Correct association between Order, Product and User in Rails?

Question

Ruby on Rails

Friends, I have a question. I have users, everyone can make many orders , each of which will contain one product. At the moment I have done this:

class Order
  belongs_to :user
  belongs_to :product
end

class Product
  belongs_to :category
  has_many :orders
end

class User
  has_many :orders
end

However, the thought does not let me go that you can go this way:

class User
   has_many :orders
   has_many :products, through: :orders
end

class Order
  belongs_to :user
  belongs_to :product
end

class Product
  belongs_to :category
  has_many :orders
  has_many :users, through: :orders
end

Is it worth it? What is the advantage of the second approach? Which approach is more correct?

Answer 1

So the same thing is written, only with an additive.
And the advantage is that AR in one request will be able to get all users who have bought, for example, a certain product.
Well, just change the naming a little, so that, kmk, it is clearer:

class User
  has_many :orders
  has_many :purchased_products, through: :orders, source: :product