Sample Go that will serve some data, in a postgres table, as JSON the way Ember Data wants.

contacts.go

package main

import (
	"database/sql"
	"github.com/ant0ine/go-json-rest/rest"
	_ "github.com/lib/pq"
	"log"
	"net/http"
)

func main() {

	api := rest.NewApi()
	api.Use(rest.DefaultDevStack...)
	router, err := rest.MakeRouter(
		rest.Get("/contacts", GetAllContacts),
	)
	if err != nil {
		log.Fatal(err)
	}
	api.SetApp(router)
	log.Fatal(http.ListenAndServe(":3000", api.MakeHandler()))
}

type Contact struct {
	Id          string `json:"id"`
	FirstName   string `json:"first_name"`
	LastName    string `json:"last_name"`
	CompanyName string `json:"company_name"`
	Email       string `json:"email"`
}

type Contacts struct {
	Contacts []Contact `json:"contacts"`
}

func GetAllContacts(w rest.ResponseWriter, r *rest.Request) {

	db, err := sql.Open("postgres", "user=jwo dbname=contacts_development sslmode=disable")
	if err != nil {
		log.Fatal(err)
	}

	rows, err := db.Query("SELECT id, first_name, last_name, email, company_name FROM contacts")

	if err != nil {
		log.Fatal(err)
	}

	contacts := []Contact{}
	for rows.Next() {
		contact := Contact{}
		rows.Scan(&contact.Id, &contact.FirstName, &contact.LastName, &contact.Email, &contact.CompanyName)
		contacts = append(contacts, contact)
	}

	contactRoot := Contacts{}
	contactRoot.Contacts = contacts

	w.WriteJson(&contactRoot)
}