dynamic select list @www.stonemind.net

Hi,
Has anyone read the web page by “Adding Dynamic Select Lists to
Resource Scaffolding in Rails” at
http://www.stonemind.net/blog/2007/09/26/adding-dynamic-select-lists-to-resource-scaffolding-in-rails/
by Adam Smith. The logic is easy to follow. The codes are easy too.

  I followed the tutorial. I worked thru it twice. I might have
misplaced one or two lines of the codes. I got errors and errors. They
want us to buy the book. Any advice?
regards,

Hard to say without knowing errors you have got (and where etc...)

Fred

Thank you Fred,

  I copied all the errors below. I am a non-programmer. I don't know
what is wrong with line 13 in categories/new.html.erb. The tutorial
states that such line is to be inserted into the file in replacing the
existing parent form field. The originalfile is shown immediately below:

    <h1>Editing category</h1>

    <%= error_messages_for :category %>

    <% form_for(@category) do |f| %>
      <p>
       <b>Name</b><br />
        <%= f.text_field :name %>
      </p>

      <p>
        <b>Parent</b><br />
        <%= f.text_field :parent_id %>
      </p>

      <p>
        <%= f.submit "Update" %>
      </p>
    <% end %>

    <%= link_to 'Show', @category %> |
   <%= link_to 'Back', categories_path %>
regards,

Errors:
Processing CategoriesController#new (for 127.0.0.1 at 2008-04-05
21:54:56) [GET]
  Session ID:
BAh7BzoMY3NyZl9pZCIlMTgzNGViZDcyNmI3ZmIwMTU5MDk2YWMxYTUwZjVk%0AOTAiCmZsYXNoSUM6J0FjdGlvbkNvbnRyb2xsZXI6OkZsYXNoOjpGbGFzaEhh%0Ac2h7AAY6CkB1c2VkewA%3D--6e8e3ef6b8a0cd94d01e2bfe86ffe0c7a7688f01
  Parameters: {"action"=>"new", "controller"=>"categories"}
  Category Columns (0.002429) SHOW FIELDS FROM `categories`
  Category Load (0.000357) SELECT * FROM `categories` ORDER BY
parent_id, name
Rendering template within layouts/categories
Rendering categories/new

ActionView::TemplateError (Couldn't find template file for
categories/_select_category in ["/var/www/test/app/views"]) on line #13
of categories/new.html.erb:
10:
11: <p>
12: <b>Parent</b><br />
13: <%= render(:partial => "select_category") %>
14: </p>
15:
16: <p>

    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/base.rb:312:in
`render_file'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/base.rb:331:in
`render'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/partials.rb:117:in
`render_partial'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:26:in
`benchmark'
    /usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
    /usr/lib/ruby/1.8/benchmark.rb:307:in `realtime'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:26:in
`benchmark'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/partials.rb:116:in
`render_partial'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/base.rb:352:in
`render'
    app/views/categories/new.html.erb:13:in
`_run_erb_47app47views47categories47new46html46erb'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/helpers/form_helper.rb:248:in
`fields_for'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/helpers/form_helper.rb:184:in
`form_for'
    app/views/categories/new.html.erb:5:in
`_run_erb_47app47views47categories47new46html46erb'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/base.rb:637:in
`send'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/base.rb:637:in
`compile_and_render_template'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/base.rb:365:in
`render_template'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_view/base.rb:316:in
`render_file'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:1100:in
`render_for_file'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:858:in
`render_with_no_layout'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:872:in
`render_with_no_layout'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/layout.rb:262:in
`render_without_benchmark'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:51:in
`render'
    /usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:51:in
`render'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/mime_responds.rb:131:in
`send'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/mime_responds.rb:131:in
`custom'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/mime_responds.rb:156:in
`call'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/mime_responds.rb:156:in
`respond'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/mime_responds.rb:150:in
`each'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/mime_responds.rb:150:in
`respond'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/mime_responds.rb:107:in
`respond_to'
    app/controllers/categories_controller.rb:30:in `new'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:1158:in
`send'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:1158:in
`perform_action_without_filters'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/filters.rb:697:in
`call_filters'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/filters.rb:689:in
`perform_action_without_benchmark'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:68:in
`perform_action_without_rescue'
    /usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:68:in
`perform_action_without_rescue'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/rescue.rb:199:in
`perform_action_without_caching'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/caching.rb:678:in
`perform_action'
    /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/abstract/query_cache.rb:33:in
`cache'
    /usr/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/query_cache.rb:8:in
`cache'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/caching.rb:677:in
`perform_action'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:524:in
`send'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:524:in
`process_without_filters'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/filters.rb:685:in
`process_without_session_management_support'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/session_management.rb:123:in
`process'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:388:in
`process'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:171:in
`handle_request'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:115:in
`dispatch'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:126:in
`dispatch_cgi'
    /usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:9:in
`dispatch'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel/rails.rb:76:in
`process'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel/rails.rb:74:in
`synchronize'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel/rails.rb:74:in
`process'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:159:in
`process_client'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:158:in
`each'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:158:in
`process_client'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:285:in
`run'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:285:in
`initialize'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:285:in
`new'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:285:in
`run'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:268:in
`initialize'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:268:in
`new'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel.rb:268:in
`run'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel/configurator.rb:282:in
`run'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel/configurator.rb:281:in
`each'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel/configurator.rb:281:in
`run'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/bin/mongrel_rails:128:in
`run'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/lib/mongrel/command.rb:212:in
`run'
    /usr/lib/ruby/gems/1.8/gems/mongrel-1.1.4/bin/mongrel_rails:281
    /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:489:in
`load'
    /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:489:in
`load'
    /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in
`new_constants_in'
    /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:489:in
`load'
    /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/commands/servers/mongrel.rb:64
    /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
    /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
    /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in
`require'
    /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in
`new_constants_in'
    /usr/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in
`require'
    /usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/commands/server.rb:39
    /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
    /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
    script/server:3

Rendering
/usr/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/templates/rescues/layout.erb
(internal_server_error)

Rails is telling you what the problem is. You've told it 'render me
the contents of the file _select_category.html.erb' and it's telling
you ' I couldn't find that file)

Fred

Thank you very very much.

_select_category.html.erb was not there because there was a
_select_categories.rhtml.

Ror has been changing all the time.

regards,

.rhtml still works, the problem was of course category vs categories.

Fred