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Prying Open the Black Box

Prying Open the Black Box

Every once a while, Rails might behave in strange ways that you did not expect, and it could be difficult to figure out what is really going on. Was it a bug in the framework? Could it be one of the gems I am using? Did I do something wrong?

In this session, we will look at some tips, tricks and tools to help you debug your Rails issues. Along the way, you will also learn how to dive into the Rails codebase without getting lost. The next time you a mysterious bug finds its way into your Rails applications, you will be well-equipped to pry open the black box yourself!

22bb3e56828870ee9a0dd93aeadbe04a?s=128

Godfrey Chan

April 21, 2015
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Transcript

  1. None
  2. @chancancode

  3. Ƅ

  4. None
  5. None
  6. http://rails-weekly.goodbits.io

  7. None
  8. None
  9. gem install canada

  10. >> require 'canada' => true >> [].empty_eh? => true >>

    [1,2,3].empty_eh? => false
  11. October 2015 @ vancouver ruby

  12. Software Writer

  13. I have a very particular set of skills, skills I

    have acquired over a very long career. Skills that make me a nightmare for bugs like you. I will look for you, I will find you, and I will fix you. What I Think I Do
  14. What I Actually Do

  15. What My Clients Think I Do

  16. Rails

  17. Magic

  18. Black Magic

  19. Rails has no magic folks, it has sane defaults and

    conventions, take a "magical" feeling as "I need to grok the docs on this" Xavier Noria @fxn
  20. @fxn it feels like magic because even before you grok

    it, it still works. The cost of learning is not piled on up front. Sebastian Delmont @sd
  21. Black Magic

  22. Black Box

  23. Pry Open The Black Box

  24. NoMethodError NameError TypeError WrongEncodingError ArgumentError Circular dependency detected while autoloading

    consta veRecord::StatementInvalid Redis::CannotConn RangeError ActiveRecord::Subclas JSON::ParserError Dalli::RingErro SystemStackEr ActiveJob::DeserializationErro RuntimeError
  25. Take a deep breath.

  26. 1. You wrote some code

  27. 1. You wrote some code 2. You ran the code

  28. 1. You wrote some code 2. You ran the code

    3. You expected something to happen
  29. 1. You wrote some code 2. You ran the code

    3. You expected something to happen 4. That didn’t happen
  30. 1. You wrote the code 2. You ran the code

    3. You expected something to happen 4. That didn’t happen
  31. 1. You wrote the code 2. You have access to

    the code 3. You expected something to happen 4. That didn’t happen
  32. 1. You wrote the code 2. You have access to

    the code 3. You know what went wrong 4. That didn’t happen
  33. 1. You wrote the code 2. You have access to

    the code 3. You know what went wrong 4. Your bug is not going anywhere
  34. Documentation

  35. http://api.rubyonrails.org/ Latest Stable Release

  36. http://api.rubyonrails.org/ Latest Stable Release http://api.rubyonrails.org/v4.1.10/ Arbitrary Version

  37. http://api.rubyonrails.org/ Latest Stable Release http://api.rubyonrails.org/v4.1.10/ Arbitrary Version http://edgeapi.rubyonrails.org/ Edge Rails

  38. http://guides.rubyonrails.org/ Latest Stable Release

  39. http://guides.rubyonrails.org/ Latest Stable Release http://guides.rubyonrails.org/v4.1.10/ Arbitrary Version

  40. http://guides.rubyonrails.org/ Latest Stable Release http://guides.rubyonrails.org/v4.1.10/ Arbitrary Version http://edgeguides.rubyonrails.org/ Edge Rails

  41. Updating Rails

  42. Rails 4.2.1

  43. Rails 4.2.1 Major Version

  44. Rails 4.2.1 “Minor” Version

  45. Rails 4.2.1 Patch Version

  46. Rails 4.2.1 Release Series

  47. gem “rails”, github: “rails/rails”, branch: “4-2-stable”

  48. Stack Trace

  49. ActiveRecord::SubclassNotFound (The single-table inheritance...): app/models/user.rb:3:in `ensure_permission' app/models/post.rb:5:in `ensure_author' app/controllers/posts_controller.rb:30:in `block

    in create' app/controllers/posts_controller.rb:29:in `create'
  50. app/models/user.rb:3:in `ensure_permission' app/models/post.rb:5:in `ensure_author' app/controllers/posts_controller.rb:30:in `block in create' app/controllers/posts_controller.rb:29:in `create'

