Rails on Two DBs

Transcript

1. 3BJMT
   PO
   5XP
   %#T :VJDIJSP
   ,BOFLP
   
   
   େߐށ3VCZձٞ
2. 8IP
   *
   BN
   ,BOFLP
   :VJDIJSP
   !ZVJLOL
3. ZVJLOL
   (JU)VC
   
   TQJLFPMBG
   UXJUUFS
   EPDSBJMT
   
   SBJMTHVJEFTKQ
   
   QSZ
   
   BDUJWF@EFDPSBUPS
   ΋ͱܦཧϚϯ
4. 3BJMTΨΠυ຋༁νʔϜ
5. &EHF
   3BJMT
6. IUUQTTQFBLFSEFDLDPNB@NBUTVEBSBJMTLBJGBGBMTFIJNJUV
7. <DJ
   TLJQ>
   
   
   
9. &EHF
   3BJMT $PNNJUFS
10. &EHF
    3BJMT $PNNJUFS
11. &EHF
    3BJMT $PNNJUFS ೔ຊਓͬΆ͍ਓ
12. IUUQZZBHJIBUFOBCMPHDPN
13. ࢲͱ"TBLVTBSC w େߐށ3VCZձٞ
    ࢀՃ
    
    w ॳࢀՃ͸z"TBLVTBSC
    ճه೦
    ͓ॕ͍ձz
    
    w ݄ʹճ͘Β͍ࢀՃ
    w 3BJMTͷ͜ͱͱ͔ɺ3VCZͷ͜ͱͱ͔ΛDPNNJUFS ͷਓʹ૬ஊ
14. 3VCZʹݶΒͣɺ࿩ऀ͕ݱ ࡏڵຯͷ͋Δ໘ന͍಺༰
15. ໘ന͍
    ͱ͸
16. 3BJMTͱෳ਺%#
17. ෳ਺%#
    ͱ͸
18. ෳ਺%# w %#෼ׂʁ
    w 38
    TQMJUUJOH
    w γϟʔσΟϯάʁ IUUQTTQFBLFSEFDLDPNFBHMFUNUGVTIVECUPSBJMT
19. 38
    TQMJUUJOH TXJUDI@QPJOU
20. γϟʔσΟϯά NJYFE@HBVHF
21. 0DUPQVT ஌Βͳ͍ࢠͰ͢Ͷ
22. ΧδϡΞϧͳ%#෼ׂ w ࠓճ͸ෛՙ෼ࢄ͕໨తͰ͸ͳ͘
    w ͋ΔαʔϏεͷಛఆͷ5BCMF 6TFST ΛଞͷαʔϏ εͰ΋࢖͍͍ͨ
    w 3BJMT
    
    
    .Z42-
    
23. w 6TFST
    w 3FMBUJPOTIJQT
    w .JDSPQPTUT
    w ʜ w 6TFST
    
    w 3FMBUJPOTIJQT
    w 'FFET
    w ʜ mysql> show databases; +-----------------------------+ | Database | +-----------------------------+ | service1_development | | service2_development | | service1_test | | service2_test | +-----------------------------+ 2 rows in set (0.00 sec) 4FSWJDF 4FSWJDF
24. IUUQTHJUIVCDPNSBJMTSBJMTUSFF WBDUJWFSFDPSEUFTUDBTFT NVMUJQMF@EC@UFTUSC
    
25. ʜ ݁ߏੲ͔Β͋Δ
26. BDUJWFSFDPSEUFTUDBTFT NVMUJQMF@EC@UFTUSC w Ұݟɺ-(5.ʹΈ͑Δ͡Όͳ͍Ͱ͔͢ def test_associations c1 = Course.find(1) assert_equal 2, c1.entrants.count e1 = Entrant.find(1) assert_equal e1.course.id, c1.id c2 = Course.find(2) assert_equal 1, c2.entrants.count e3 = Entrant.find(3) assert_equal e3.course.id, c2.id end
27. ෳࡶͳ"TTPDJBUJPO w 5FBDIFST
    w $PMMFHF5FBDIFST w $PMMFHFT
    %BUBCBTF %BUBCBTF $PMMFHF5FBDIFS $PMMFHF 5FBDIFS /
    
