This presentation is about explaining what is decoupling

1. Decouple, Bundle and Share with
Ruby Gems
Nhm Tanveer Hossain Khan (Hasan)

2. Things on the table
• What is decoupling ?
• What is Gem ?
• Create RubyConf2013_Hello Gem.
• Publish on RubyGems Repository.
• And share with fellow ruby developers

3. About me!
• Working with Ruby for last 6 years.
• Currently working with “Genweb2 Ltd.” as
“Systems Architect”
• Passionate about Ruby, Java, Nodejs, Creative
idea and FOOD!
• Built http://www.khadok.com
• My Github profile -
https://github.com/we4tech

4. Decoupling!

5. What is decoupling Coupling?

6. What is decoupling ?

7. Direct benefits!

8. Benefits (contd.)
• Creates reusable code
• Modularizes structure
• Responds to polymorphic behavior
• Possible to integrate with other projects

9. Trade-offs
• Requires common sense
• Requires expertise on understanding “What’s
enough?”
• It should be derived from a real project.
• Requires tune up and adjustment based on
real requirements.

10. Ruby Gems!

11. What is Ruby Gems ?

12. Or This!

13. Real Ruby Stone!
Collected from wikipedia - http://en.wikipedia.org/wiki/File:Ruby_-_Winza,_Tanzania.jpg

14. Ruby Gem/Gemstone!
Collected from wikipedia - http://en.wikipedia.org/wiki/File:Cardinal_gems.png

15. Finally a complete Necklace!

16. Ruby Gems Repository
Publish Gem
"mysql"
Ruby Dev
Over the Internet Publish Gem
RubyGems Repository "user_auth"
Ruby Dev
Publish Gem
"factory_girl"
Ruby Dev

17. A complete ruby application

18. Create RubyConf2013_hello
gem!

19. $ gem install bundle
$ bundle gem rubyconfbd2013_hello

20. Generated files

21. Code it!
# File: lib/rubyconfbd2013_hello.rb
require "rubyconfbd2013_hello/version"
module Rubyconfbd2013Hello
def rubyconfbd_year
2013
end
def rubyconfbd_location
'Bangladesh'
end
end
Object.send(:extend, Rubyconfbd2013Hello)
Object.send(:include, Rubyconfbd2013Hello)

22. Add Gem information
# File: rubyconfbd2013_hello.gemspec
# Other codes ……
gem.authors =
["nhm tanveer hossain khan"]
gem.email =
["hasan83bd@gmail.com"]
gem.description =
%q{A very basic gem demonstration
for RubyConfBD 2013}
gem.summary =
%q{A very basic gem demonstration for
RubyConfBD 2013}
gem.homepage =
"https://github.com/we4tech/rubyconfbd2013_hello"

23. $ rake release

24. Result!

26. Usages!
• $ gem install
rubyconfbd2013_hello
• $ irb
• require “rubyconfbd2013_hello”
• Object.rubyconfbd_year
• => 2013
• Object.rubyconfbd_location
• => „Bangladesh”

27. You can check it yourself!
• Rubygems link -
https://rubygems.org/gems/rubyconfbd2013_
hello
• Github link -
https://github.com/we4tech/rubyconfbd2013
_hello

28. That’s It! ( Question.any? )