  51. PostsController (block in #create) Post#ensure_author User#ensure_permission PostsController#create app/models/user.rb:3:in `ensure_permission' app/models/post.rb:5:in

    `ensure_author' app/controllers/posts_controller.rb:30:in `block in create' app/controllers/posts_controller.rb:29:in `create'
  52. PostsController (block in #create) Post#ensure_author User#ensure_permission PostsController#create class PostsController <

    ... def create @post = Post.new(post_params) respond_to do |format| if @post.save ... end end end end
  53. PostsController (block in #create) Post#ensure_author User#ensure_permission PostsController#create class PostsController <

    ... def create @post = Post.new(post_params) respond_to do |format| if @post.save ... end end end end
  54. PostsController (block in #create) Post#ensure_author User#ensure_permission PostsController#create class Post <

    ActiveRecord::Base belongs_to :author, class_name: "User" before_save :ensure_author def ensure_author author.ensure_permission(:authorship) end end
  55. PostsController (block in #create) Post#ensure_author User#ensure_permission PostsController#create class User <

    ActiveRecord::Base has_many :permissions has_many :posts def ensure_permission(role) permissions.find_by_type!(role) end end
  56. PostsController (block in #create) Post#ensure_author User#ensure_permission PostsController#create ActiveRecord::SubclassNotFound (The single-table

    inheritance...): app/models/user.rb:3:in `ensure_permission' app/models/post.rb:5:in `ensure_author' app/controllers/posts_controller.rb:30:in `block in create' app/controllers/posts_controller.rb:29:in `create'
  57. app/models/user.rb:3:in `ensure_permission' app/models/post.rb:5:in `ensure_author' ? ? ? ? ? ?

    ? ? ? ? app/controllers/posts_controller.rb:30:in `block in create' app/controllers/posts_controller.rb:29:in `create' ? ? ? ? ? ? ? ? ? ?
  58. Backtrace Cleaner

  59. # Be sure to restart your server when you modify

    this file. # You can add backtrace silencers for libraries that you're # using but don't wish to see in your backtraces. # # Rails.backtrace_cleaner.add_silencer do |line| # line =~ /my_noisy_library/ # end # You can also remove all the silencers if you're trying to # debug a problem that might stem from framework code. # # Rails.backtrace_cleaner.remove_silencers! config/initializers/backtrace_silencers.rb
  60. # Be sure to restart your server when you modify

    this file. # You can add backtrace silencers for libraries that you're # using but don't wish to see in your backtraces. # # Rails.backtrace_cleaner.add_silencer do |line| # line =~ /my_noisy_library/ # end # You can also remove all the silencers if you're trying to # debug a problem that might stem from framework code. Rails.backtrace_cleaner.remove_silencers! config/initializers/backtrace_silencers.rb
  61. ActiveRecord::SubclassNotFound (The single-table inheritance...): /rails/activerecord/lib/active_record/inheritance.rb:176:in `rescue in find_sti_class' /rails/activerecord/lib/active_record/inheritance.rb:170:in `find_sti_class'

    /rails/activerecord/lib/active_record/inheritance.rb:159:in `discriminate_class_for_record' /rails/activerecord/lib/active_record/persistence.rb:67:in `instantiate' /rails/activerecord/lib/active_record/querying.rb:50:in `block (2 levels) in find_by_sql' /rails/activerecord/lib/active_record/result.rb:51:in `block in each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/querying.rb:50:in `map' /rails/activerecord/lib/active_record/querying.rb:50:in `block in find_by_sql' /rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument' /rails/activerecord/lib/active_record/querying.rb:49:in `find_by_sql' /rails/activerecord/lib/active_record/statement_cache.rb:107:in `execute'
  62. ActiveRecord::SubclassNotFound (The single-table inheritance...): /rails/activerecord/lib/active_record/inheritance.rb:176:in `rescue in find_sti_class' /rails/activerecord/lib/active_record/inheritance.rb:170:in `find_sti_class'

