Rails Updating Data in one Model from another Model's Controller

I have a User model that has billing_id. I have Order model that runs transactions with a payment gateway which returns a billing id I'd like to save into the billing_id column on the User model. I think I am getting the basics of MVC architecture mixed up.

I am u开发者_StackOverflow社区nder the impression that UsersController and OrdersController update data of their respective tables. Does that mean that if I have something returned from OrdersController such as a billing id, there is no other way of saving that billing id into a billing_id column in User model? Thanks and sorry if this is extremely rudimentary. :)

Also, I thought a possible solution might be to somehow pass in the return value via ApplicationsController into UsersController to save into User table. Is this possible?

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Your user orders table should have an instance of user_id, as a user can have multiple orders.

You can do this by creating a migration:

rails g migration add_user_id_to_orders order_id:integer
rake db:migrate

Your models will then look like:

class User < ActiveRecord::Base
  has_many :orders
end

class Order < ActiveRecord::Base
  belongs_to :user
end

You need a link between the two (order_id) otherwise they would have no knowledge of each other. This is known as a foreign key.

When things are set up this way, you can get the users by doing:

User.find(1).orders

And you can find the user information from an order by doing:

Orders.find(1).user

I hope this helps.

EDIT:

Orders.find(ORDER_ID).user.update_attributes(:billing_id => BILLING_ID)