CODEWITHSUNDEEP
ruby-on-railsrubycontroller
Tom Caraccia
Tom Caraccia

Reputation: 21

Passing on Rails model to child controller

I have the following url /purchases/3/payments/new, which I get in the purchases controller by

link_to 'pay', purchase_path(purchase)+new_payment_path

Now in the payments controller I would need to have the purchase object, or its id at least from where it was invoked. I tried using a param, but is there any other way ? Thanks

Upvotes: 1

Views: 264

Answers (2)

Richard Peck
Richard Peck

Reputation: 76784

Routes

I immediately highlighted this as a problem:

 purchase_path(purchase)+new_payment_path

This is really bad (configuration over convention) - you'll be much better using the actual path helper to load the resource you need (keeps it DRY & conventional)

--

Nested

As mentioned by Jon M, your solution will come from the use of nested resources:

#config/routes.rb
resources :purchases do
    resources :payments  # -> domain.com/purchases/:purchase_id/payments/new
end

This will allow you to use the route path as described by Jon.

--

Controller

in the payments controller I would need to have the purchase object, or its id

By using nested resources, as described above, the route will hit your payments controller and have the following param available:

params[:purchase_id]

Note the naming of the param (only the nested resource is identified with params[:id]), as demonstrated in the docs: /magazines/:magazine_id/ads/:id

I would recommend using the following code in your controller:

#app/controllers/payments_controller.rb
class PaymentsController < ApplicationController
   def new
       @purchase = Purchase.find params[:purchase_id]
   end
end

Upvotes: 0

Jon M.
Jon M.

Reputation: 3548

Using params makes sense.

You should be able to get the purchase ID like this in the payments controller:

params[:purchase_id]

However, need to setup your routes in a specific way to do this:

resources :purchases do
  resources :payments
end

Then you can create the link in the view like this:

link_to 'pay', new_purchase_payment_path(purchase)

Have a look at these docs too: http://guides.rubyonrails.org/routing.html#nested-resources

Upvotes: 2

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