Go import loops not allowed

php editor Strawberry is here to introduce an important rule to you: In the Go language, importing loops is not allowed. This means that when writing Go code, we cannot import the current package again within the imported package. This provision is to avoid the problem of circular dependencies and ensure the reliability and maintainability of the code. If we encounter a circular import situation when writing code, we need to re-examine our code structure and consider whether we need to refactor to avoid the occurrence of circular dependencies. By following this rule, we can write more robust and reliable Go code.

Question content

I am a newbie in go and I am learning go. I want this folder structure where model is the database entity, Controller is where the endpoint is, Service is where the actual functionality happens. (The problem is the folder/package structure)

Course
    --- Course.controler.go
    --- Course.model.go
    --- course.service.go

Faculty
    --- Faculty.controller.go
    --- Faculty.model.go
    --- Faculty.service.go

1 Teacher can have 0..* courses so I implemented the foreign key here by importing the teacher package

course.model.go

package course

import (
    "go-server/routes/faculty"

    "gorm.io/gorm"
)

type Course struct {
    gorm.Model
    Name        string          `json:"name"`
    Code        string          `json:"code" gorm:"unique;size:192"`
    Year        int             `json:"year"`
    Description string          `json:"description"`
    FacultyId   int             `json:"faculty"`
    Faculty     faculty.Faculty `gorm:"foreignKey:FacultyId"`
}

Now if I implement a function called

GetCoursesForFacultyID(id) in course.service.go I can't use it on faculty.service due to the import cycle. How can I overcome this problem?

Faculty->Courses->Faculty

Solution

You need to use a different folder structure

Course
    --- Course.controler.go
    --- Course.service.go

Faculty
    --- Faculty.controller.go
    --- Faculty.service.go

Models
    --- Course.model.go
    --- Faculty.model.go

or

School
    --- Course.controler.go
    --- Course.model.go
    --- Course.service.go
    --- Faculty.controller.go
    --- Faculty.model.go
    --- Faculty.service.go

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