Question

2.Given the following layout declarations, which of the following is/are true? Select all that applies:

application_controller.rb:
class ApplicationController < ActionController::Base
  layout "main"
end

articles_controller.rb:
class ArticlesController < ApplicationController
end

special_articles_controller.rb:
class SpecialArticlesController < ArticlesController
  layout "special"
end

old_articles_controller.rb:
class OldArticlesController < SpecialArticlesController
  layout false
  def show
    @article = Article.find(params[:id])
  end
  def index
    @old_articles = Article.older
    render layout: "old"
  end
  # ...
end

In general, views will be rendered in the main layout

SpecialArticlesController#index will use the special layout

OldArticlesController#show will use no layout at all

OldArticlesController#index will use the old layout

None of the choices.

ArticlesController#index will use the main layout

3.If a template or partial is not found in the conventional path, the controller will look for a template or partial to render in its inheritance chain. Given the following code, what is the lookup order for an admin/products#index action? Enter numeric 1, 2, or 3, where 1 means first and 3 means last.

NOTE: If you aren't sure about this from your reading, you should test this on your computer.

# in app/controllers/application_controller
class ApplicationController < ActionController::Base
end

# in app/controllers/admin_controller
class AdminController < ApplicationController
end

# in app/controllers/admin/products_controller
class Admin::ProductsController < AdminController
  def index
  end
end

app/views/admin/

      [ Choose ]            2            1            3      

app/views/application

      [ Choose ]            2            1            3      

app/views/admin/products/

[ Choose ]            2            1            3

4.In Rails, render tells Rails which view (or other asset) to use in constructing a response, whereas the redirect_to method tells the browser to send a new request for a different URL.

True

False

5.Consider the following code showing two different versions of the show method, namely, one with render and the other with redirect_to

def show
  @book = Book.find_by(id: params[:id])
  if @book.nil?
    render action: "index"
  end
end

def show
  @book = Book.find_by(id: params[:id])
  if @book.nil?
    redirect_to action: :index
  end
end

Select all that applies. There may be multiple answer(s).

The "redirect_to" command, when executed, stops the code running while it waits for a new request from the browser to arrive as the response to an HTTP 302 status code.

The "render :action" code doesn't run any code in the target action, so nothing will set up the @books variable that the index view will probably require.

The downside to the "redirect_to" code is that it requires a round trip to the browser if controller finds no book in the /books/1 request.

There is no functional difference between both show methods. The results are the same.

6.Rails has several asset tag helpers, which help provide methods for generating HTML that links views to feeds, Javascript, CSS, images, videos, and other assets.

For example, the ojavascript_include_tag translates the following from

<%= javascript_include_tag "main" %>

to

<script src='/assets/main.js'></script>

Which of the following is a valid asset tag helper in Rails? Select all that applies. There may be more than one correct answers.

stylesheet_link_tag

image_tag

video_tag

stylesheet_tag

video_tag

Answer 1

2.old articles controllers will use the old layout

3.apps/view/application

4.True

5.all true

6.stylesheet_link_tag