Dgraph upsert exampe with dgo - Unknown best practices

dgraph_upsert.go

// UpdateProposalCode takes a proposal code and updates it with the provided values
func (s *Storage) UpdateProposalCode(pc proposing.ProposalCode) error {

	//Check if proposal code exists
	//Update that propsal code to include the information in the passed propososalCode type
	pc.UpdatedAt = time.Now()

	q := fmt.Sprintf(`
	query {
		code as var(func: eq(code, %s))
	}`, pc.Code)

	mus := fmt.Sprintf(`
		uid(code) <redeemed> "%s"^^<xs:boolean> .
		uid(code) <updated_at> "%s"^^<xs:date> .
		uid(code) <redeemer>  <%s> .
	`,
		strconv.FormatBool(pc.Redeemed),
		pc.UpdatedAt.Format(time.RFC3339),
		pc.Redeemer)

	mu := &api.Mutation{
		SetNquads: []byte(mus),
		CommitNow: true,
	}
	req := &api.Request{
		Query:     q,
		Mutations: []*api.Mutation{mu},
	}
	ctx := context.Background()
	txn := s.db.NewTxn()

	_, err := txn.Do(ctx, req)
	if err != nil {
		return err
	}

	err = txn.Commit(ctx)
	if err != nil {
		return err
	}

	return nil
}