Downloaded 20 times
![Post.find_by
# => #<Post id:1, title: "Example", ...>
Post.where
# => #<ActiveRecord::Relation [#<Post ...>]>](https://image.slidesharecdn.com/railsconfpresentation-170425201649/75/Perusing-the-Rails-Source-Code-36-2048.jpg)
![Post.method(:create).source_location
=> [“…/lib/active_record/persistence.rb”, 29]
~/blog ❯ rails console](https://image.slidesharecdn.com/railsconfpresentation-170425201649/75/Perusing-the-Rails-Source-Code-40-2048.jpg)
![Post.new.method(:save).source_location
=> [“…/lib/active_record/suppressor.rb”, 41]](https://image.slidesharecdn.com/railsconfpresentation-170425201649/75/Perusing-the-Rails-Source-Code-42-2048.jpg)
![41: def save(*) # :nodoc:
=> 42: SuppressorRegistry.suppressed[self.class.name] ?
true : super
43: end
activerecord/lib/active_record/suppressor.rb](https://image.slidesharecdn.com/railsconfpresentation-170425201649/75/Perusing-the-Rails-Source-Code-45-2048.jpg)
![post = Post.new
post.method(:save).source_location
=> [“. . . /suppressor.rb”]
post.method(:save).super_method.source_location
=> [“. . . /transactions.rb”]](https://image.slidesharecdn.com/railsconfpresentation-170425201649/75/Perusing-the-Rails-Source-Code-50-2048.jpg)
![require “pry”
. . .
post = Post.create(title: “Hello”)
binding.pry
[1] pry(main)>](https://image.slidesharecdn.com/railsconfpresentation-170425201649/75/Perusing-the-Rails-Source-Code-59-2048.jpg)
![require “pry”
. . .
post = Post.create(title: “Hello”)
binding.pry
[1] pry(main)> Post.all
=> [#<Post id: 1, title: "Hello">]](https://image.slidesharecdn.com/railsconfpresentation-170425201649/75/Perusing-the-Rails-Source-Code-60-2048.jpg)
![[31, 33] in active_record_master.rb
31:
32: byebug
=> 33: Post.create
(byebug) s](https://image.slidesharecdn.com/railsconfpresentation-170425201649/75/Perusing-the-Rails-Source-Code-62-2048.jpg)
Uploaded byAlex Kitchens
Perusing the Rails Source Code
The document is a detailed exploration of the Rails source code, focusing on its structure and components like ActionCable, ActionMailer, ActionPack, and ActiveJob. It includes practical examples and commands that demonstrate how to interact with Rails and its ActiveRecord features, showcasing the creation and manipulation of records. Additionally, it highlights the intricacies of Rails development, such as dependency management and utilizing Git for version control.
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- 1. @alexcameron89 PERUSING THE RAILSSOURCE CODE A BEGINNERS GUIDE
- 2.
- 3.
- 4.
- 5.
- 6. You might experience anincrease in Ruby knowledge
- 7. You might experience anincrease in Git knowledge
- 8.
- 9. Rails GitHub Repository RailsDependencies Setup guides.rubyonrails.org/development_dependencies_install github.com/rails/rails
- 10.
- 11.
- 12. ~ ❯ railsserver
- 13. Request ~ ❯ railsserver
- 14. Routes Request ~ ❯ railsserver
- 15.
- 16. Controller Routes Request ~ ❯ railsserver Model
- 17. Controller Routes Request ~ ❯ railsserver View Model
- 18. Controller Routes Request ~ ❯ railsserver View Model
- 19. Controller Routes Request Response ~ ❯ railsserver View Model
- 20. Controller Routes ActionPack Request Response ~ ❯ railsserver View Model
- 21.
- 22.
- 23. Controller ActiveRecord ActiveModel Routes ActionPack ActionView Request Response ~ ❯ railsserver View Model Railties
- 24. Controller ActiveRecord ActiveModel Routes ⋆ ⋆ ⋆ ⋆ ActiveSupport ActionPack ActionView Request Response ~ ❯rails server View Model Railties
- 25.
- 26. + Your Story tenderlovegithub ActionMailer Mail Delivery ActiveJob Jobs/Tasks ActionCable Integrated WebSockets
- 27. + Your Story tenderlovegithub ActionMailer Mail Delivery ActiveJob Jobs/Tasks ActionCable Integrated WebSockets tenderlove Aaron Patterson What room are you in? South Ballroom
- 28.