     /
    
28. ෳࡶͳ"TTPDJBUJPO # OK SELECT `teachers`.* FROM `teachers` INNER JOIN `college_teachers` ON `teachers`.`id` = `college_teachers`.`teacher_id` WHERE `college_teachers`.`college_id` = 1 # NG SELECT `colleges`.* FROM `colleges` INNER JOIN `college_teachers` ON `colleges`.`id` = `college_teachers`.`college_id` WHERE `college_teachers`.`teacher_id` = 1 # OK college.teachers # NG teacher.colleges
29. ෳࡶͳ"TTPDJBUJPO # OK SELECT `teachers`.* FROM `teachers` INNER JOIN `college_teachers` ON `teachers`.`id` = `college_teachers`.`teacher_id` WHERE `college_teachers`.`college_id` = 1 # NG SELECT `colleges`.* FROM `colleges` INNER JOIN `college_teachers` ON `colleges`.`id` = `college_teachers`.`college_id` WHERE `college_teachers`.`teacher_id` = 1 # OK college.teachers # NG teacher.colleges
30. DPMMFHFUFBDIFST $PMMFHF5FBDIFS $PMMFHF 5FBDIFS /
    
     /
     +0*/Մೳ
31. UFBDIFSDPMMFHFT $PMMFHF5FBDIFS $PMMFHF 5FBDIFS /
    
     /
     +0*/ ෆ Մೳ
32. EBUBCBTF໊Λ
    ΫΤϦʹؚΊΔ # BEFORE SELECT `colleges`.* FROM `colleges` INNER JOIN `college_teachers` ON `colleges`.`id` = `college_teachers`.`college_id` WHERE `college_teachers`.`teacher_id` = 1 # AFTER SELECT `database2`.`colleges`.* FROM `database2`.`colleges` INNER JOIN `database1`.`college_teachers` ON `database1`.`colleges`.`id` = `database1`.`college_teachers`.`college_id` WHERE `database1`.`college_teachers`.`teacher_id` = 1
33. "SFMΛ֦ுͩ
34. --- a/lib/arel/table.rb +++ b/lib/arel/table.rb @@ -6,7 +6,7 @@ module Arel @engine = nil class << self; attr_accessor :engine; end - attr_accessor :name, :engine, :aliases, :table_alias + attr_accessor :name, :engine, :aliases, :table_alias, :database_name @@ -18,6 +18,7 @@ module Arel @aliases = [] @table_alias = nil @primary_key = nil + @database_name = nil --- a/lib/arel/visitors/to_sql.rb +++ b/lib/arel/visitors/to_sql.rb @@ -612,6 +612,7 @@ module Arel end def visit_Arel_Table o, collector + collector << "#{quote_table_name o.database_name}." if o.database_name if o.table_alias collector << "#{quote_table_name o.name} #{quote_table_name o.table_alias}" else
35. --- a/activerecord/lib/active_record/core.rb +++ b/activerecord/lib/active_record/core.rb @@ -235,7 +235,9 @@ module ActiveRecord # scope :published_and_commented, -> { published.and(self.arel_table[:comments_count].gt(0)) } # end def arel_table # :nodoc: - @arel_table ||= Arel::Table.new(table_name, arel_engine) + @arel_table ||= Arel::Table.new(table_name, arel_engine).tap {|a| + a.database_name = connection.instance_variable_get(:@config)[:database] if connection.instance_variable_get(:@config) + } end --- a/Gemfile +++ b/Gemfile @@ -124,3 +125,5 @@ end # A gem necessary for ActiveRecord tests with IBM DB gem 'ibm_db' if ENV['IBM_DB'] + +gem 'arel', github: 'yui-knk/arel', branch: 'feature/database_name'
