% Discount provider - show saving on each orderline

Martin Nielsen

Posted on 21/07/2011 09:02:33

Hi,

I've created a SalesDiscountProvider that applies a 20% discount based on a custom voucher code.
When my Provider is run i can extend the order inside the "ProcessOrder" and i've added an extra Orderline containing info about the discount.

What i need now is to calculate the discount pr. orderline, and update the unitprice to make the math work.

Inside the "ProcessOrder" i do this, but my price isn't updated when viewing the card:

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Martin Nielsen

Posted on 21/07/2011 09:02:51

// Loop all orderlines and substract vouchervalue percentage
foreach ( OrderLine oLine in order.OrderLines )
{
  // Calculate amount saved pr. row
  double rowUnitPrice = oLine.UnitPrice.Price;
  double discPrice = rowUnitPrice * discountpercent;
  double newRowPrice = rowUnitPrice - discPrice;
  // Set new unit price
  oLine.SetUnitPrice( newRowPrice );
  
  if ( oLine.OrderLineFieldValues != null ) {
    // Save "Discount amount" to customfield.
    if ( oLine.OrderLineFieldValues.Count > 0 ) {
      foreach ( OrderLineFieldValue fVal in oLine.OrderLineFieldValues )
      {
        if ( fVal.OrderLineFieldSystemName.Equals( "DiscountValue" ) )
        {
          fVal.Value = discPrice.ToString();
          break;
        }
      }
    } else {
      OrderLineFieldValue olv = new OrderLineFieldValue( "DiscountValue", discPrice.ToString() );
      oLine.OrderLineFieldValues.Add( olv );
    }
  }
  oLine.Save(oLine.ID);
}

Martin Nielsen

Posted on 21/07/2011 09:05:24

Am i doing it wrong, or in the wrong place?

Any advice is appreciated.

Regards
Martin

PS. Code insertion doesn't work very well. It doesn't insert the codesnippet where the cursor was, instead it's places as the first thing inside the editor. (Sitting in IE9).

Imar Spaanjaars

Posted on 21/07/2011 10:43:00

Yes, the editor has some major usability issues. I already reported it, and a backlog item has been added to TFS. Hopefully this gets addressed real soon.

AFAIK, you shouldn't update the price of each item. Instead you need to create a new order line of type discount with a value that equals the combined discount of all products. You may want to take a look at the documentation here: http://developer.dynamicweb-cms.com/documentation/for-developers/ecommerce/sales-discount-providers.aspx for an example.

Cheers,

Imar

Martin Nielsen

Posted on 21/07/2011 10:54:17

Hi Imar,

That is how it works now, but our client would like to have the discount pr. orderline.
Is this at all possible?

Shouldn't oLine.SetUnitPrice( newRowPrice ); update the price on the orderline?

// Martin

Imar Spaanjaars

Posted on 21/07/2011 11:03:47

AFAIK, no. The discount is calculated again each time the cart is shown and if I am not mistaken, it always takes the actual product prices into account.

What you could do is use an OrderLineTemplateExtender and make it *appear* as if prices have changed. The actual order discount will still be added as a separate line in the OrderLines table though....

Hope this helps,

Imar

Martin Nielsen

Posted on 21/07/2011 11:27:32

I was thinking down that path aswell, but it doesn't feel like the right way to go.

I hope our client can live without this feature.

// Martin

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% Discount provider - show saving on each orderline

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