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Tables creation:

product

id | primary key, unsigned, integer
kd_barang | unique, nullable, FK constraint
nama_roti
harga
timestamps()

transaksi

id_transaksi | primary key, varchar
kd_barang | FK Constraint to product table
jumlah
harga satuan
total_harga
timestamps

Relationships:

App\Product

 public function transaction()
    {
        return $this->hasMany(Transaction::class, 'kd_barang');
    }

App\Transaction

        protected $table = 'transaksi';
    protected $primaryKey = 'id_transaksi';
    protected $fillable = ['kd_barang', 'jumlah' , 'harga_satuan', 'total_harga'];
    public $incrementing = false;

public function product()
    {
        return $this->belongsTo(Product::class, 'kd_barang');
    }

<a href="https://imgur.com/UZY6hJK"><img src="https://i.imgur.com/UZY6hJK.png" title="source: imgur.com" /></a>