如何在Rails控制器中的show action中获取值

Question

I would like to have access to the parameters in nested attributes..... Below is the code.

<%= link_to "Invoice", user_invoice_path(@user, invoice) %>

How do I access the user and invoice in the Invoice controller show action.

def show
  @user = User.find(params[:user_id])
  @invoice = Invoice.find(params[:id])
end 

User Model:

class User < ActiveRecord::Base
  has_many :invoices
end

Invoice Model:

class Invoice < ActiveRecord::Base
  belongs_to :user
end

I know how it works when it is not nested.... Can anyone, please help?

Answer 1

If I understand correctly, you can't find the @user or @invoice in this way.

Please debug your show action and you will find params as follows,

{"action"=>"show", "controller"=>"invoices", "user_id"=>"307", "id"=>"359"}

So now write your show action something like,

def show
  @invoice = Invoice.find(params[:id])
  @user = User.find(params[:user_id])
end

There may be better ways to find the objects in the controller action. But this is the basic approach you will have to consider instead of what you tried.