Which of the following is not an advantage of using an integrated development environment (IDE) for Rails ,compared with using a simple text editor?

Which of the following protects 'NOT NULL' fields against missing a user input?

Which statement is true regarding the find_or_create method in Ruby on Rails?

Which of these files determine Ruby version and gemset for RVM library?

Which of these options is right to create default scope of model in Rails?

What is the difference between jruby and ruby?

What's an equivalent way of performing the following (h is a Hash): h.each { |k,v| h.delete k if k.nil? }

Which is valid objects of class Integer or one of its subclasses? 1) -123 2) 0xFF 3) 123_456_789 4) 123456789123456789123456789123456789

All Ruby number objects are instances of class _____.

If a method is protected:

link_to('link text', url, :remote => true) does which of the following?