[Rails] Rails ERD - Help with model

Hello i have some errors in generating ERD from models.. I guess i have
wrong associations.. please look at it

[DB]

orders
------
payment_address_id
delivery_address_id
user_id
products_orders
---------------
product_id
order_id

[MODELS]

Order
-----
has_many :products_orders
has_many :products, :through => :products_orders
belongs_to :address, :foreign_key => :payment_address_id
belongs_to :address, :foreign_key => :delivery_address_id
belongs_to :user

products_orders
---------------
belongs_to :product
belongs_to :order

[rake erd]
Warning: Ignoring invalid association :products_orders on Order
(uninitialized constant Order::ProductsOrder)
Warning: Ignoring invalid association :products on Order (uninitialized
constant Order::ProductsOrder)
Warning: Ignoring invalid association :user on Order (uninitialized
constant Order::User)
Warning: Ignoring invalid association :products_orders on Product
(uninitialized constant Product::ProductsOrder)
Warning: Ignoring invalid association :orders on Product (uninitialized
constant Product::ProductsOrder)
what have i wrong ? Thank you

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