Golang assigning struct to another struct field not working

I am trying to use Gorp to get all gym classes. Gym classes have a class type so I run a second query to retrieve them. I get all the class types back, but the final assingment is not working for some reason.

package entities

import (
	"fmt"
	"github.com/coopernurse/gorp"
	"time"
)

type Class struct {
	Id                int
	ClassTypeId       int
	ClassType         ClassType
	VideoPath         string
	VideoSize         int
	Duration          float64
	CreatedAt         time.Time
	VisibleAt         time.Time
	NoLongerVisibleAt time.Time
}

func LatestClasses(dbmap *gorp.DbMap) *[]Class {
	var classes []Class
	query := "SELECT * FROM Class"

	_, err := dbmap.Select(&classes, query)
	if err != nil {
		panic(err)
	}

	for _, class := range classes {
		classTypeForClass(dbmap, &class)
	}

	return &classes
}

func classTypeForClass(dbmap *gorp.DbMap, class *Class) {
	var classType ClassType
	query := "SELECT * FROM ClassType "
	query += "WHERE Id=?"

	err := dbmap.SelectOne(&classType, query, class.ClassTypeId)
	if err != nil {
		panic(err)
	}
	fmt.Println(classType) <<<<<<<<<<< Lists Yoga, Pilates etc.
	class.ClassType = classType <<<<<<<< Seemingly does nothing
}

UPDATE

The ClassType struct looks like this:

package entities

import (
	"time"
)

type ClassType struct {
	Id           int
	Code         string
	Name         string
	InstructorId int
	CreatedAt    time.Time
}

ANOTHER UPDATE

I display the data as follows:

<h1>
	Latest Classes
</h1>
<hr/>


{{ range .}}
	{{.VideoPath}}
	<br>
	{{.ClassType.Name}}
	<br>
	{{.VideoSize}}
	<br>
	{{.Duration}}
	<br>
	{{.CreatedAt}}
	{{.NoLongerVisibleAt}}
<br><br>
{{end}}

The assignment works properly, but you are not assigning it to the proper object:
In your loop

> for _, class := range classes {
> classTypeForClass(dbmap, &class)
> }

class is a copy of the elements in the classes slice. Your classTypeForClass(dbmap, &class) properly assigns the class to this copy and the copy is discarded at the end of the loop body.

Try something like

for i := range classes {
    classTypeForClass(dbmap, &(classes[i]))
}

or maybe nicer: Have classTypeForClass return the class and just assign it like

for i := range classes {
    classes[i].ClassType = classTypeForClass(dbmap, &(classes[i]))
}

(Maybe even passing class as a value, not as a pointer.)