ruby on rails - undefined method `todo_items' for #<TodoList:0x4528c20> -

i getting error

undefined method `todo_items' #<todolist:0x4528c20> 

in code:

<h1><%= @todo_list.title %></h1> <p>find me in app/views/todo_items/index.html.erb</p>  <ul class="todo_items">   <% @todo_list.todo_items.each |todo_item| %>   <li><%= todo_item.content %></li>   <% end %> </ul> 

i new rails, unsure how debug error or where possible issue. can guide me on equivalent of console.log or var_dump in rails.

update:

todo_items_controller.rb

class todoitemscontroller < applicationcontroller   def index     @todo_list = todolist.find(params[:todo_list_id])   end end 

it looks missing has_many association in todolist class.

has_many :todo_items 

assuming have todoitem class associated db table