Question

Suppose that I’ve two controllers, “good” and “customer” and that I want add many goods to a single customer; in which way can I do this?

I mean, I need a customer’s show view that list all goods associated to that project and a “add good to customer” used to add a new object to customer.

Answer 1

You would want to do that at the model level with an association and then allow for nested attributes.

It might look like this

model

class customer < ActiveRecord::Base
    has_one :goods
    accepts_nested_attributes_for :goods
end

Then in the views for customer you would want to have the nested form. This Railscast gives a good overview for that. Because of the association and the accepts you can automatically inherit them in the controller. Also there is a similar question here that amplifies the explanation.