英文:
Golang: generating core failed: unable to load github.com
问题
我安装了golang，并从这个教程开始：https://www.howtographql.com/graphql-go/1-getting-started/
当我运行：
go run github.com/99designs/gqlgen generate
我得到了以下错误：
reloading module info
generating core failed: unable to load github.com/my-user/hackernews/graph/model - make sure you're using an import path to a package that exists
exit status 1
我的设置有什么问题？这是我的gopath：
/Users/my-pc-user/go
英文:
I installed golang and started with this tutorial: https://www.howtographql.com/graphql-go/1-getting-started/
When I run:
go run github.com/99designs/gqlgen generate
I get:
reloading module info
generating core failed: unable to load github.com/my-user/hackernews/graph/model - make sure you're using an import path to a package that exists
exit status 1
What is wrong with my setup?
This is my gopath
/Users/my-pc-user/go
答案1
得分: 0
TLDR
$ cd 你的项目路径/
$ print '// +build tools\npackage tools\nimport _ "github.com/99designs/gqlgen"' | gofmt > ./tools.go
$ echo 'package model' | gofmt > ./graph/model/doc.go
$ go get .
Explanation
根据快速入门指南，你应该创建一个包含已经被服务器导入的生成代码的包：
package main
import (
"log"
"net/http"
"os"
"github.com/99designs/gqlgen/graphql/handler"
"github.com/99designs/gqlgen/graphql/playground"
"你的模块名/graph"
"你的模块名/graph/generated"
)
由于你的模块名/graph/generated没有*.go文件，你无法启动服务器，如果尝试启动，会出现以下错误：
graph/schema.resolvers.go:10:2: no required module provides package 你的模块名/graph/generated; to add it:
要生成该包，你需要执行go run github.com/99designs/gqlgen generate，但是还有另一个问题：gqlgen生成的代码使用了另一个尚不存在的包，即你的模块名/graph/model。
为了在生成过程中不丢失间接依赖项，需要额外添加build约束。这就是第一步使用下划线导入的原因。
如果你将任何带有package指令的*.go文件放入该目录中，现在应该一切正常：
$ cd 你的项目路径/
$ print '// +build tools\npackage tools\nimport _ "github.com/99designs/gqlgen"' | gofmt > ./tools.go
$ echo 'package model' | gofmt > ./graph/model/doc.go
$ go get .
英文:
TLDR
$ cd your_project_path/
$ print '// +build tools\npackage tools\nimport _ "github.com/99designs/gqlgen"' | gofmt > ./tools.go
$ echo 'package model' | gofmt > ./graph/model/doc.go
$ go get .
Explanation
According to a quick start guide, you should create a package with generated code that actually is already imported by your server:
package main
import (
"log"
"net/http"
"os"
"github.com/99designs/gqlgen/graphql/handler"
"github.com/99designs/gqlgen/graphql/playground"
"your_module_name/graph"
"your_module_name/graph/generated"
)
Because of the fact that your_module_name/graph/generated has no *.go files you cannot start a server and if you try you will get an error like:
graph/schema.resolvers.go:10:2: no required module provides package your_module_name/graph/generated; to add it:
To generate that package you will need to execute go run github.com/99designs/gqlgen generate, but there is another problem: gqlgen generates code that uses another package that is still doesn't exist yet, i.e. your_module_name/graph/model.
Additional step adding build constraints is required to not drop indirect dependency while generation process. That's why there is the first step with underscore import.
And if you put any *.go file to that directory with package directive — everything should works now:
$ cd your_project_path/
$ print '// +build tools\npackage tools\nimport _ "github.com/99designs/gqlgen"' | gofmt > ./tools.go
$ echo 'package model' | gofmt > ./graph/model/doc.go
$ go get .
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