slugs.go

package main

import (
	"fmt"
	"strings"
)

type CategoryList struct {
	Categories []Category
}

func (cl CategoryList) GetCategory(id int) Category {
	for _, cat := range cl.Categories {
		if cat.Id == id {
			return cat
		}
	}

	return Category{}
}

type Category struct {
	Name     string
	Id       int
	ParentId int
	Slugs    []string
}

func (cl CategoryList) CategorySlugs(c Category) []string {
	slugs := []string{c.Name}
	parentId := c.ParentId
	for {
		cat := cl.GetCategory(parentId)
		if cat.Id == 0 {
			break
		}
		parentId = cat.ParentId
		slugs = append([]string{cat.Name}, slugs...)
	}

	return slugs
}

func (cl CategoryList) CategoryUrl(cat Category) string {
	slugs := cl.CategorySlugs(cat)
	return strings.Join(slugs, "/")
}

func main() {
	cl := CategoryList{[]Category{
		{"Clothing", 1, 0, []string{}},
		{"Lingerie", 2, 0, []string{}},
		{"Jackets", 3, 1, []string{}},
		{"Shorts", 4, 1, []string{}},
		{"Bras", 5, 2, []string{}},
		{"Briefs", 6, 2, []string{}},
	}}

	for _, cat := range cl.Categories {
		fmt.Println(cl.CategoryUrl(cat))
	}
}