List operation in FEEL

[si...@zambrovski.org]

Hi Folks,

I'm playing around with the new DMN Engine and trying to understand what part of the FEEL is already implemented. I'm interested in the list operations. Can I express the following checks, imageine X is bound to a column of the decision table:

- list X is empty
- list X contains element A
- list X is a subset of a list with element A
- list X is a subset of a list with elements A and B

Thanks a lot and kind regards,

Simon

[Sebastian Menski]

Hi Simon,

currently our FEEL "implementation" is only supported for input entries. Which corresponds to FEEL grammar rule 14 "simple unary tests". We don't have a

implementation for simple expression.

To solve your use case you can use JUEL as expression language. So you can use normal Java Functions like contains.

Cheers,

Sebastian

[Bernd Rücker]

Hi Simon.

 

Sebastian showed me a trick to extend the FEEL -> JUEL transformation to allow introducing own operators. Maybe not the “final” solution but a nice workaround if required:

https://github.com/camunda/camunda-consulting/tree/master/snippets/dmn-collection-contains

 

Allows to check for containment in a list of “Vorerkrankungen”:

 

 

Cheers

Bernd

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