Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "To use Rails 4.0.0 with Heroku, we need to add the rails_12factor gem to the Gemfile so that we can precompile our assets."

A block of code is set as follows:

    def obscure_string(string, count)
        return string if count.blank?
        substring = string.slice(0..(-1 * count - 1))
        return string.gsub(substring, "*" * substring.length)
    end

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

resources :products do
 collection do
 get 'import'
 end
  resources :variants
end

Commands that need to be entered at the terminal / shell window are set as follows:

gem install rails -v 4.0.0 --no-ri --no-rdoc

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "You should see a Welcome aboard page that lists out some helpful tips as well as information about the application's configuration as shown in the following screenshot:".