NoMethodError: has_completed_items?; has_incomplete_items?

require 'spec_helper'

describe TodoList do
  it { should have_many(:todo_items) }

  describe "#has_complete_items?" do
    let(:todo_list) { TodoList.create(title: "Groceries", description: "Grocery list") }

    it "returns true with completed todo list items" do
      todo_list.todo_items.create(content: "Eggs", completed_at: 1.minute.ago)
      expect(todo_list.has_completed_items?).to be_true
    end

    it "returns false with no completed todo list items" do
      todo_list.todo_items.create(content: "Eggs")
      expect(todo_list.has_completed_items?).to be_false
    end
  end

  describe "#has_incomplete_items?" do
    let(:todo_list) { TodoList.create(title: "Groceries", description: "Grocery list") }

    it "returns true with incompleted todo list items" do
      todo_list.todo_items.create(content: "Eggs")
      expect(todo_list.has_incomplete_items?).to be_true
    end

    it "returns false with no incomplete todo list items" do
      todo_list.todo_items.create(content: "Eggs", completed_at: 1.minute.ago)
      expect(todo_list.has_incomplete_items?).to be_false
    end
  end

end

class TodoList < ActiveRecord::Base
  has_many :todo_items

  validates :title, presence: true
  validates :title, length: { minimum: 3 }
  validates :description, presence: true
  validates :description, length: { minimum: 5 }

  def has_completed_items?
    todo_items.complete.size > 0
  end

  def has_incomplete_items?
    todo_items.incomplete.size > 0
  end 
end