- 29. lib test README.rdoc activerecord.gemspec CHANGELOG.md bin examples MIT-LICENSE RUNNING_UNIT_TESTS.rdoc ~/rails ❯ cdactiverecord/ ~/rails/activerecord ❯ ls
- 30. s.add_dependency "activesupport", version s.add_dependency"activemodel", version s.add_dependency "arel", "~> 8.0" activerecord/active_record.gemspec
- 31. ~/rails/activerecord ❯ cdlib ~/rails/activerecord/lib ❯ ls active_record rails active_record.rb
- 32. attributes.rb attribute_mutation_tracker.rb base.rb persistence.rb reflection.rb relation.rb schema.rb . . . ~/rails/activerecord/lib❯ cd active_record ~/rails/activerecord/lib/active_record ❯ ls
- 34. ~/rails/activerecord/lib ❯ cdactive_record ~/rails/activerecord/lib/active_record ❯ ls attributes.rb attribute_mutation_tracker.rb base.rb persistence.rb reflection.rb relation.rb schema.rb . . .
- 35. ~/rails/activerecord/lib ❯ cdactive_record ~/rails/activerecord/lib/active_record ❯ ls attributes.rb attribute_mutation_tracker.rb base.rb persistence.rb reflection.rb relation.rb schema.rb . . .
- 36. Post.find_by # => #<Postid:1, title: "Example", ...> Post.where # => #<ActiveRecord::Relation [#<Post ...>]>
- 37. activerecord/lib/active_record/relation/finder_methods.rb 77 def find_by(arg,*args) 78 where(arg, *args).take 79 rescue ::RangeError 80 nil 81 end
- 38.
- 39.
- 40.
- 41. activerecord/lib/active_record/persistence.rb 29 def create(attributes= nil, &block) . . . 33 object = new(. . .) 34 object.save 35 object 36 . . . 37 end
- 42.
- 44.
- 45. 41: def save(*)# :nodoc: => 42: SuppressorRegistry.suppressed[self.class.name] ? true : super 43: end activerecord/lib/active_record/suppressor.rb
- 46. 306: def save(*)#:nodoc: 307: rollback_active_record_state! do => 308: with_transaction_returning_status { super } 309: end 310: end activerecord/lib/active_record/transactions.rb
- 47. 34: def save(*) =>35: if status = super 36: changes_applied 37: end 38: status 39: end activerecord/lib/active_record/attribute_methods/dirty.rb
- 48. 43: def save(options= {}) => 44: perform_validations(options) ? super : false 45: end activerecord/lib/active_record/validations.rb
- 49. 124: def save(*args) =>125: create_or_update(*args) 126: rescue ActiveRecord::RecordInvalid 127: false 128: end activerecord/lib/active_record/persistence.rb
- 50. post = Post.new post.method(:save).source_location =>[“. . . /suppressor.rb”] post.method(:save).super_method.source_location => [“. . . /transactions.rb”]
- 51.
- 52. ~/rails ❯ lsrails/guides/bug_report_templates/ action_controller_master.rb active_job_master.rb active_record_master.rb active_record_migrations_master.rb benchmark.rb generic_master.rb
- 53. require "bundler/inline" gemfile(true) do source"https://rubygems.org" gem "rails", github: "rails/rails" gem "arel", github: "rails/arel" gem "sqlite3" # or "pg" or "mysql2" . . . end require "active_record" require "minitest/autorun" require "logger"
- 54. require "bundler/inline" gemfile(true) do source"https://rubygems.org" gem "rails", path: “path/to/your/rails“ gem "arel", github: "rails/arel" gem "sqlite3" # or "pg" or "mysql2" . . . end require "active_record" require "minitest/autorun" require "logger"
- 55. ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:") ActiveRecord::Base.logger= Logger.new(STDOUT) ActiveRecord::Schema.define do create_table :posts do |t| t.string :title end end class Post < ActiveRecord::Base end . . .
- 56. . . . classBugTest < Minitest::Test def test_association_stuff post = Post.create(title: “Hello”) assert_equal “Hello”, post.title end end
- 57. . . . classBugTest < Minitest::Test def test_association_stuff post = Post.create(title: “Hello”) assert_equal “Hello”, post.title end end
- 58. . . . post= Post.create(title: “Hello”)
- 59. require “pry” . .. post = Post.create(title: “Hello”) binding.pry [1] pry(main)>
- 60. require “pry” . .. post = Post.create(title: “Hello”) binding.pry [1] pry(main)> Post.all => [#<Post id: 1, title: "Hello">]
- 61. require “byebug” . .. byebug Post.create(title: "Fancy Post")
- 62. [31, 33] inactive_record_master.rb 31: 32: byebug => 33: Post.create (byebug) s
- 63. in activerecord/lib/active_record/persistence.rb 29: defcreate(attributes = nil, &block) => 30: if attributes.is_a?(Array) . . . 32: else 33: object = new(attributes, &block) (byebug) n
- 64. in activerecord/lib/active_record/persistence.rb 29: defcreate(attributes = nil, &block) 30: if attributes.is_a?(Array) . . . 32: else => 33: object = new(attributes, &block) (byebug) var local
- 65. in activerecord/lib/active_record/persistence.rb 29: defcreate(attributes = nil, &block) 30: if attributes.is_a?(Array) . . . 32: else => 33: object = new(attributes, &block) (byebug) var local attributes = {:title=>"Hello"} block = nil
- 66. It can betroubling to know simultaneously the exact value and correct execution of a variable. - Werner Heisenbug
- 67. I know thisI don’t know this Association Reflection Attributes Attribute Mutation Tracker Relation . . .