36. 3BJMTͷςετ͕͚͜Δ ActiveRecord::ConnectionAdapters::Mysql2SchemaTest#test_schema: ActiveRecord::StatementInvalid: Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.`posts` ORDER BY `activerecord_unittest`.`posts`.`id` ASC LIMIT 1’ at line 1: SELECT `activerecord_unittest`.`posts`.* FROM `activerecord_unittest`.`activerecord_unittest`.`posts` ORDER BY `activerecord_unittest`.`posts`.`id` ASC LIMIT 1 ... ruby/rails/activerecord/test/cases/adapters/mysql2/schema_test.rb:23:in `test_schema'
37. UFTUDBTFTBEBQUFST NZTRMTDIFNB@UFTUSC def setup @connection = ActiveRecord::Base.connection db = Post.connection_pool.spec.config[:database] table = Post.table_name @db_name = db @omgpost = Class.new(ActiveRecord::Base) do self.table_name = "#{db}.#{table}" def self.name; 'Post'; end end end def test_schema assert @omgpost.first end
38. "3UBCMF@OBNF class College < ActiveRecord::Base self.table_name = "database2.colleges" end class CollegeTeacher < ActiveRecord::Base self.table_name = "database1.college_teachers" end class Teacher < ActiveRecord::Base self.table_name = "database1.teachers" end
39. 1SPCMFNT w (FN ""4. ͷΫΤϦ
    w .JHSBUJPO
    w 3BJMTଆͷαϙʔτ
40. ""4. class User < ActiveRecord::Base include AASM aasm column: :status do state :sleeping #... end end User.sleeping # => "SELECT `database1`.`users`.* FROM `database1`.`users` WHERE `database1`.`users.status` = 'sleeping'"
41. ""4. conditions = {"#{@klass.table_name}.#{@klass.aasm(@name).attribute_name}" => name.to_s} if ActiveRecord::VERSION::MAJOR >= 3 @klass.class_eval do scope name, lambda { where(conditions) } end else @klass.class_eval do named_scope name, :conditions => conditions end end
42. 3BJMT
     ͓޷ΈͰ͸ͳ͍༷ࢠ
43. .JHSBUJPO w ։ൃ EFWFMPQ ͱςετ UFTU Ͱ͸6TFSTςʔϒϧͷ .JHSBUJPOϑΝΠϧ͕΄͍͠
    w SJEHFQPMF
    HFNͰEVNQͯࠩ͠෼ΛͱΔ w 6TFST
    w 3FMBUJPOTIJQT
    w .JDSPQPTUT
    w ʜ w 6TFST
    
    w 3FMBUJPOTIJQT
    w 'FFET
    w ʜ 4FSWJDF
    3FQPTJUPSZ 4FSWJDF
    3FQPTJUPSZ
44. .JHSBUJPO # In Repository1 bundle exec ridgepole -c config/database.yml --export --split --output schemas/ Schemafile # In Repository2 bundle exec ridgepole -c config/database.yml --export --split --output schemas/ Schemafile # In Repository2 bundle exec ridgepole -c config/database.yml --diff schemas/users.schema ../ repository1/schemas/users.schema #add_column("users", "name", :string, {:after=>"id", :limit=>255}) # ALTER TABLE `users` ADD `name` varchar(255) AFTER `id`
45. αϙʔτ
    ͱ͸
46. 3BJMTͷαϙʔτ
47. 3BJMTͷαϙʔτ յΕͨ
48. 3BJMTͷαϙʔτ ઌिؾ͕͍ͭͨ
49. 3BJMTͷαϙʔτ ܧଓ৹ٞத
50. ݁ߏલ͔Βͩͬͨɻɻɻ
51. ·ͱΊ w 5FTUΛΑΜͰΈΔ
    w NBTUFSϒϥϯνΛ͞ΘͬͯΈΔ
    w 3BJMΛෑ͍ͯΈΔ φΠενϟϨϯδ
52. ·ͱΊ
    
53. 5IBOL
    ZPV
     IUUQTXXXqJDLSDPNQIPUPTUBNCBLP