Question

Please tell me what am I doing wrong here. I want to be able to capitalize any string that is being added later in the code through the method titles .

class Book
  attr_accessor :book_title

  def initialize
       @book_title = String.new
     end

  def titles
    book_title.capitalize
  end

end

@book = Book.new
puts @book.titles = "steve jobs"

Because when I execute it, I get undefined method `titles=' for #<Book:0x007fbd25813d98 @book_title=""> (NoMethodError)

Answer 1

It’s a little unclear as to what you’re trying to accomplish. You’re adding an attr_accessor for book_title, not for titles (which isn’t a variable at all). You need to call

puts @book.book_titles = "Steve Jobs"

in order to set (and print) the title.

If you’re trying to pass a title to titles and have that method capitalize the title and set @book_title to that, you need to declare it as an assignment method using =, pass in the parameter title, and actually set @book_title to that. Something like this

def titles= title
  @book_title = title.capitalize
end

Currently your titles method only returns the capitalized local variable book_title, which doesn’t exist (it needs the @ to reference the instance variable).