Active Support Secrets

Presented as a lightning talk at Nickel City Ruby Conference 2013 on September 21, 2013.

Video is available at http://www.confreaks.com/videos/2852-nickelcityruby2013-lightning-talk-active-support-secrets

Transcript

1. Active Support Secrets
2. Prem Sichanugrist @sikachu /sikachu
5. Secrets
9. String
10. String#inquiry
11. today  =  'saturday' today  =  today.inquiry today.saturday?  #=>  true today.sunday?  #=>  false
12. String#squish
13. very_complex_sql  =  <<-­‐SQL    SELECT  *    FROM  posts    WHERE  state='published' SQL #  =>  "    SELECT  *\n    FROM  posts\n     WHERE  state='published'\n"
14. very_complex_sql  =  <<-­‐SQL.squish    SELECT  *    FROM  posts    WHERE  state='published' SQL #  =>  "SELECT  *  FROM  posts  WHERE   state='published'"
15. String#strip_heredoc
16. content  =  <<-­‐README    Hello        World! README #=>  "    Hello\n        World!\n"
17. class  FancyHello    def  initialize(user)        if  should_say_hello_to?  user            content  =  <<-­‐README                Hello                    World!            README        end    end end #=>  "                Hello\n                    World!\
18. class  FancyHello    def  initialize(user)        if  should_say_hello_to?  user            content  =  <<-­‐README Hello    World! README        end    end end #=>  "Hello\n    World!\n"
19. content  =  <<-­‐README.strip_heredoc    Hello        World! README #=>  "Hello\n    World!\n"
20. String#to_date String#to_datetime String#to_time
21. Date.parse('2013-­‐09-­‐21') #=>  Sat,  21  Sep  2013 '2013-­‐09-­‐21'.to_date #=>  Sat,  21  Sep  2013   DateTime.parse('2013-­‐09-­‐21  09:00:00') #=>  Sat,  21  Sep  2013  09:00:00  +0000 '2013-­‐09-­‐21  09:00:00'.to_datetime #=>  Sat,  21  Sep  2013  09:00:00  +0000   Time.parse('09:00:00') #=>  2013-­‐09-­‐21  09:00:00  -­‐0400 '09:00:00'.to_time #=>  2013-­‐09-­‐21  09:00:00  -­‐0400
22. Hash
23. Hash#transform_keys
24. hash  =  {  foo:  'foo',  bar:  'bar'  } #=>  {:foo=>"foo",  :bar=>"bar"} hash.transform_keys  {  |key|    key.to_s.capitalize  } #=>  {"Foo"=>"foo",  "Bar"=>"bar"}
25. Object
26. Object#in?
27. STARTING_POKEMONS  =  %w(Chespin  Fennekin  Froakie)   if  STARTING_POKEMONS.include?(current_pokemon)    #  ... end
28. STARTING_POKEMONS  =  %w(Chespin  Fennekin  Froakie)   if  current_pokemon.in?(STARTING_POKEMONS)    #  ... end
29. Object#presence
30. "Hello".presence #=>  "Hello" nil.presence #=>  nil
31. state  =  if  params[:state].present?    params[:state] end   country  =  if  params[:country].present?    params[:country] end   region  =  state  ||  country  ||  'US'
32. region  =  params[:state].presence  ||    params[:country].presence  ||  'US'
34. http://guides.rubyonrails.org
35. Thank you! Prem Sichanugrist (@sikachu) Sides: http://bit.ly/as-secret
36. Thank you! Prem Sichanugrist (@sikachu) Sides: http://bit.ly/as-secret I also have some stickers to give away