20150625_SpeeeTeckParty

6/25に開催された、SpeeeTeckPartyで話したときに資料です。

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