Grouped Bar Chart Displaying Cross Tab Between Groups

I'm trying to make a group bar chart that gives the frequency of two group combos. I referred to this site for rollup and nest function reference: http://bl.ocks.org/phoebebright/r

Solution 1:

The moment you use the nest generator you don't have drug_cat and count as properties anymore: you have key and values (or value for the inner arrays).

Here is your block builder changing the names of those properties: https://blockbuilder.org/GerardoFurtado/f4c825a5f8c92e87cc5a81591ba1f7c9