counting field from business object to use in a pie chart

Summary

counting a field from BO and showing it in a pie chart

Content

Hi all,

 

At the moment we are using a pie chart to provide some information about our business object.

Application: We are uploading files, which contains information about the file size, who uploaded it (customer), upload date etc.
Now we want to count the total amount of files that has been uploaded by that user. ​ 

What is the best way to provide this in a pie chart? Besides aggregating this in a seperate field in a BO.

 

Thanks in advance!

Moenish