    /rails/activerecord/lib/active_record/inheritance.rb:159:in `discriminate_class_for_record' /rails/activerecord/lib/active_record/persistence.rb:67:in `instantiate' /rails/activerecord/lib/active_record/querying.rb:50:in `block (2 levels) in find_by_sql' /rails/activerecord/lib/active_record/result.rb:51:in `block in each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/querying.rb:50:in `map' /rails/activerecord/lib/active_record/querying.rb:50:in `block in find_by_sql' /rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument' /rails/activerecord/lib/active_record/querying.rb:49:in `find_by_sql' /rails/activerecord/lib/active_record/statement_cache.rb:107:in `execute' /rails/activerecord/lib/active_record/core.rb:192:in `find_by' /rails/activerecord/lib/active_record/dynamic_matchers.rb:65:in `find_by_type_and_user_id' /rails/activerecord/lib/active_record/dynamic_matchers.rb:19:in `method_missing' app/models/user.rb:3:in `ensure_permission' app/models/post.rb:5:in `ensure_author' /rails/activesupport/lib/active_support/callbacks.rb:428:in `block in make_lambda' /rails/activesupport/lib/active_support/callbacks.rb:164:in `call' /rails/activesupport/lib/active_support/callbacks.rb:164:in `block (2 levels) in halting' /rails/activesupport/lib/active_support/callbacks.rb:599:in `call' /rails/activesupport/lib/active_support/callbacks.rb:599:in `block (2 levels) in default_terminator' /rails/activesupport/lib/active_support/callbacks.rb:598:in `catch' /rails/activesupport/lib/active_support/callbacks.rb:598:in `block in default_terminator' /rails/activesupport/lib/active_support/callbacks.rb:165:in `call' /rails/activesupport/lib/active_support/callbacks.rb:165:in `block in halting' /rails/activesupport/lib/active_support/callbacks.rb:500:in `call' /rails/activesupport/lib/active_support/callbacks.rb:500:in `block in call' /rails/activesupport/lib/active_support/callbacks.rb:500:in `each' /rails/activesupport/lib/active_support/callbacks.rb:500:in `call' /rails/activesupport/lib/active_support/callbacks.rb:90:in `run_callbacks' /rails/activerecord/lib/active_record/callbacks.rb:301:in `create_or_update' /rails/activerecord/lib/active_record/persistence.rb:151:in `save!' /rails/activerecord/lib/active_record/validations.rb:43:in `save!' /rails/activerecord/lib/active_record/attribute_methods/dirty.rb:29:in `save!' /rails/activerecord/lib/active_record/transactions.rb:303:in `block in save!' /rails/activerecord/lib/active_record/transactions.rb:374:in `block in with_transaction_returning_status' /rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `block in transaction' /rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb:183:in `within_new_transaction' /rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction' /rails/activerecord/lib/active_record/transactions.rb:210:in `transaction' /rails/activerecord/lib/active_record/transactions.rb:371:in `with_transaction_returning_status' /rails/activerecord/lib/active_record/transactions.rb:303:in `save!' /rails/activerecord/lib/active_record/suppressor.rb:42:in `save!' app/controllers/posts_controller.rb:30:in `block in create' /rails/actionpack/lib/action_controller/metal/mime_responds.rb:190:in `respond_to' app/controllers/posts_controller.rb:29:in `create' /rails/actionpack/lib/action_controller/metal/implicit_render.rb:4:in `send_action' /rails/actionpack/lib/abstract_controller/base.rb:189:in `process_action' /rails/actionpack/lib/action_controller/metal/rendering.rb:21:in `process_action' /rails/actionpack/lib/abstract_controller/callbacks.rb:20:in `block in process_action' /rails/activesupport/lib/active_support/callbacks.rb:117:in `call' /rails/activesupport/lib/active_support/callbacks.rb:117:in `call' /rails/activesupport/lib/active_support/callbacks.rb:558:in `block (2 levels) in compile' /rails/activesupport/lib/active_support/callbacks.rb:501:in `call' /rails/activesupport/lib/active_support/callbacks.rb:501:in `call' /rails/activesupport/lib/active_support/callbacks.rb:90:in `run_callbacks' /rails/actionpack/lib/abstract_controller/callbacks.rb:19:in `process_action' /rails/actionpack/lib/action_controller/metal/rescue.rb:29:in `process_action' /rails/actionpack/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action' /rails/activesupport/lib/active_support/notifications.rb:164:in `block in instrument' /rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument' /rails/activesupport/lib/active_support/notifications.rb:164:in `instrument' /rails/actionpack/lib/action_controller/metal/instrumentation.rb:30:in `process_action' /rails/actionpack/lib/action_controller/metal/params_wrapper.rb:249:in `process_action' /rails/activerecord/lib/active_record/railties/controller_runtime.rb:18:in `process_action' /rails/actionpack/lib/abstract_controller/base.rb:128:in `process' /rails/actionview/lib/action_view/rendering.rb:30:in `process' /rails/actionpack/lib/action_controller/metal.rb:194:in `dispatch' /rails/actionpack/lib/action_controller/metal.rb:241:in `block in action' /rails/actionpack/lib/action_dispatch/routing/route_set.rb:73:in `call' /rails/actionpack/lib/action_dispatch/routing/route_set.rb:73:in `dispatch' /rails/actionpack/lib/action_dispatch/routing/route_set.rb:42:in `serve' /rails/actionpack/lib/action_dispatch/journey/router.rb:43:in `block in serve' /rails/actionpack/lib/action_dispatch/journey/router.rb:30:in `each' /rails/actionpack/lib/action_dispatch/journey/router.rb:30:in `serve' /rails/actionpack/lib/action_dispatch/routing/route_set.rb:769:in `call' rack (1.6.0) lib/rack/etag.rb:24:in `call' rack (1.6.0) lib/rack/conditionalget.rb:38:in `call' rack (1.6.0) lib/rack/head.rb:13:in `call' /rails/actionpack/lib/action_dispatch/middleware/params_parser.rb:27:in `call' /rails/actionpack/lib/action_dispatch/middleware/flash.rb:266:in `call' rack (1.6.0) lib/rack/session/abstract/id.rb:225:in `context' rack (1.6.0) lib/rack/session/abstract/id.rb:220:in `call' /rails/actionpack/lib/action_dispatch/middleware/cookies.rb:560:in `call' /rails/activerecord/lib/active_record/query_cache.rb:36:in `call' /rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:642:in `call' /rails/activerecord/lib/active_record/migration.rb:378:in `call' /rails/actionpack/lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' /rails/activesupport/lib/active_support/callbacks.rb:86:in `run_callbacks' /rails/actionpack/lib/action_dispatch/middleware/callbacks.rb:27:in `call' /rails/actionpack/lib/action_dispatch/middleware/reloader.rb:73:in `call' /rails/actionpack/lib/action_dispatch/middleware/remote_ip.rb:78:in `call' /rails/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb:47:in `call' /Users/godfrey/.rvm/gems/ruby-2.2.2/bundler/gems/web-console-f5255e303d66/lib/web_console/middleware.rb:37:in `call' /rails/actionpack/lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' /rails/railties/lib/rails/rack/logger.rb:38:in `call_app' /rails/railties/lib/rails/rack/logger.rb:20:in `block in call' /rails/activesupport/lib/active_support/tagged_logging.rb:70:in `block in tagged' /rails/activesupport/lib/active_support/tagged_logging.rb:26:in `tagged' /rails/activesupport/lib/active_support/tagged_logging.rb:70:in `tagged' /rails/railties/lib/rails/rack/logger.rb:20:in `call' /rails/actionpack/lib/action_dispatch/middleware/request_id.rb:25:in `call' rack (1.6.0) lib/rack/methodoverride.rb:22:in `call' rack (1.6.0) lib/rack/runtime.rb:18:in `call' /rails/activesupport/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' rack (1.6.0) lib/rack/lock.rb:17:in `call' /rails/actionpack/lib/action_dispatch/middleware/static.rb:115:in `call' rack (1.6.0) lib/rack/sendfile.rb:113:in `call' /rails/railties/lib/rails/engine.rb:518:in `call' /rails/railties/lib/rails/application.rb:165:in `call' rack (1.6.0) lib/rack/lock.rb:17:in `call' rack (1.6.0) lib/rack/content_length.rb:15:in `call' rack (1.6.0) lib/rack/handler/webrick.rb:89:in `service' /Users/godfrey/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service' /Users/godfrey/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run' /Users/godfrey/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'
  63. ActiveRecord::SubclassNotFound (The single-table inheritance...): /rails/activerecord/lib/active_record/inheritance.rb:176:in `rescue in find_sti_class' /rails/activerecord/lib/active_record/inheritance.rb:170:in `find_sti_class'

