.GET("/", func(c *gin.Context) {
c.JSON(http.StatusOK, "{'sup': 'dup'}")
})
groups := v1.Group("/groups")
{
groups.GET("/", groupIndex)
groups.GET("/:id", groupShow)
groups.POST("/", groupCreate)
groups.PUT("/:id", groupUpdate)
groups.DELETE("/:id", groupDelete)
}
}
// 监听并在0.0.0.0:8080上提供服务
router.Run(":3000")
}
所以groupIndex、groupCreate、groupUpdate等方法位于routes/group.go文件中：
package main
import (
"strings"
"github.com/gin-gonic/gin"
)
func groupIndex(c *gin.Context) {
var group struct {
Name string
Description string
}
group.Name = "Famzz"
group.Description = "Jamzzz"
c.JSON(http.StatusOK, group)
}
func groupShow(c *gin.Context) {
c.JSON(http.StatusOK, "{'groupShow': 'someContent'}")
}
func groupCreate(c *gin.Context) {
c.JSON(http.StatusOK, "{'groupShow': 'someContent'}")
}
func groupUpdate(c *gin.Context) {
c.JSON(http.StatusOK, "{'groupUpdate': 'someContent'}")
}
func groupDelete(c *gin.Context) {
c.JSON(http.StatusOK, "{'groupDelete': 'someContent'}")
}
但是当我尝试编译时，出现以下错误：
stuff/main.go:21: undefined: groupIndex
stuff/main.go:23: undefined: groupShow
stuff/main.go:24: undefined: groupCreate
stuff/main.go:25: undefined: groupUpdate
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
package main
import (
"github.com/gin-gonic/gin"
"net/http"
)
func main() {
// Creates a gin router with default middlewares:
// logger and recovery (crash-free) middlewares
router := gin.Default()
v1 := router.Group("/v1")
{
v1.GET("/", func (c *gin.Context) {
c.JSON(http.StatusOK, "{'sup': 'dup'}")
})
groups := v1.Group("/groups")
{
groups.GET("/", groupIndex)
groups.GET("/:id", groupShow)
groups.POST("/", groupCreate)
groups.PUT("/:id", groupUpdate)
groups.DELETE("/:id", groupDelete)
}
}
// Listen and server on 0.0.0.0:8080
router.Run(":3000")
}
So the methods groupIndex, groupCreate, groupUpdate, etc are located in another file under routes/group.go
package main
import (
"strings"
"github.com/gin-gonic/gin"
)
func groupIndex(c *gin.Context) {
var group struct {
Name string
Description string
}
group.Name = "Famzz"
group.Description = "Jamzzz"
c.JSON(http.StatusOK, group)
}
func groupShow(c *gin.Context) {
c.JSON(http.StatusOK, "{'groupShow': 'someContent'}")
}
func groupCreate(c *gin.Context) {
c.JSON(http.StatusOK, "{'groupShow': 'someContent'}")
}
func groupUpdate(c *gin.Context) {
c.JSON(http.StatusOK, "{'groupUpdate': 'someContent'}")
}
func groupDelete(c *gin.Context) {
c.JSON(http.StatusOK, "{'groupDelete': 'someContent'}")
}
But when I try to compile I get the following error
stuff/main.go:21: undefined: groupIndex
stuff/main.go:23: undefined: groupShow
stuff/main.go:24: undefined: groupCreate
stuff/main.go:25: undefined: groupUpdate
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：
-
将group.go移动到与main.go相同的目录中。
-
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：
func GroupIndex(c *gin.Context) {
从main中导入该包：
import "path/to/routes"
...
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:
-
Move group.go to the same directory as main.go.
-
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:
func GroupIndex(c *gin.Context) {
Import the package from main:
import "path/to/routes"
...
groups.GET("/", routes.GroupIndex)
The document How To Write Go Code explains this and more.
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