不久前我遇到了这个问题，幸好有一个很好的解决方案.

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