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CDS annotation to calculate projection view virtual element

former_member679084
Explorer

‎05-16-2020 9:24 AM

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hi,

can you help me with the annotations on my projection view, as i would like to calculate the flight date via IF_SADL_EXIT_CALC_ELEMENT_READ (Class name is ZAMDP_FLIGHT)

i'm just trying with this exercise but can't seem to activate it due to an error - "Basis entity must have a ROOT property or a TO PARENT association"

https://help.sap.com/viewer/923180ddb98240829d935862025004d6/Cloud/en-US/df0ef4aac2d34fdd948b8a8883d...

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4 REPLIES 4

maheshpalavalli
Active Contributor

‎05-16-2020 9:33 AM

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Are you trying to do it using restful abap programming model or abap programming for fiori?

geert-janklaps
Active Contributor

‎05-16-2020 10:18 AM

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Hi,

I'm not really sure if you can use the @ObjectModel.CompositionRoot as you are doing in zddl_next_flight. Looking at the documentation I would expect only true or false is possible.

You can also have a look at following example, which uses a root and child entity.

https://blogs.sap.com/2019/03/11/creating-a-draft-enabled-sales-order-fiori-app-using-the-new-abap-p...

Best regards,

Geert-Jan Klaps

gasparerdelyi
Active Participant
In response to geert-janklaps

‎05-17-2020 11:07 PM

The example shows the correct modelling with the associations towards child, parent and root and the usage of annotation @ObjectModel.association type. However these are important for transactional processing... virtual elements are quite independent of it, for them you do not necessarily need these annotations.

gasparerdelyi
Active Participant

‎05-17-2020 11:12 PM

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With respect to filter transformation, there is an example on the blog post https://blogs.sap.com/2020/01/16/filtering-on-association-property-in-fiori-element-app-via-abap-cds...

With respect to the calculation exit, there are two ways to code:

  • either you need to take care of reading the data in the CALCULATE method itself. In that case you even need no association for the sake of virtual element calculation
  • or you need to take out the necessary fields from the association into your projection list as in IF_SADL_EXIT_CALC_ELEMENT_READ~GET_CALCULATION_INFO you can only specify fields of your CDS view, not a field of an association. SADL can only warrant to read the input for your calculation as long as they are coming from an element from your CDS view directly.