A frequent question I’m asked is “Why isn’t my discount applying?”  The best way to troubleshoot a discount issue is to use pipeline logging in conjunction with the tracing feature of the OrderDiscount component.  Remember that you should only use this for troubleshooting, preferably on a test system as logging and tracing will slow down your site.

 

 There are many issues that could prevent a discount from applying including date ranges of the campaign item, active status (approval status), interactions with other discounts, and expressions not evaluating as expected. 

 

First, turn on pipeline logging for the basket pipeline by editing the pipelines section of your web.config:

 

    <pipelines>

       <pipeline name="basket"

                 path="pipelines\basket.pcf"

                 transacted="false"

                 type="OrderPipeline"

                 loggingEnabled="true" />

 

Next, set the “_Trace_Discounts” key in the pipeline context dictionary (or PipelineInfo["_trace_discounts"] =1;) before executing the basket pipeline.  If you are using the StarterSite, you’ll need to edit the code for CommerceComponents.dll.  In ControlLibrary\Helpers\BasketHelper.cs the RunPipeline() function:

 

 

    private PipelineExecutionResult RunPipeline(string pipelineName, OrderPipelineType type)

    {

        // [snip]

 

        using (PipelineInfo pipeline = new PipelineInfo(pipelineName, type))

        {

            pipeline["_trace_discounts"] = 1;

 

            // [snip]

 

            return basket.RunPipeline(pipeline);

    }

 

Now when the basket pipeline runs, it will output a trace of the discount algorithm in the “_discounts_trace_info” key.

 

So browse to the site and checkout a basket that qualifies for the discount you’re troubleshooting.  Now open the pipeline log (it should be under your pipeline files, C:\Inetpub\wwwroot\StarterSite\pipelines\log, make sure your IIS worker process has permission to write here) to see trace information for each discount that is loaded into the runtime cache and the expressions that were evaluated, etc.  It should look something like:

 

RootObject:   WriteValue    _discounts_trace_info      VT_NULL       __null__      VT_BSTR       Discount tracing session started at: 1/19/2007 1:53:06 PM

 

        Total number of discounts: 3

        Basket contains: 1 lines

 

        No TargetingProfiles dictionary. Using legacy userprofile and contextprofile keys.

 

        No context profile.

 

        No user profile.

 

        Sorted discounts:

               0. Id = 1

                      BUY 1.00(q), CondExprId=1; GET 1 at 100.00(%), AwardExprId=1 ; OL=0, Djoint=-1, CC=0, CA=0, AC=0, AA=0

               1. Id = 5

                      BUY 1.00(q), CondExprId=0; GET 1 at 20.00(%), AwardExprId=2 ; OL=0, Djoint=0, CC=0, CA=0, AC=0, AA=0

               2. Id = 8

                      BUY 40.00($), CondExprId=0; GET 1 at 100.00(%), AwardExprId=0 ; OL=-1, Djoint=0, CC=0, CA=0, AC=0, AA=0

 

               Basket line 0; Disc 1; Condition Expression 1 = true

               Basket line 0; Disc 1; Award Expression 1 = true

               Basket line 0; Disc 5; Award Expression 2 = false

 

        Running engine for discount Id = 1

 

               Discount_Id=1: Basket lines sorted for conditions

                      0: Basket line index 0

 

               Discount_Id=1: Basket lines sorted for awards

                      0: Basket line index 0

 

 

        Discount Id = 1 is a winner.

 

        Running engine for discount Id = 5

 

               Discount_Id=5: Basket lines sorted for conditions

                      0: Basket line index 0

 

               Discount_Id=5: Basket lines sorted for awards

                      0: Basket line index 0

 

 

        Discount Id = 5 is not a winner.

 

        Running engine for discount Id = 8

 

               Discount_Id=8: Basket lines sorted for conditions

                      0: Basket line index 0

 

               Discount_Id=8: Basket lines sorted for awards

                      0: Basket line index 0

 

 

        Discount Id = 8 is not a winner.

 

Now you should have enough information to figure out why the wrong discount was given, an eligibility requirement wasn’t met, or whatever else is keeping your discount from applying. 

 

If your discount isn’t in the "Sorted discounts" part of the trace, it means that it is not currently active.  Double check that:

·         The discount is not deleted

·         The discount is active (approved)

·         The parent campaign is active (approved)

·         The current date is between the discount’s StartDate and EndDate

 

Good luck!

David