Finding records with two specific records in another table

Question

I have a Product model that has_and_belongs_to_many :taxons, and I want to find all products that are in specific taxons.

For example, if a pro

Answer 1

Assuming performance isn't a requirement:

a = Taxon.find_by_name!('Ruby on Rails').products.pluck(:id)
b = Taxon.find_by_name!('Shirts').products.where(:id => a)