Polarion Velocity Script adding a custom field integer - velocity

Question

I'm new to Velocity scripting and made a few simple scripts and they work ok.
I'm now trying something else, which should be simple but I can't seem to get it to work.
I'm selecting a bunch of Work Items, reading a custom field (NumberPack) and I just want to sum them.
My script is as follow:
#set($PCR = $transaction.workItems.search.query("type:Paramrequest AND created:[20220101 TO 30000000] AND NumberPack.1:[00000000001 TO 02147483647]"))
#set($Total = 0)
#set($Pack = 0)
#set($x = 0)
#foreach($PCR in $PCR)
##set($Pack = $Pack.parseInt($PCR.fields.get("NumberPack")))
##set($x = $Total.add($Pack))
$PCR.fields.get("NumberPack").render ## this renders each NumberPack of each WI
#set($Pack = $PCR.fields.get("NumberPack"))
##set($x = $Total2.add($PCR.fields.get("NumberPack")))
##set($Total2 = $Total2 + 1)
#set($x = $math.add($x, 1))
#end
<br> Total: $Total
<br> $x
As you can see I tried a few methods but I keep getting the total 0.
Any ideas what I'm doing wrong?
Thanks

Answer 1

If you write
#set($Pack = $PCR.fields.get("NumberPack"))
Pack: $Pack <br>
the output is something like:
Pack: com.polarion.alm.server.api.model.fields.ProxyIntegerField#67807d51
In the API Javadoc (https://almdemo.polarion.com/polarion/sdk/doc/javadoc-rendering/com/polarion/alm/shared/api/model/fields/IntegerField.html), you'll find that api.model.fields IntegerField has a get() method, which gives you the value. Though I agree this is never explicitly stated in the documentation.
You need to write
#set($Pack = $PCR.fields.get("NumberPack").get())
to get the value. The following statement will give you the cumulative sum.
#set($Total = $math.add($Total, $PCR.fields.get("NumberPack").get()))
Also be careful with your #foreach statement. In this case it seems to work, but it would be safer to give your iterator variable a name differing from the collection you are iterating through. For example:
#foreach($PCR in $PCRs)