golang模块和本地包

Question

I'm trying to understand how to organize my golang project using go1.11 modules. I tried several options, but none of them worked.

I have a some code in the main package, ander application folder, and a local package that the main package uses.

$GOPATH
+ src
  + application/
    + main/
      + main.go
      + otherFileUnderMainPackage.go
    + aLocalPackage/
      + someCode.go
      + someCode_test.go
      + someMoreCode.go
      + someMoreCode_test.go

Files in the main package, imports ../aLocalPackage. When I compile by go build main/*.go it's working.

Then, I ran go mod init application:V.0.9.9 and got the go.mod file, but the build always fails. I always get error about not finding the local package: build application:V0.9.9/main: cannot find module for path _/.../src/application/aLocalPackage. I also tried to place the local package right under src/, place it under main/ etc. but none of these method worked for me.

What is the way to use modules and local packages?

Thanks.

Answer 1

Relative import paths are not supported in module mode. You will need to update your import statements to use a full (absolute) import path.

You should also choose a module name other than application. Your module path should generally begin with a URL prefix that you control — either your own domain name, or a unique path such as github.com/$USER/$REPO.