trying to use subclass in workflow, but superclass is instantiated

[Florin Wach]

Hi Paul,

you need to have the same constructor's signature on both classes and then you have to use ... in find_by_lpor:


      CREATE OBJECT lo_instance_object TYPE (lpor-typeID)
                    EXPORTING
                       iv_instID = lpor-instID.

      result ?= lo_instance_object.


And you need to redefine the instance method LPOR to return your new subclass' name, so the workflow instantiates the subclass the next time, too.


Have fun, take care,
   Florin


-------- Original-Nachricht --------
> Datum: Wed, 6 Jun 2012 11:17:49 +1000
> Von: Paul.Bakker at osr.qld.gov.au
> An: sap-wug at mit.edu
> Betreff: trying to use subclass in workflow, but superclass is instantiated

> 
> Hello WUG OO experts,
> 
> As time goes on, I'm gradually switching my new workflow developments to
> OO, just to see what the benefits are.
> 
> Anyway, I have just run into a strange problem. I have defined a
> superclass
> ZCl_CLASS and a subclass ZCL_SUB_CLASS.
> 
> The subclass inherits all the methods of the superclass, and you can
> redefine them, which is good. However I've noticed that you can't redefine
> the critical method BI_PERSISTENT~FIND_BY_LPOR, because it is a 'static'
> method.
> 
> This causes a big problem when I start a workflow containing a
> ZCL_SUB_CLASS object, because I've found that FIND_BY_LPOR instantiates an
> object of type ZCL_CLASS in the container!
> 
> The workflow therefore runs into an error when it tries to execute
> ZCL_SUB_CLASS->MY_SUBCLASS_METHOD... it reports that the method does not
> exist.
> 
> I must be doing something wrong.. but what is it?
> 
> merci,
> 
> Paul Bakker
> 
> 
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