How to use JSONB

[Izopi4a]

hi, i do not understand how to work with JSON columns. I have this struct

type User struct {
	ID        int               `json:"id"`
	FirstName string            `json:"first_name"`
	LastName  string            `json:"last_name"`
	Email     string            `json:"email"`
	Password  string            `json:"password"`
	Roles     pgtype.JSONBCodec `json:"roles"`
}

in my database those are my fields 1 to 1, id is int, roles is jsonb , rest are varchar

Here is my Create statement

func CreateUser(ctx context.Context, u User) (User, error) {
	var id int
	err := db.Pool().QueryRow(ctx, `
		INSERT INTO "user" (first_name, last_name, email, password, roles) 
		VALUES ($1, $2, $3, $4, $5) RETURNING id`, u.FirstName, u.LastName, u.Email, u.Password, u.Roles).Scan(&id)
	if err != nil {
		return User{}, err
	}
	u.ID = id
	return u, nil
}

i would like to insert this

var user models.User
user.Email = email

var ur models.UserRole
ur.Name = []string{"ROLE_USER"}

user.Roles.Marshal(&ur)

user, err = models.CreateUser(c.Request.Context(), user)

type UserRole struct {
	Name []string `json:"name"`
}

func (ur *UserRole) MarshalJSON() ([]byte, error) {
	//return []byte(`"` + ur.Name + `"`), nil

	var str string

	for i := range ur.Name {
		str += `"` + ur.Name[i] + `",`
	}

	str = str[:len(str)-1]
	return []byte(`["` + str + `"]`), nil
}

Obviously, i am doing something wrong if you could help me and tell me what I am doing wrong. I would like to store my data as such in the table
["ROLE_USER","ROLE_ADMIN"] or just ["ROLE_USER"]

[Izopi4a]

in case someone wonders the same

type User struct {
	ID        int        `json:"id"`
	FirstName string     `json:"first_name"`
	LastName  string     `json:"last_name"`
	Email     string     `json:"email"`
	Password  string     `json:"password"`
	Roles     []UserRole `json:"roles"`
}

type UserRole struct {
	Name string `json:"name"`
}

func (ur UserRole) MarshalJSON() ([]byte, error) {
	return []byte(`"` + ur.Name + `"`), nil
}

func (ur *UserRole) UnmarshalJSON(b []byte) error {
	ur.Name = string(b[1 : len(b)-1])
	return nil
}

var user models.User
		user.Email = email

		role := models.UserRole{Name: "ROLE_USER"}

		user.Roles = append(user.Roles, role)

than select and iserts work great