LED's associations

controller.rb

#How should one chain them ? Product > led_config > led
@products = Product.all
@ledconfig = LedConfiguration.all
@leds = Led.all

model.rb

class Product < ActiveRecord::Base
has_many :led_configurations
has_many  :leds, through: :led_configurations
end

class LedConfiguration < ActiveRecord::Base
belongs_to :product
has_many :leds
end

class Led < ActiveRecord::Base
belongs_to :led_configurations
end

view.html.erb

<td>
<% @leds.each do |l| %>
<%= l.wl %>
<% end %>
</td>