Put a size quota for each model

[zakriabilal]

I'm trying to make it where each instance of my model can upload any number of files but limited to let's say 20MB in total. There is a function onlyKeepLatest which allows us to limit the number of files per model but not by file size.

So It could be either 1 file that is 20MB or 30 files totalling 20MB.

Right now I'm handling this in the controller by calling a separate class that queries the DB using the getMedia and then calculates the total size currently used by summing the size column.

So, I'm wondering what would be the best place to handle this?

Is there a better way to handling this? Please note I need to use this with like 20 different types of models.