goals do
  message <<-MARKDOWN
  When a user creates a new topic, or edits an existing topic, they are
  currently shown a page with just that topic. For our voting app it makes
  more sense that they would be taken back to the topic list.

  In this step we'll change the flow of our app so that the user is taken back to the topics list after they add a new topic (create) or
  edit an existing topic (update).
  MARKDOWN
end

steps do

  step "Change the topics controller" do

    message "Open `app/controllers/topics_controller.rb` and look at the create method. "

    message "Find the line:"

    source_code :ruby, "format.html { redirect_to @topic, notice: 'Topic was successfully created.' }"


    message 'and change `@topic` to `topics_path` like this:'

    source_code :ruby, "format.html { redirect_to topics_path, notice: 'Topic was successfully created.' }"

    message 'so that the method looks like this:'

    source_code :ruby, <<-RUBY
def create
  @topic = Topic.new(topic_params)

  respond_to do |format|
    if @topic.save
      format.html { redirect_to topics_path, notice: 'Topic was successfully created.' }
      format.json { render action: 'show', status: :created, location: @topic }
    else
      format.html { render action: 'new' }
      format.json { render json: @topic.errors, status: :unprocessable_entity }
    end
  end
end
    RUBY

message "In the same file, locate the update method. "

    message "Find the line:"

    source_code :ruby, "format.html { redirect_to @topic, notice: 'Topic was successfully updated.' }"


    message 'and change `@topic` to `topics_path` like before:'

    source_code :ruby, "format.html { redirect_to topics_path, notice: 'Topic was successfully updated.' }"
  end

  step "Confirm your changes" do
    message "Create some new topics at <http://localhost:3000>. Notice when you create a new topic, the application takes you back to the index page with all the topics."
  end
end

explanation do
  message <<-MARKDOWN
    Let's look at the following code snippet, piece by piece:

    ```ruby
    format.html { redirect_to topics_path, notice: 'Topic was successfully created.' }
    ```

    * `format.html` means that the server should send html back to the browser
    * `redirect_to topics_path` means show the **topics list page** when we're done creating or updating a topic
    * `notice: 'Topic was successfully created/updated.'` puts the message into the flash so it will be displayed on the topics list. You can see the flash message at the very top of `app/views/topics/index.html.erb`
  MARKDOWN
end

next_step "make_the_topic_title_a_link"