'SumTVs' snippet - how to add current document tv to another document tv?

How might I, in a snippet inserted into a Ditto list template, add the value of a TV from the current document to that of the listed document?

Let’s say the tv I want to sum is called [*tvPrice*].

I’m thinking the Ditto tpl would be something like:


Where:
- [[SumTVs]] is the snippet containing php code to add the two TVs together
- tvPrice is the tv we want to draw data from
- [*id*] is the current document id
- [+id+] is the listed document id

Apparently the math can be done via a fairly straightforward mySql statement but I’m not sure how to begin. I haven’t created a snippet before and know very little php
I’m willing to give it a go if anyone is willing to give me some tips on how to get started. I guess it could be quite a useful little snippet for product bundling, etc

As always, thanks in advance for your help!

Luke

do you want to sum all listet resources together or do you only want to show the sum of current listed resource + main-resource?

the second can you do with phx:

Haha, great!! That’s exactly what I wanted, thanks for your help