dom_id method isn't working for me

Updated index.html.erb line 15 (below <tbody> to

<tr id="<% dom_id(todo_list) %>">

-- reloaded page & inspected element, but the todo_list items aren't numbered. Did the bin/rspec thing and got this error:

 Editing todo lists updates a todo list successfully with correct information
 Failure/Error: within "#todo_list_#{todo_list.id}" do
 Capybara::ElementNotFound:
   Unable to find css "#todo_list_2"

I've seen other questions about this issue, but those answers did not help me. Help?

Also -- in case this sheds any light -- I just did bin/rake spec to see what it'd say, and got this (excerpted):

MacBook-Pro-1:odot itadministrator$ bin/rake spec Running via Spring preloader in process 3658 /Users/itadministrator/.rbenv/versions/2.2.1/bin/ruby -S rspec ./spec/controllers/todo_lists_controller_spec.rb ./spec/features/todo_lists/create_spec.rb ./spec/features/todo_lists/destroy_spec.rb ./spec/features/todo_lists/edit_spec.rb ./spec/helpers/todo_lists_helper_spec.rb ./spec/models/todo_list_spec.rb ./spec/requests/todo_lists_spec.rb ./spec/routing/todo_lists_routing_spec.rb ./spec/views/todo_lists/edit.html.erb_spec.rb ./spec/views/todo_lists/index.html.erb_spec.rb ./spec/views/todo_lists/new.html.erb_spec.rb ./spec/views/todo_lists/show.html.erb_spec.rb .FFFFF*..DEPRECATION WARNING: named_routes.helpers is deprecated, please use route_defined?(route_name) to see if a named route was defined. (called from block (4 levels) in <top (required)> at /Users/itadministrator/rails_training/odot/spec/controllers/todo_lists_controller_spec.rb:75) ........DEPRECATION WARNING: named_routes.helpers is deprecated, please use route_defined?(route_name) to see if a named route was defined. (called from block (3 levels) in <top (required)> at /Users/itadministrator/rails_training/odot/spec/controllers/todo_lists_controller_spec.rb:156) ..............*........F

Pending: TodoListsHelper add some examples to (or delete) /Users/itadministrator/rails_training/odot/spec/helpers/todo_lists_helper_spec.rb # No reason given # ./spec/helpers/todo_lists_helper_spec.rb:14 TodoList add some examples to (or delete) /Users/itadministrator/rails_training/odot/spec/models/todo_list_spec.rb # No reason given # ./spec/models/todo_list_spec.rb:4