Rails 4: No route matches - issue with relationships missing id key - ruby-on-rails

Question

I am hoping someone can help me. I am getting the following issue:
No route matches {:action=>"show", :controller=>"stocks", :stockpile_id=>#<Stock id: 17, stockpile_id: 3, code: "rttrtrt", name: "", description: "", quantity: nil, cost_pence: nil, information: "", created_at: "2013-08-18 19:52:46", updated_at: "2013-08-18 19:52:46">, :id=>nil, :format=>nil} missing required keys: [:id]
When visiting the following URL: /admin/stockpiles/3/stocks/
My routes look like:
scope '/admin' do
root :to => 'admin#index', :as => 'admin'
resources :stockpiles,:companies
scope :path => 'stockpiles/:stockpile_id' do
resources :stocks
end
end
The data contained in the error message:
id | stockpile_id | code | name | description | quantity | cost_pence | information | created_at | updated_at
17 | 3 | rttrtrt | | | | | | 2013-08-18 19:52:46.856864 | 2013-08-18 19:52:46.856864
My Stock Model:
class Stock < ActiveRecord::Base
belongs_to :stockpile
end
Nothing interesting in the Stockpile model, just that it has many stocks..
Here is my controller:
class StocksController < ApplicationController
before_action :set_stock, only: [:show, :edit, :update, :destroy]
def index
#stockpile = Stockpile.find(params[:stockpile_id])
#stocks = #stockpile.stocks.all
end
def show
end
def new
#stockpile = Stockpile.find(params[:stockpile_id])
#stock = #stockpile.stocks.new
end
def edit
end
def create
#stockpile = Stockpile.find(params[:stockpile_id])
#stock = #stockpile.stocks.new(stock_params)
if #stock.save
redirect_to #stock, notice: 'Stock was successfully created.'
else
render action: 'new'
end
end
def update
if #stock.update(stock_params)
redirect_to #stock, notice: 'Stock was successfully updated.'
else
render action: 'edit'
end
end
def destroy
#stock.destroy
redirect_to stocks_url, notice: 'Stock was successfully destroyed.'
end
private
# Use callbacks to share common setup or constraints between actions.
def set_stock
#stockpile = Stockpile.find(params[:stockpile_id])
#stock = #stockpile.stocks.find(params[:id])
end
# Only allow a trusted parameter "white list" through.
def stock_params
params.require(:stock).permit(:code, :name, :description, :quantity, :cost_pence, :information)
end
end
And here is the view in question:
<div class="page-header">
<%= link_to new_stock_path(params[:stockpile_id]), :class => 'btn btn-primary' do %>
<i class="icon-plus icon-white"></i>
New Stock
<% end %>
<h1>Listing stocks</h1>
</div>
<table class="table table-bordered table-striped">
<thead>
<tr>
<th>Stockpile</th>
<th>Code</th>
<th>Name</th>
<th>Description</th>
<th>Quantity</th>
<th>Cost pence</th>
<th>Information</th>
<th></th>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<% #stocks.each do |stock| %>
<tr>
<td><%= stock.stockpile %></td>
<td><%= stock.code %></td>
<td><%= stock.name %></td>
<td><%= stock.description %></td>
<td><%= stock.quantity %></td>
<td><%= stock.cost_pence %></td>
<td><%= stock.information %></td>
<td><%= link_to 'Show', stock %></td>
<td><%= link_to 'Edit', edit_stock_path(stock) %></td>
<td><%= link_to 'Destroy', stock, confirm: 'Are you sure?', method: :delete %></td>
</tr>
<% end %>
</tbody>
</table>
Help would be much appreciated - looks like something weird is going on because stockpile_id seems to be set to stock, and there seems to be no stock params or anything - so we get the missing id error.
Thanks.

Answer 1

It would appear that you need to pass in the stockpile as well as the stock..
<td><%= link_to 'Show', [#stockpile, stock] %></td>
Should do that.
As opposed to using the scope you can probably just use a nested resource in your routes
resources :stockpiles do
resources :stocks
end
and then you can DRY up your stock controller
class StocksController < ApplicationController
before_action :set_stockpile
.....
def set_stockpile
#stockpile = Stockpile.find params[:stockpile_id]
end