PUT-ing a form to update a row, but I can't find the id. Where is it?

Question

How should I be passing in the ID?

Error:

Couldn't find Product without an ID

Form:

<% form_for :product, @product, :url => { :action => :update } do |f| %>
  <%= f.error_messages %>

  <p>
    <%= f.label :names %><br />
    <%= f.text_field :names %>
  </p>
  <p>
    <%= f.submit 'Update' %>
  </p>
<% end %>

Controller (for /products/edit/1 view):

def edit
  @product = Product.find(params[:id])
end

Controller (to change the db):

def update
    @product = Product.find(params[:id])

    respond_to do |format|
      if @product.update_attributes(params[:product])
        format.html { redirect_to(@product, :notice => 'Product was successfully updated.') }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @product.errors, :status => :unprocessable_entity }
      end
    end
  end

Answer 1

Try removing the :product from the form_for statement

Edit: Try removing the url option also. The issue is that the URL which you are posting to does not have an id attribute.

Answer 2

This form tag should be sufficent:

<% form_for @product do |f| %>

Make sure you have this line in your config/routes.rb:

map.resources :products

For extra credit, you can simplify loading the @product in your controller with a before_filter:

class ProductsController < ApplicationController
  before_filter :load_product, :only => [:show, :edit, :update, :destroy]
  def load_product
    @product = Product.find(params[:id])
  end
end