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

I had this problem a while back, thankfully there is a nice solution.

def self.has_taxons(taxons)
  id = arel_table[:id]
  Product.joins(:taxons).where(taxons: { name: taxons }).group(id).having(id.count.eq(taxons.size))
end