20150625_SpeeeTeckParty

Transcript

1. 3BJMT։ൃΛ͢Δ্Ͱ
   ஌͓͍ͬͯͨํ͕ྑͦ͞͏ͳ
   ̍̌ͷ͜ͱʢԾʣ 2015-06-25 @sasata299

2. ࣗݾ঺հ w ͨͭ͞͞
   w ώτϝσΟΞॴଐ
   w ͔Β͋͛ΤϯδχΞ
   w ٕज़ϒϩά

3. ͔Β͋͛
   ඒຯ͍͠

4. <13>
   ຊΛग़͠·ͨ͠

5. ͱ͍͏ࣄۀΛ΍͍ͬͯ·͢ɻ

6. ᶃ
   )BTIOFX
   \
   cI Lc
   I<L>
   
   \^
   ^
   ᶄ
   'BU
   .PEFM
   ᶅ
   $PODFSO
   ᶆ
   ϓϨθϯςʔγϣϯ૚
   ᶇ
   SBJMT
   DPOTPMF
   TBOECPY
   ᶈ
   QMVDL
   ᶉ
   pMUFS@QBSBNFUFST
   ᶊ
   ؔ࿈ͨ͠σʔλͷ࡟আ
   ᶋ
   γϯάϧςʔϒϧܧঝʢ45*ʣ
   

   ᶌ
   JODMVEF
   ͱ
   QSFQFOE

7. ஌ͬͱ͘ͱྑͦ͞͏ᶃ Hash.new { |h,k| h[k] = {} }

8. > hash = {} => {} > hash[:foo] => nil

9. > hash = Hash.new { |h,k| h[k] = {} }

   => {} > hash[:foo] => {} # nil͡Όͳ͍ʂ

10. > hash = Hash.new { |h,k| h[k] = {} }

    => {} > hash[:foo] => {} # nil͡Όͳ͍ʂ > hash[:foo][:bar] => nil > hash[:foo][:bar] = 1 => 1 > hash => { foo: { bar: 1 } }

11. ஌ͬͱ͘ͱྑͦ͞͏ᶄ Fat Model

12. Fat Controller Fat Model ??? ୭΋͕௨Δಓ

13. Fat Controller Fat Model ??? ୭΋͕௨Δಓ ServiceΦϒδΣΫτ FormΦϒδΣΫτ, etc..

14. ஌ͬͱ͘ͱྑͦ͞͏ᶅ Concern

15. ؔ৺ࣄΛͻͱ͔ͨ·Γʹͯ͠؅ཧ͢Δʂ

16. class Group before_save :set_default_name_if_need def post(comment); end end ! class

    Message before_save :set_default_name_if_need def post(comment); end end ಉ͡Α͏ͳॲཧ͕͋Δ৔߹

17. module Commentable extend ActiveSupport::Concern ! included do before_save :set_default_name_if_need end

    ! def post(comment) Comment.create!(content: comment) end end

18. class Group include Commentable end ! class Message include Commentable

    end εοΩϦ
    

19. ஌ͬͱ͘ͱྑͦ͞͏ᶆ ϓϨθϯςʔγϣϯ૚

20. ϑϧωʔϜΛද͍ࣔͨ͠ʂ

21. module UserHelper def full_name(user) user.last_name + user.first_name end end VTFSΦϒδΣΫτΛ౉͢ͷΠέͯͳ͍
    

22. class User < ActiveRecord::Base def full_name last_name + first_name end

    end 7JFXͰ͔͠࢖Θͳ͍ͷʹϞσϧʹஔ͘ʁ
    

23. module UserDecorator def full_name last_name + first_name end end ྫ͑͹BDUJWF@EFDPSBUPSΛ࢖͏

24. ஌ͬͱ͘ͱྑͦ͞͏ᶇ $ rails console —sandbox

25. $ rails console —sandbox > user = User.first => #<User

    id: 1, name: "sasata299", like: "karaage"> > user.like = "sushi" => "sushi" > u.save! => true

26. $ rails console —sandbox > user = User.first => #<User

    id: 1, name: "sasata299", like: "karaage"> > user.like = "sushi" => "sushi" > u.save! => true > user = User.first => #<User id: 1, name: "sasata299", like: "sushi">

27. $ rails console > user = User.first => #<User id:

    1, name: "sasata299", like: “karaage"> ࠶౓DPOTPMFΛ։͘ͱSPMMCBDL͞ΕͯΔ

28. $ rails console > user = User.first => #<User id:

    1, name: "sasata299", like: “karaage"> > _ => #<User id: 1, name: "sasata299", like: “karaage"> ͪͳΈʹΞϯμʔείΞศརͰ͢

29. ஌ͬͱ͘ͱྑͦ͞͏ᶈ pluck

30. ສ݅ͷ6TFSΛ༻ҙͯ͠JEͷҰཡΛऔಘ

31. Benchmark.bm 10 do |r| r.report “select” do User.select(:id).map(&:id) end r.report

    “pluck” do User.pluck(:id) end end

32. user system total real select 16.290000 0.760000 17.050000 ( 20.753481)

    pluck 4.350000 0.590000 4.940000 ( 6.712115) ഒҎ্଎͍ͧʂ

33. User.select(:id) [#<User id:1>, #<User id: 2>, …] ΦϒδΣΫτΛੜ੒ NBQ JE

    ͢Δ [1, 2, …]

