I get 5 failures, all the same: undefined method 'update_todo_list' for #<RSpec::...EditingTodoLists:...>

todo_list = options[:todo_list]

within "#todo_list_#{todo_list.id}" do
  click_link "Edit"
end

fill_in "Title", with: options[:title]
fill_in "Description", with: options[:description]
click_button "Update Todo list"

todo_list.reload

expect(page).to have_content("Todo list was successfully updated")
expect(todo_list.title).to eq("New title")
expect(todo_list.description).to eq("New description")

  1) Editing todo lists displays an error with too short a description
     Failure/Error: update_todo_list todo_list: todo_list, description: "hi"

     NameError:
       undefined local variable or method `todo_list' for #<RSpec::ExampleGroups::EditingTodoLists:0x007fbb54baaad8>
       Did you mean?  todo_list_url
     # ./spec/features/todo_lists/edit_spec.rb:52:in `block (2 levels) in <top (required)>'

  2) Editing todo lists displays an error with too short a title
     Failure/Error: update_todo_list todo_list: todo_list, title: "Hi"

     NameError:
       undefined local variable or method `todo_list' for #<RSpec::ExampleGroups::EditingTodoLists:0x007fbb54ba2e00>
       Did you mean?  todo_list_url
     # ./spec/features/todo_lists/edit_spec.rb:42:in `block (2 levels) in <top (required)>'

  3) Editing todo lists displays an error with no title
     Failure/Error: update_todo_list todo_list: todo_list, title: ""

     NameError:
       undefined local variable or method `todo_list' for #<RSpec::ExampleGroups::EditingTodoLists:0x007fbb54b9a868>
       Did you mean?  todo_list_url
     # ./spec/features/todo_lists/edit_spec.rb:34:in `block (2 levels) in <top (required)>'

  4) Editing todo lists updates a todo list successfully with correct information
     Failure/Error:
         within "#todo_list_#{todo_list.id}" do
           click_link "Edit"
       end

     Capybara::ElementNotFound:
       Unable to find css "#todo_list_109"
     # /Users/Frank/.rvm/gems/ruby-2.3.0/gems/capybara-2.3.0/lib/capybara/node/finders.rb:41:in `block in find'
     # /Users/Frank/.rvm/gems/ruby-2.3.0/gems/capybara-2.3.0/lib/capybara/node/base.rb:84:in `synchronize'
     # /Users/Frank/.rvm/gems/ruby-2.3.0/gems/capybara-2.3.0/lib/capybara/node/finders.rb:30:in `find'
     # /Users/Frank/.rvm/gems/ruby-2.3.0/gems/capybara-2.3.0/lib/capybara/session.rb:585:in `block (2 levels) in <class:Session>'
     # /Users/Frank/.rvm/gems/ruby-2.3.0/gems/capybara-2.3.0/lib/capybara/session.rb:278:in `within'
     # /Users/Frank/.rvm/gems/ruby-2.3.0/gems/capybara-2.3.0/lib/capybara/dsl.rb:51:in `block (2 levels) in <module:DSL>'
     # ./spec/features/todo_lists/edit_spec.rb:11:in `update_todo_list'
     # ./spec/features/todo_lists/edit_spec.rb:22:in `block (2 levels) in <top (required)>'

  5) Editing todo lists displays an error with no description
     Failure/Error: update_todo_list todo_list: todo_list, description: ""

     NameError:
       undefined local variable or method `todo_list' for #<RSpec::ExampleGroups::EditingTodoLists:0x007fbb54a52cf8>
       Did you mean?  todo_list_url
     # ./spec/features/todo_lists/edit_spec.rb:47:in `block (2 levels) in <top (required)>'

CODE:
require 'spec_helper'

describe "Editing todo lists" do

  def update_todo_list(options={})
    options[:title] ||= "My todo list"
    options[:description] ||= "This is my todo list"

    todo_list = options[:todo_list]

    within "#todo_list_#{todo_list.id}" do
      click_link "Edit"
  end

    fill_in "Title", with: options[:title]
    fill_in "Description", with: options[:description]
    click_button "Update Todo list"
  end

  it "updates a todo list successfully with correct information" do
    todo_list = TodoList.create(title: "Groceries", description: "Grocery list")
    update_todo_list todo_list: todo_list,
                     title: "New title",
                     description: "New description"

    todo_list.reload

    expect(page).to have_content("Todo list was successfully updated")
    expect(todo_list.title).to eq("New title")
    expect(todo_list.description).to eq("New description")
  end

  it "displays an error with no title" do
    update_todo_list todo_list: todo_list, title: ""
    title = todo_list.title
    todo_list.reload
    expect(todo_list.title).to eq(title)
    expect(page).to have_content("error")
  end

  it "displays an error with too short a title" do
    update_todo_list todo_list: todo_list, title: "Hi"
    expect(page).to have_content("error")
  end

  it "displays an error with no description" do
    update_todo_list todo_list: todo_list, description: ""
    expect(page).to have_content("error")
  end

  it "displays an error with too short a description" do
    update_todo_list todo_list: todo_list, description: "hi"
    expect(page).to have_content("error")
  end
end