O relacionamento Associação has_many :through esta correto nesta situação?

gistfile1.rb

class User < ActiveRecord::Base
	has_many :sales
	has_many :products, :through => :sales
end

class Sale < ActiveRecord::Base
	belongs_to :product
	belongs_to :user
end

class Product < ActiveRecord::Base
	has_many :sales
	has_many :users, :through => :sales 	
end

gistfile2.erb

<% @sales.each do |sale| %>
      <tr>
        <td><%= sale.product.name %></td>
        <td><%= sale.quantity %></td>
        <td><%= sale.user.email %></td>
        <td><%= link_to 'Show', sale %></td>
        <td><%= link_to 'Edit', edit_sale_path(sale) %></td>
        <td><%= link_to 'Destroy', sale, method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
<% end %>