    /rails/activerecord/lib/active_record/inheritance.rb:159:in `discriminate_class_for_record' /rails/activerecord/lib/active_record/persistence.rb:67:in `instantiate' /rails/activerecord/lib/active_record/querying.rb:50:in `block (2 levels) in find_by_sql' /rails/activerecord/lib/active_record/result.rb:51:in `block in each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/querying.rb:50:in `map' /rails/activerecord/lib/active_record/querying.rb:50:in `block in find_by_sql' /rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument' /rails/activerecord/lib/active_record/querying.rb:49:in `find_by_sql' /rails/activerecord/lib/active_record/statement_cache.rb:107:in `execute' /rails/activerecord/lib/active_record/core.rb:192:in `find_by' /rails/activerecord/lib/active_record/dynamic_matchers.rb:65:in `find_by_type_and_user_id' /rails/activerecord/lib/active_record/dynamic_matchers.rb:19:in `method_missing' app/models/user.rb:3:in `ensure_permission' app/models/post.rb:5:in `ensure_author' /rails/activesupport/lib/active_support/callbacks.rb:428:in `block in make_lambda' /rails/activesupport/lib/active_support/callbacks.rb:164:in `call' /rails/activesupport/lib/active_support/callbacks.rb:164:in `block (2 levels) in halting' /rails/activesupport/lib/active_support/callbacks.rb:599:in `call' /rails/activesupport/lib/active_support/callbacks.rb:599:in `block (2 levels) in default_terminator' /rails/activesupport/lib/active_support/callbacks.rb:598:in `catch' /rails/activesupport/lib/active_support/callbacks.rb:598:in `block in default_terminator' /rails/activesupport/lib/active_support/callbacks.rb:165:in `call' /rails/activesupport/lib/active_support/callbacks.rb:165:in `block in halting' /rails/activesupport/lib/active_support/callbacks.rb:500:in `call' /rails/activesupport/lib/active_support/callbacks.rb:500:in `block in call' /rails/activesupport/lib/active_support/callbacks.rb:500:in `each' /rails/activesupport/lib/active_support/callbacks.rb:500:in `call' /rails/activesupport/lib/active_support/callbacks.rb:90:in `run_callbacks' /rails/activerecord/lib/active_record/callbacks.rb:301:in `create_or_update' /rails/activerecord/lib/active_record/persistence.rb:151:in `save!' /rails/activerecord/lib/active_record/validations.rb:43:in `save!' /rails/activerecord/lib/active_record/attribute_methods/dirty.rb:29:in `save!' /rails/activerecord/lib/active_record/transactions.rb:303:in `block in save!' /rails/activerecord/lib/active_record/transactions.rb:374:in `block in with_transaction_returning_status' /rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `block in transaction' /rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb:183:in `within_new_transaction' /rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction' /rails/activerecord/lib/active_record/transactions.rb:210:in `transaction' /rails/activerecord/lib/active_record/transactions.rb:371:in `with_transaction_returning_status' /rails/activerecord/lib/active_record/transactions.rb:303:in `save!' /rails/activerecord/lib/active_record/suppressor.rb:42:in `save!' app/controllers/posts_controller.rb:30:in `block in create' /rails/actionpack/lib/action_controller/metal/mime_responds.rb:190:in `respond_to' app/controllers/posts_controller.rb:29:in `create' /rails/actionpack/lib/action_controller/metal/implicit_render.rb:4:in `send_action' /rails/actionpack/lib/abstract_controller/base.rb:189:in `process_action' /rails/actionpack/lib/action_controller/metal/rendering.rb:21:in `process_action' /rails/actionpack/lib/abstract_controller/callbacks.rb:20:in `block in process_action' /rails/activesupport/lib/active_support/callbacks.rb:117:in `call' /rails/activesupport/lib/active_support/callbacks.rb:117:in `call' /rails/activesupport/lib/active_support/callbacks.rb:558:in `block (2 levels) in compile' /rails/activesupport/lib/active_support/callbacks.rb:501:in `call' /rails/activesupport/lib/active_support/callbacks.rb:501:in `call' /rails/activesupport/lib/active_support/callbacks.rb:90:in `run_callbacks' /rails/actionpack/lib/abstract_controller/callbacks.rb:19:in `process_action' /rails/actionpack/lib/action_controller/metal/rescue.rb:29:in `process_action' /rails/actionpack/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action' /rails/activesupport/lib/active_support/notifications.rb:164:in `block in instrument' /rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument' /rails/activesupport/lib/active_support/notifications.rb:164:in `instrument' /rails/actionpack/lib/action_controller/metal/instrumentation.rb:30:in `process_action' /rails/actionpack/lib/action_controller/metal/params_wrapper.rb:249:in `process_action' /rails/activerecord/lib/active_record/railties/controller_runtime.rb:18:in `process_action' /rails/actionpack/lib/abstract_controller/base.rb:128:in `process' /rails/actionview/lib/action_view/rendering.rb:30:in `process' /rails/actionpack/lib/action_controller/metal.rb:194:in `dispatch' /rails/actionpack/lib/action_controller/metal.rb:241:in `block in action' /rails/actionpack/lib/action_dispatch/routing/route_set.rb:73:in `call' /rails/actionpack/lib/action_dispatch/routing/route_set.rb:73:in `dispatch' /rails/actionpack/lib/action_dispatch/routing/route_set.rb:42:in `serve' /rails/actionpack/lib/action_dispatch/journey/router.rb:43:in `block in serve' /rails/actionpack/lib/action_dispatch/journey/router.rb:30:in `each' /rails/actionpack/lib/action_dispatch/journey/router.rb:30:in `serve' /rails/actionpack/lib/action_dispatch/routing/route_set.rb:769:in `call' rack (1.6.0) lib/rack/etag.rb:24:in `call' rack (1.6.0) lib/rack/conditionalget.rb:38:in `call' rack (1.6.0) lib/rack/head.rb:13:in `call' /rails/actionpack/lib/action_dispatch/middleware/params_parser.rb:27:in `call' /rails/actionpack/lib/action_dispatch/middleware/flash.rb:266:in `call' rack (1.6.0) lib/rack/session/abstract/id.rb:225:in `context' rack (1.6.0) lib/rack/session/abstract/id.rb:220:in `call' /rails/actionpack/lib/action_dispatch/middleware/cookies.rb:560:in `call' /rails/activerecord/lib/active_record/query_cache.rb:36:in `call' /rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:642:in `call' /rails/activerecord/lib/active_record/migration.rb:378:in `call' /rails/actionpack/lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' /rails/activesupport/lib/active_support/callbacks.rb:86:in `run_callbacks' /rails/actionpack/lib/action_dispatch/middleware/callbacks.rb:27:in `call' /rails/actionpack/lib/action_dispatch/middleware/reloader.rb:73:in `call' /rails/actionpack/lib/action_dispatch/middleware/remote_ip.rb:78:in `call' /rails/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb:47:in `call' /Users/godfrey/.rvm/gems/ruby-2.2.2/bundler/gems/web-console-f5255e303d66/lib/web_console/middleware.rb:37:in `call' /rails/actionpack/lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' /rails/railties/lib/rails/rack/logger.rb:38:in `call_app' /rails/railties/lib/rails/rack/logger.rb:20:in `block in call' /rails/activesupport/lib/active_support/tagged_logging.rb:70:in `block in tagged' /rails/activesupport/lib/active_support/tagged_logging.rb:26:in `tagged' /rails/activesupport/lib/active_support/tagged_logging.rb:70:in `tagged' /rails/railties/lib/rails/rack/logger.rb:20:in `call' /rails/actionpack/lib/action_dispatch/middleware/request_id.rb:25:in `call' rack (1.6.0) lib/rack/methodoverride.rb:22:in `call' rack (1.6.0) lib/rack/runtime.rb:18:in `call' /rails/activesupport/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' rack (1.6.0) lib/rack/lock.rb:17:in `call' /rails/actionpack/lib/action_dispatch/middleware/static.rb:115:in `call' rack (1.6.0) lib/rack/sendfile.rb:113:in `call' /rails/railties/lib/rails/engine.rb:518:in `call' /rails/railties/lib/rails/application.rb:165:in `call' rack (1.6.0) lib/rack/lock.rb:17:in `call' rack (1.6.0) lib/rack/content_length.rb:15:in `call' rack (1.6.0) lib/rack/handler/webrick.rb:89:in `service' /Users/godfrey/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service' /Users/godfrey/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run' /Users/godfrey/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread' /rails/activerecord/lib/active_record/querying.rb:49:in `find_by_sql' /rails/activerecord/lib/active_record/statement_cache.rb:107:in `execute' /rails/activerecord/lib/active_record/core.rb:192:in `find_by' /rails/activerecord/lib/active_record/dynamic_matchers.rb:65:in `find_by_type_and_user_id' /rails/activerecord/lib/active_record/dynamic_matchers.rb:19:in `method_missing' app/models/user.rb:3:in `ensure_permission' app/models/post.rb:5:in `ensure_author' /rails/activesupport/lib/active_support/callbacks.rb:428:in `block in make_lambda' /rails/activesupport/lib/active_support/callbacks.rb:164:in `call' /rails/activesupport/lib/active_support/callbacks.rb:164:in `block (2 levels) in halting' /rails/activesupport/lib/active_support/callbacks.rb:599:in `call' /rails/activesupport/lib/active_support/callbacks.rb:599:in `block (2 levels) in default_terminator' /rails/activesupport/lib/active_support/callbacks.rb:598:in `catch' /rails/activesupport/lib/active_support/callbacks.rb:598:in `block in default_terminator' /rails/activesupport/lib/active_support/callbacks.rb:165:in `call' /rails/activesupport/lib/active_support/callbacks.rb:165:in `block in halting' /rails/activesupport/lib/active_support/callbacks.rb:500:in `call' /rails/activesupport/lib/active_support/callbacks.rb:500:in `block in call' /rails/activesupport/lib/active_support/callbacks.rb:500:in `each' /rails/activesupport/lib/active_support/callbacks.rb:500:in `call' /rails/activesupport/lib/active_support/callbacks.rb:90:in `run_callbacks' /rails/activerecord/lib/active_record/callbacks.rb:301:in `create_or_update' /rails/activerecord/lib/active_record/persistence.rb:151:in `save!' /rails/activerecord/lib/active_record/validations.rb:43:in `save!' /rails/activerecord/lib/active_record/attribute_methods/dirty.rb:29:in `save!' /rails/activerecord/lib/active_record/transactions.rb:303:in `block in save!' /rails/activerecord/lib/active_record/transactions.rb:374:in `block in with_transaction_returning_status' /rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `block in transaction' /rails/activerecord/lib/active_record/connection_adapters/abstract/transaction.rb:183:in `within_new_transaction' /rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction' /rails/activerecord/lib/active_record/transactions.rb:210:in `transaction' /rails/activerecord/lib/active_record/transactions.rb:371:in `with_transaction_returning_status' /rails/activerecord/lib/active_record/transactions.rb:303:in `save!' /rails/activerecord/lib/active_record/suppressor.rb:42:in `save!' app/controllers/posts_controller.rb:30:in `block in create' /rails/actionpack/lib/action_controller/metal/mime_responds.rb:190:in `respond_to' app/controllers/posts_controller.rb:29:in `create' /rails/actionpack/lib/action_controller/metal/implicit_render.rb:4:in `send_action' /rails/actionpack/lib/abstract_controller/base.rb:189:in `process_action' /rails/actionpack/lib/action_controller/metal/rendering.rb:21:in `process_action'
  64. raise “zomg”