- 68. I know thisI don’t know this Association Reflection Attributes Attribute Mutation Tracker Relation . . .
- 69.
- 70.
- 71. def define_method_attribute=(name) safe_name =name.unpack("h*".freeze).first . . . generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 def __temp__#{safe_name}=(value) . . . end alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= undef_method :__temp__#{safe_name}= STR end activerecord/lib/active_record/attribute_methods/write.rb Creates post.title=
- 72. def define_method_attribute=(name) safe_name =name.unpack(“h*".freeze).first . . . generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 def __temp__#{safe_name}=(value) . . . end alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= undef_method :__temp__#{safe_name}= STR end activerecord/lib/active_record/attribute_methods/write.rb => “479647c656”
- 73. def define_method_attribute=(name) safe_name =name.unpack(“h*".freeze).first . . . generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 def __temp__#{safe_name}=(value) . . . end alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= undef_method :__temp__#{safe_name}= STR end activerecord/lib/active_record/attribute_methods/write.rb
- 74. def define_method_attribute=(name) safe_name =name.unpack(“h*".freeze).first . . . generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 def __temp__#{safe_name}=(value) . . . end alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= undef_method :__temp__#{safe_name}= STR end activerecord/lib/active_record/attribute_methods/write.rb => “__temp__479647c656”
- 75. def define_method_attribute=(name) safe_name =name.unpack(“h*".freeze).first . . . generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 def __temp__#{safe_name}=(value) . . . end alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= undef_method :__temp__#{safe_name}= STR end activerecord/lib/active_record/attribute_methods/write.rb
- 76. def define_method_attribute=(name) safe_name =name.unpack(“h*".freeze).first . . . generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 def __temp__#{safe_name}=(value) . . . end alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= undef_method :__temp__#{safe_name}= STR end activerecord/lib/active_record/attribute_methods/write.rb
- 77. def define_method_attribute=(name) safe_name =name.unpack(“h*".freeze).first . . . generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 def __temp__#{safe_name}=(value) . . . end alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= undef_method :__temp__#{safe_name}= STR end activerecord/lib/active_record/attribute_methods/write.rb
- 78. def define_method_attribute=(name) safe_name =name.unpack(“h*".freeze).first . . . generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 def #{name}=(value) . . . end alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= undef_method :__temp__#{safe_name}= STR end activerecord/lib/active_record/attribute_methods/write.rb
- 79. def define_method_attribute=(name) safe_name =name.unpack(“h*".freeze).first . . . generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 def #{name}=(value) . . . end alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= undef_method :__temp__#{safe_name}= STR end activerecord/lib/active_record/attribute_methods/write.rb
- 80. def define_method_attribute=(name) safe_name =name.unpack(“h*".freeze).first . . . generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 def #{name}=(value) . . . end STR end activerecord/lib/active_record/attribute_methods/write.rb
- 81. 1) Error: BasicsTest#test_non_valid_identifier_column_name: SyntaxError: formalargument cannot be a global variable def a$b=(value) def test_non_valid_identifier_column_name weird = Weird.create("a$b" => "value") weird.reload assert_equal "value", weird.send("a$b") assert_equal "value", weird.read_attribute("a$b") . . . end activerecord/lib/active_record/attribute_methods/write.rb
- 82.
- 83. ~/rails ❯ gitblame . . . 7c70430c Ryuta Kamizono 2016-08-23 def __temp__#{safe_name}=(value) 7c70430c Ryuta Kamizono 2016-08-23 name = . . . 7c70430c Ryuta Kamizono 2016-08-23 write_attribute(name, value) 7c70430c Ryuta Kamizono 2016-08-23 end . . .
