independentstrorage.go

//NOte you can easily swap the storage for your database without changing much of the code
package main

import (
	"fmt"
)

type user struct {
	first string
}

type mongo map[int]user

type hardrive map[int]user

func (m mongo) save(n int, u user) {
	m[n] = u
}

func (m mongo) retrieve(n int) user {
	return m[n]
}

func (hd hardrive) save(n int, u user) {
	hd[n] = u
}

func (hd hardrive) retrieve(n int) user {
	return hd[n]
}

type accessor interface {
	save(n int, u user)
	retrieve(n int) user
}

func put(a accessor, n int, u user) {
	a.save(n , u)
}

func get ( a accessor, n int) user {
	return a.retrieve(n)
}
func main() {
	storage := mongo{}

	p1 := user {
		first: "Ula Britta Smita Frita",
	}

	p2 := user {
		first: "Joergen Smorgen",
	}

	put(storage, 1, p1)
	put(storage, 2, p2)

	fmt.Println(get(storage, 1), "\n", get(storage, 2), "\n")
	
}