undefined method `content'

at the last stage of the course when I ran a test and I got this error in rspec

Viewing the todo items Displays the title of todo list displays no items when todo list is empty displays item content when a todo list has items (FAILED - 1)

Failures:

1) Viewing the todo items displays item content when a todo list has items Failure/Error: click_link "List Items" ActionView::Template::Error: undefined method content' for nil:NilClass # ./app/views/todo_items/index.html.erb:6:inblock in app_views_todo_items_index_html_erb3713388154754784548_70050973841440' # ./app/views/todo_items/index.html.erb:5:in `_app_views_todo_items_index_html_erb_3713388154754784548_70050973841440' # ./spec/features/todo_items/index_spec.rb:10:in block in visit_todo_list' # ./spec/features/todo_items/index_spec.rb:9:invisit_todo_list' # ./spec/features/todo_items/index_spec.rb:31:in `block (2 levels) in <top (required)>'

Finished in 0.18019 seconds 3 examples, 1 failure

Failed examples:

rspec ./spec/features/todo_items/index_spec.rb:27 # Viewing the todo items displays item content when a todo list has items

Randomized with seed 30861

Here's my code:

in index.html.rb:

<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 do |todo_item| %> <li><%= @todo_item.content %></li> <% end %> </ul>

in index_spec.rb:

require 'spec_helper'

describe "Viewing the todo items" do

let!(:todo_list){todo_list = TodoList.create(title: "al bayt", description: "al bayt goodies")}
def visit_todo_list(list)
    visit "/todo_lists"
    within "#todo_list_#{list.id}" do
        click_link "List Items"
    end
end


it "Displays the title of todo list" do
    visit_todo_list(todo_list)
    within "h1" do
        expect(page).to have_content(todo_list.title)
    end
end

it "displays no items when todo list is empty" do
    visit_todo_list(todo_list)
    expect(page.all("ul.todo_list li").size).to eq(0)
end

it "displays item content when a todo list has items" do
    todo_list.todo_items.create(content: "Drinks")
    todo_list.todo_items.create(content: "Food")

    visit_todo_list(todo_list)

    expect(page.all("ul.todo_items li").size).to eq(2)
    within "ul.todo_items" do
        expect(page).to have_content("Drinks")
        expect(page).to have_content("Food")
    end
end

end