Ruby on Rails

i add curl --silent http://localhost:3000/products/3/who_bought -H
"Accept: application/xml"

show error: <h1>
NoMethodError
in ProductsController#who_bought
</h1>
<pre>undefined method `order&#x27; for #&lt;Product:0xb6196084&gt;</pre>


<p><code>Rails.root: /home/dima/RubyOnRails/Projects/depot</code></p>

its my product.rb:

class Product < ActiveRecord::Base
has_many :line_items, dependent: :destroy
has_many :orders, through: :line_items

before_destroy :ensure_not_referenced_by_any_line_item

attr_accessible :title, :description, :image_url, :price

validates :title, :description, :image_url, :price, :presence => true
validates :price, numericality: {greater_than_or_equal_to: 0.01}
validates :title, uniqueness: true
# validates :image_url, allow_blank: true, format: {
# with: %r{ \.(gif|jpg|png)$}i,
# message: 'gif, jpg png. '
#}
#validates :image_url, :uniqueness => false

def ensure_not_referenced_by_any_line_item
if line_items.empty?
return true
else
errors.add(:base, " have products line")
return false
end
end

end

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