From: tamouse mailing lists <tamouse.lists@...>
Date: 2013-05-09T13:17:31+09:00
Subject: Re: Looping back to CRUD interface

> On May 8, 2013 5:41 PM, "Michael Bowen" <lists@ruby-forum.com> wrote:
>>
>> How can I return the program back to the CRUD menu if the user wants to
>> take another action? I thought about using returns, but I'm not quite
>> sure how that would work.
>>
>> #movie hash
>> movies = { superbad: 4,
>> miami_vice: 0,
>> juno: 0
>> }
>> #Get CRUD input
>> puts "Do you want to add, update, display, delete or exit?"
>> choice = gets.chomp.downcase
>>
>> #case since there are many conditions/options
>> case choice
>> when 'add'
>>     puts "Give me a movie title"
>>     title = gets.chomp
>>     if movies[title.to_sym].nil?
>>         puts "Now rate it"
>>         rating = gets.chomp
>>         movies[title.to_sym] = rating.to_i
>>     else
>>         puts "That movie already exists"
>>     end
>> when "update"
>>     puts "Give me the title."
>>     title = gets.chomp
>>     if movies[title.to_sym].nil?
>>         puts "That movie does not exist"
>>     else
>>         puts "What is the new rating?"
>>         rating = gets.chomp
>>         movies[title.to_sym] = rating.to_i
>>         puts "#{rating} is the new rating!"
>>     end
>> when "display"
>>     movies.each { |x , y| puts "#{x}: #{y}"}
>> when "delete"
>>     puts "What is the title you want to remove?!"
>>     title = gets.chomp
>>     if movies[title.to_sym].nil?
>>         puts "Error, movie is not listed."
>>     else
>>         movies.delete(title.to_sym)
>>         puts "#{title} has been removed"
>>     end
>> when 'exit'
>>   return 0
>> else
>>     puts "Error!"
>> end
>>
>>
>> #how to make it loop back to beginning?

On Wed, May 8, 2013 at 11:09 PM, Cliff Rosson <cliff.rosson@gmail.com> wrote:
> until exit do
> ... do stuff...
> end
>

err..um..err.. `exit` is a method on Kernel that causes the script to
exit immediately. Probably you had something else in mind?

loop do

   # code-n-stuff
   when 'exit'
      break # causes loop to stop
   else
      puts 'Error!'
   end

end

To OP: investigate the highline gem for dealing with nice I/O in
command line scripts.