- 84. --- a/activerecord/lib/active_record/attribute_methods/write.rb +++ b/activerecord/lib/active_record/attribute_methods/write.rb @@-15,13 +15,13 @@ def define_method_attribute=(name) ActiveRecord::AttributeMethods::AttrNames.set_name_cache safe_name, name generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1 - def __temp__#{safe_name}=(value) - name = ::ActiveRecord::AttributeMethods::AttrNames::ATTR_#{safe_name} - write_attribute(name, value) - end - alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= - undef_method :__temp__#{safe_name}= - STR + def __temp__#{safe_name}=(value) + name = ::ActiveRecord::AttributeMethods::AttrNames::ATTR_#{safe_name} + write_attribute(name, value) + end + alias_method #{(name + '=').inspect}, :__temp__#{safe_name}= + undef_method :__temp__#{safe_name}= + STR end end
- 85. ~/rails ❯ gitblame -w . . . b785e921 Aaron Patterson 2013-07-03 def __temp__#{safe_name}=(value) b785e921 Aaron Patterson 2013-07-03 name = . . . b785e921 Aaron Patterson 2013-07-03 write_attribute(name, value) b785e921 Aaron Patterson 2013-07-03 end . . .
- 86. ~/rails ❯ gitlog -S "alias_method #{(name + '=').inspect}" commit b785e921d186753d905c1d0415b91d0987958028 Author: Aaron Patterson <lovingtenderly@tenderlove.com> Date: Wed Jul 3 14:18:31 2013 -0700 method transplanting between modules isn't supported on 1.9 commit 55ac7db11bd2fc0cf06d7184f013018fa4be0e9a Author: Aaron Patterson <lovingtenderly@tenderlove.com> Date: Wed Jul 3 10:56:56 2013 -0700 keep a cache of writer methods . . .
- 87. ~/rails ❯ gitlog --patch --pickaxe-all -S "alias_method #{(name + '=').inspect}" commit b785e921d186753d905c1d0415b91d0987958028 Author: Aaron Patterson <lovingtenderly@tenderlove.com> Date: Wed Jul 3 14:18:31 2013 -0700 method transplanting between modules isn't supported on 1.9 --- a/activerecord/lib/active_record/attribute_methods/read.rb +++ b/activerecord/lib/active_record/attribute_methods/read.rb @@ -1,3 +1,5 @@ +require 'active_support/core_ext/module/method_transplanting' + module ActiveRecord module AttributeMethods @@ -62,9 +64,30 @@ def cache_attribute?(attr_name)
- 88. ~/rails ❯ gitlog --reverse --patch --pickaxe-all -S "alias_method #{(name + '=').inspect}" commit f1765019ce9b6292f2264b4601dad5daaffe3a89 Author: Jon Leighton <j@jonathanleighton.com> Date: Fri Oct 12 12:33:11 2012 +0100 Don't allocate new strings in compiled attribute methods --- a/activerecord/lib/active_record/attribute_methods/write.rb +++ b/activerecord/lib/active_record/attribute_methods/write.rb @@ -9,15 +9,19 @@ module Write module ClassMethods protected - def define_method_attribute=(attr_name) - if attr_name =~ ActiveModel::AttributeMethods::NAME_COMPILABLE_REGEXP
- 89. ❯ Initial Commit commitbaa237c974fee8023dd704a4efb418ff0e963de0 Author: Santiago Pastorino <santiago@wyeworks.com> Date: Mon Mar 21 21:36:05 2011 -0300 Allow to read and write AR attributes with non valid identifiers
- 90.
- 93.
- 94. DEPRECATION WARNING: `redirect_to:back` is deprecated and will be removed from Rails 5.1. Please use `redirect_back(fallback_location: fallback_location)` . . .
- 95. ~/rails ❯ gitlog -S "Please use `redirect_back(fallback_loc"
- 96. ~/rails ❯ gitlog -S "Please use `redirect_back(fallback_loc" commit 13fd5586cef628a71e0e2900820010742a911099 Author: Derek Prior Date: Tue Dec 15 20:17:32 2015 -0500 Add `redirect_back` for safer referrer redirects . . . When there is no referrer available on the request, `redirect_to :back` will raise `ActionController::RedirectBackError`, usually resulting in an application error. . . .
- 99.
- 100.
- 101.
- 102.
- 103. Discussion between Contributors &Maintainers
- 104.
- 105.
- 106.
- 107. Takeaways from PRs& Issues
- 110.
- 111.
- 112. the_act_of_making_love_tenderly.rb I am aputs debuggerer tenderlovemaking.com Aaron Patterson
- 113. you_should_tell.rb eileencodes.com/speaking/ Breaking Down the Barrier:Demystifying Contributing to Rails System Tests PR github.com/rails/rails/pull/26703 Eileen Uchitelle
- 114. hi_sean_hi_derek.rb The Bike Shed @_bikeshed DerekPrior Sean Griffin Amanda Hill
- 115.
- 116. fxn.rb The Rails BootProcess https://youtu.be/vSza2FZucV8 Xavier Noria
- 117.