34. User.pluck(:id) [1, 2, …] ActiveRecordΦϒδΣΫτͷ ੜ੒͕ൃੜ͠ͳ͍෼଎͍ʂ

35. ஌ͬͱ͘ͱྑͦ͞͏ᶉ filter_parameters

36. ͦͷ··ͩͱηΩϡΞͳ৘ใ͕
    ϩάʹྲྀΕͯ͠·͏ʂʂʼʻ

37. Started POST "/users" Processing by UsersController#create as HTML Parameters: {"email"=>"test@test.com",

    “password"=>"secret-value", “credit_card_number"=>"1111-2222-3333-4444"}

38. 3BJMTBQQMJDBUJPODPOpHpMUFS@QBSBNFUFST
    
    <QBTTXPSE
    DSFEJU@DBSE@OVNCFS> pMUFS@QBSBNFUFSTΛઃఆ͢Δ

39. Started POST "/users" Processing by UsersController#create as HTML Parameters: {"email"=>"test@test.com",

    "password"=>"[FILTERED]", “credit_card_number"=>"[FILTERED]"}

40. ஌ͬͱ͘ͱྑͦ͞͏ᶊ ؔ࿈ͨ͠σʔλͷ࡟আ

41. class Blog < ActiveRecord::Base has_many :articles dependent: :destroy end
    #MPHΛ࡟আͨ͠Βؔ࿈͢Δ"SUJDMF΋࡟আ͢Δ

42. EFMFUFͱEFTUSPZͷҧ͍ EFMFUF ୯७ʹ%&-&5&จ͕ൃߦ͞ΕΔ͚ͩ EFTUSPZ CFGPSF@EFTUSPZ΍BGUFS@EFTUSPZ΋࣮ߦ͞ΕΔ
    EFQFOEFOU΋ߟྀ͞ΕΔ

43. ஌ͬͱ͘ͱྑͦ͞͏ᶋ γϯάϧςʔϒϧܧঝʢ45*ʣ

44. ྑ͘ࣅͨϞσϧ͸ҰͭͷςʔϒϧͰѻ͓͏
    ! 'PPEϞσϧͱ%SJOLϞσϧ͸ྑ͘ࣅͯΔ͔Β
    QSPEVDUTςʔϒϧͰ·ͱΊͯѻ͓͏ʂతͳ࿩

45. class Product < ActiveRecord::Base # typeΧϥϜΛ͍࣋ͬͯΔ͜ͱʂ end ! class Food

    < Product; end class Drink < Product; end

46. Food.create! <#Food id: 1, type: "Food", …> ! 2.times {

    Drink.create! } <#Drink id: 2, type: "Drink", …> <#Drink id: 3, type: "Drink", …>

47. mysql> SELECT id, type FROM products; ! +----+-------+ | id

    | type | +----+-------+ | 1 | Food | | 2 | Drink | | 3 | Drink | +----+-------+

48. Food.all [#<Food id: 1, type: "Food", …>] ! Drink.all [#<Drink

    id: 2, type: "Drink", …>, #<Drink id: 3, type: "Drink", …>] ! Product.all [#<Food id: 1, type: "Food", …>, #<Drink id: 2, type: "Drink", …>, #<Drink id: 3, type: "Drink", …>]

49. ஌ͬͱ͘ͱྑͦ͞͏ᶌ include ͱ prepend

50. ೚ҙͷϝιουΛੜ΍͍ͨ͠

51. class Bar include Foo end ! p Bar.ancestors # [Bar,

    Foo, Object, …] #BSΫϥε͕༏ઌ͞ΕΔ

52. class Bar prepend Foo end ! p Bar.ancestors # [Foo,

    Bar, Object, …] 'PPϞδϡʔϧ͕༏ઌ͞ΕΔ

53. JODMVEFͱQSFQFOEͷڍಈͷҧ͍ JODMVEF ݩͷΫϥεͷޙΖʹ௥Ճ͞ΕΔ
    ಉ໊ͷϝιουͷ৔߹ɺݩͷΫϥε͕༏ઌ͞ΕΔ QSFQFOE ݩͷΫϥεΑΓલʹ௥Ճ͞ΕΔ
    ಉ໊ͷϝιουͷ৔߹ɺϞδϡʔϧ͕༏ઌ͞ΕΔ

54. ᶃ
    )BTIOFX
    \
    cI Lc
    I<L>
    
    \^
    ^
    ᶄ
    'BU
    .PEFM
    ᶅ
    $PODFSO
    ᶆ
    ϓϨθϯςʔγϣϯ૚
    ᶇ
    SBJMT
    DPOTPMF
    TBOECPY
    ᶈ
    QMVDL
    ᶉ
    pMUFS@QBSBNFUFST
    ᶊ
    ؔ࿈ͨ͠σʔλͷ࡟আ
    ᶋ
    γϯάϧςʔϒϧܧঝʢ45*ʣ
    

    ᶌ
    JODMVEF
    ͱ
    QSFQFOE

55. ࠷ޙʹ

56. https://www.wantedly.com/companies/hitomedia ΤϯδχΞืूͯ͠·͢ʂ

57. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ @sasata299