w4d2

Question 1

What is the view responsible for?

Answer 1

Rendering the HTML to return to the client browser.

Question 2

What are the two methods to create an HTTP response?

Answer 2

render (create a full response) and #redirect_to (tell the client to make a new HTTP request for a different resource)

Question 3

What happens to instance variables set in the controller?

Answer 3

They are made available in the template that they call.

Question 4

What is wrong with the following code and how can it be ameliorated?

def show
  @book = Book.find(params[:id])
  if @book.special?
    render :special_show
  end

render :regular_show
end

Answer 4

render will be evaluated more than once and will throw an error. It can be fixed by ensuring that render is only encountered once in the program flow:

def show
  @book = Book.find(params[:id])
  if @book.special?
    render :special_show
  else
    render :regular_show
  end
end

Question 5

What is the helper to return a user to their previous page?

Answer 5

redirect_to :back

Question 6

T/F: #render and #redirect_to act like the ‘return’ keyword in that they terminate execution of the function.

Answer 6

F; evaluation will continue