public function addToCart($productid, $price, $quantity)
	{
		// check if the product already exists in the cart.
		// if it does, add the quantities together
		$productAlreadyExists = 0;
		$olderProduct = ShoppingCartItem::where('product_id', '=', $productid)->where('user_id', '=', Auth::user()->id)->first();
		if($olderProduct != null) {
			$productAlreadyExists = $olderProduct->qty;
			$olderProduct->qty += $quantity;
			$olderProduct->save(); 
		} else {
			$item = new ShoppingCartItem;
			$item->user_id = Auth::user()->id;
			$item->product_id = $productid;
			$item->price = $price;
			$item->qty = $quantity;
			$item->save();
		}
	}