Order parent model using children in rails

Question

I have model product and vote, I need to order products by votes count DESC.

product has_many :votes, vote belongs_to :product

index_controller.rb

def index
  @products = Product.all
end

Answer 1

@products = Product.order("count(votes) DESC")

If you have not votes column then use:

@products = Product.all.sort { |a, b| b.votes.count <=> a.votes.count   }