Go Templates: two or more slices ranges

The next code works perfect for output one slice inside the HomeTemplate.

main.go

type Item struct {
	Id          int
	Name string
	Type      string
}

var tmpl = template.Must(template.ParseGlob("tmpl/*"))

func Index(w http.ResponseWriter, r *http.Request) {

	db := database.DbConn()

	selDB, err := product.ByID()
	if err != nil {
		panic(err.Error())
	}

	i := Item{}

	resItems := []Item{}

	for selDB.Next() {

		var id int
		var product_name, product_type string

		err = selDB.Scan(&id, &product_name, &product_type)
		if err != nil {
			panic(err.Error())
		}

		i.Id = id
		i.Name = product_name
		i.Type = product_type

		resItems = append(resItems, i)

	}

	tmpl.ExecuteTemplate(w, "HomeTemplate", resItems)

	// Close database connection
	defer db.Close()
}

In the template forks fine the next code:

{{ range . }}
    {{ .Name }}<br />
{{ end }}

Why something like this does not work?

{{ range .resItems }}
    {{ .Name }}<br />
{{ end }}

What if I want output two or more slices, what I need to do or change?

Thank you

first question, why rang .resItems doesn't work.
In template, . means current item. like this in java.
if . in some direction like range, it means the item from range operation.
if not, it means the item you passed form ExecuteTemplate() method. like in ExecuteTemplate(w, "HomeTemplate", resItems), . means resItems. so you can not use .resItems because it means resItems have a value called resItems.

second, if you have more slices to pass to template, you can add all of them to a map, like this:

t := template.New("test")
t, _ = t.Parse(`
test range 
{{range .first}} {{.}} {{end}}
{{range .second}} {{.}} {{end}}
`)
var res = make(map[string]interface{})
aa := []string{"first", "second"}
bb := []string{"123", "456"}
res["first"] = aa
res["second"] = bb
t.Execute(os.Stdout, res)

// output
test range
 first  second
 123  456

I have two array aa and bb, and add them to a map then pass it to the template. In template, . means the map, and .first got the array aa. and so as bb.

Hope this can help you...