Use functions of other files is other directories Golang [closed] - go

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I want to use a method that is in a folder called "controllers" inside my main method, but it turns out that when I start the program it says that the function is not found or defined, I tried following the package guide in the Golang documentation but with the Go build and Go install this did not work, I would like to know only how to use files that are inside other folders to be able to have more order, here the codes and my file tree, first: UserController.go, here is the funcionLoadRecordsFromFile()... (Repeat... i tried using the go build and go install from the documentation but dont work...)
package main
import (
"net/http"
"log"
)
func LoadRecordsFromFile(w http.ResponseWriter, r *http.Request) {
// Maximum upload of 10 MB files
r.ParseMultipartForm(10 << 20)
}
Here is my main.Go were i want to use the function LoadRecordsFromFile() from UserController.go
package main
import (
"net/http"
"github.com/go-chi/chi"
"log"
)
func main() {
r := chi.NewRouter()
r.Post("/loadUsers", func(w http.ResponseWriter, r *http.Request) {
LoadRecordsFromFile(w,r)
})
log.Print("Server started in port 3000")
http.ListenAndServe(":3000", r)
}
The archives are...
-GolangProject
-Main.go
-controllers
--UserController.go

Answer 1

You need to make some changes in your code.
At first, you need to change your package name in your UserController.go. Lets just use controllers as package.
package controllers
import (
"net/http"
"log"
)
func LoadRecordsFromFile(w http.ResponseWriter, r *http.Request) {
// Maximum upload of 10 MB files
r.ParseMultipartForm(10 << 20)
}
Then your Main.go needs some changes.
package main
import (
"net/http"
"github.com/go-chi/chi"
"log"
"github.com/Giovanni2414/Truora/controllers"
)
func main() {
r := chi.NewRouter()
r.Post("/loadUsers", func(w http.ResponseWriter, r *http.Request) {
controllers.LoadRecordsFromFile(w,r)
})
log.Print("Server started in port 3000")
http.ListenAndServe(":3000", r)
}
These changes are enough I think.
Some notes:
Only your main file should have package main.
Normally we define package name after our current folder (but it can be different). All the files under same folder must have same package name.
When you use a function that is under a different package, you should import the desired package before you can use that function.
Your imported path should be like this: <project-module-name>/<folder1>/<folder2>/../<final-folder>.
Finally, you should call that function like the following:
package_name.MyFunction()