close
class Product < ActiveRecord::Base
has_many :orders, :through => :line_items
# ....
會發生
ActiveRecord::HasManyThroughAssociationNotFoundError ...
的錯誤訊息，
在 :through語法前加上 han_many :line_items 即可
完整程式碼：
class Product < ActiveRecode::Base
has_many :line_items
has_many :orders, :through => :line_items
# ....
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