_url_form.html.erb

<%= form_for([@digital_object_identifier, @url]) do |f| %>
	<div class="field">
    <%= f.text_field :url %>
  </div>
  <%= f.submit "Set New Url", class: "btn btn-success" %>
<% end %>

digital_object_identifiers.html.erb

class DigitalObjectIdentifiersController < ApplicationController
  before_action :set_digital_object_identifier, only: [:show, :edit, :update, :destroy]



  def index
    @digital_object_identifiers = DigitalObjectIdentifier.all
  end


  def show
    @url = Url.new
  end


  private
    # Use callbacks to share common setup or constraints between actions.
    def set_digital_object_identifier
      @digital_object_identifier = current_user.digital_object_identifiers.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def digital_object_identifier_params
      params.require(:digital_object_identifier).permit(:string_identifier, :integer_identifier, :description, urls_attributes: [ :url ] )
    end

    def edit_digital_object_identifier_params
      params.require(:digital_object_identifier).permit(:string_identifier, :integer_identifier, :description )
    end
end

FROM lOG

Started POST "/urls" for 127.0.0.1 at 2013-10-28 00:18:27 -0700
Processing by UrlsController#create as HTML
  Parameters: {"utf8"=>"√", "authenticity_token"=>"Actwx4PzZoH2Zb3F2x1ZFKzTV/b2F
pFfTltkFBUHj2o=", "url"=>{"url"=>"wew.wew.wew"}, "commit"=>"Set New Url"}
  ←[1m←[36mUser Load (0.0ms)←[0m  ←[1mSELECT "users".* FROM "users" WHERE "users
"."id" = 2 ORDER BY "users"."id" ASC LIMIT 1←[0m
Completed 404 Not Found in 40ms

ActiveRecord::RecordNotFound (Couldn't find DigitalObjectIdentifier without an I
D):
  app/controllers/urls_controller.rb:15:in `set_digital_object_identifier'

parameters

Parameters:

{"utf8"=>"✓",
 "authenticity_token"=>"Actwx4PzZoH2Zb3F2x1ZFKzTV/b2FpFfTltkFBUHj2o=",
 "url"=>{"url"=>"www.somethingnew.com"},
 "commit"=>"Set New Url"}

routes.rb

DigitalObjecIdentifier::Application.routes.draw do
  
    resources :digital_object_identifiers do
      resources :urls, only: [:create]
    end

  devise_for :users

  root :to => "digital_object_identifiers#index"
  resources :users
 
end

show.html

<p>
  <strong>URL:</strong>
  	<p>
  	www.asdkl.com
  	</p>
  	<p>
  	www.somethingnew.com
  	</p>
  	<p>
  	www.somethingelse.com
  	</p>
  	<p>
  	www.asdkj.com
  	</p>
  	<p>
  	
  	</p>
</p>
<section>
    <form accept-charset="UTF-8" action="/urls" class="new_url" id="new_url" method="post"><div style="margin:0;padding:0;display:inline"><input name="utf8" type="hidden" value="&#x2713;" /><input name="authenticity_token" type="hidden" value="Actwx4PzZoH2Zb3F2x1ZFKzTV/b2FpFfTltkFBUHj2o=" /></div>
	<div class="field">
    <input id="url_url" name="url[url]" type="text" />
  </div>
  <input class="btn btn-success" name="commit" type="submit" value="Set New Url" />
</form>
</section>

<a href="/digital_object_identifiers/7/edit">Edit</a> |
<a href="/digital_object_identifiers">Back</a>

show.html.erb

<p id="notice"><%= notice %></p>

<p>
  <strong>String identifier:</strong>
  <%= @digital_object_identifier.string_identifier %>
</p>

<p>
  <strong>Integer identifier:</strong>
  <%= @digital_object_identifier.integer_identifier %>
</p>

<p>
  <strong>Description:</strong>
  <%= @digital_object_identifier.description %>
</p>

<p>
  <strong>URL:</strong>
  <% @digital_object_identifier.urls.each do |url| %>
  	<p>
  	<%= url.url %>
  	</p>
  <% end %>
</p>
<section>
    <%= render 'shared/url_form' %>
</section>

<%= link_to 'Edit', edit_digital_object_identifier_path(@digital_object_identifier) %> |
<%= link_to 'Back', digital_object_identifiers_path %>

url_controller

class UrlsController < ApplicationController

	before_action :set_digital_object_identifier

	def create
		@url = @digital_object_identifier.urls.build(params[:url])
		if @url.save
			flash[:success] = "Url Added"
			redirect_to root_url
		end
	end

private
  # Use callbacks to share common setup or constraints between actions.
  def set_digital_object_identifier
    @digital_object_identifier = current_user.digital_object_identifiers.find(params[:digital_object_identifier_id])
    redirect_to root_url if @digital_object_identifier.nil?
  end