在Middleman构建期间清理yaml数据

I have some data in a yaml file. I want to calculate some values from this data, which I’ll then use in pages built from a template. So far I’ve been doing this sort of calculation in helpers but it involves a lot of repetition (e.g. the same calculation is made multiple times for one page) and is really a misuse of helpers.I have some data in a yaml file. I want to calc