Golang dgo insert node with empty relation create a node with an edge to it

Users Dgraph
1

i have this struct for store a program.

type StoreProgram struct {
	Uid           string       `json:"uid,omitempty"`
	CreatorId     string       `json:"Program.creatorId,omitempty"`
	OwnerId       string       `json:"Program.ownerId,omitempty"`
	Title         string       `json:"Program.title,omitempty"`
	Categories    []string     `json:"Program.categories,omitempty"`
	Publish       bool         `json:"Program.publish,omitempty"`
	CreatedAt     time.Time    `json:"Program.createdAt,omitempty"`
	UpdatedAt     time.Time    `json:"Program.updatedAt,omitempty"`
	Channel       StoreChannel `json:"Program.channel,omitempty"`
	DType         []string     `json:"dgraph.type,omitempty"`
}

my StoreChannel schema is :

type StoreChannel struct {
	Uid           string     `json:"uid,omitempty"`
	CreatorId     string     `json:"Channel.creatorId,omitempty"`
	OwnerId       string     `json:"Channel.ownerId,omitempty"`
	Title         string     `json:"Channel.title,omitempty"`
	Description   string     `json:"Channel.description,omitempty"`
	Publish       bool       `json:"Channel.publish,omitempty"`
	CreatedAt     time.Time  `json:"Channel.createdAt,omitempty"`
	UpdatedAt     time.Time  `json:"Channel.updatedAt,omitempty"`
	Programs      []Program  `json:"Channel.programs,omitempty"`
	DType         []string   `json:"dgraph.type,omitempty"`
}

my problem is when i create a program with follow code my program create a channel while channel is empty

conn := db.(dgo.Dgraph)

	program := StoreProgram{
		Uid:           programObj.Uid,
		CreatorId:     programObj.CreatorId,
		OwnerId:       programObj.OwnerId,
		Title:         programObj.Title,
		Description:   programObj.Description,
		Categories:    programObj.Categories,
		Publish:       false,
		CreatedAt:     time.Now(),
		UpdatedAt:     time.Now(),
		DType:         []string{"Program"},
	}
	
	mu := &api.Mutation{
		CommitNow: true,
	}
	pb, err := json.Marshal(program)
	if err != nil {
		log.Fatal(err)
	}
	mu.SetJson = pb
	_, err = conn.NewTxn().Mutate(c, mu)
	fmt.Println(mu)
	if err != nil {
		log.Fatal(err)
	}
	return nil

Does anyone have an idea how I should solve this issue ?