  65. class User < ActiveRecord::Base has_many :permissions has_many :posts def ensure_permission(role)

    raise "lolwut, how did I get here??" permissions.find_by_type!(role) end end
  66. None
  67. None
  68. None
  69. @current_user.name

  70. nil.name

  71. @current_user = User.find_by_id(session[:user_id])

  72. puts “zomg”

  73. class ApplicationController < ActionController::Base def current_user require "pp" puts "ZOMG

    " * 1000 puts puts "Stack Trace:" puts caller puts puts "User ID: #{ session[:user_id].inspect }" puts puts "User:" pp User.find_by_id(session[:user_id]) puts puts "LOL " * 1000 @current_user ||= User.find_by_id(session[:user_id]) end end
  74. puts caller

  75. require ‘pp’ pp some_object

  76. pp instance_values

  77. Debugger

  78. group :development, :test do # Call 'byebug' anywhere in the

    code to stop execution # and get a debugger console gem 'byebug' # Access an IRB console on exception pages or by using # <%= console %> in views gem 'web-console' ... end Gemfile
  79. class ApplicationController < ActionController::Base def current_user byebug @current_user ||= User.find_by_id(session[:user_id])

    end end
  80. Started GET "/posts/1" for ::1 at 2015-04-20 14:22:58 -0400 Processing

    by PostsController#show as HTML Parameters: {"id"=>"1"} [1, 9] in /private/tmp/demo/app/controllers/application_controller.rb 1: class ApplicationController < ActionController::Base 2: 3: def current_user 4: byebug 5: => 6: @current_user ||= User.find_by_id(session[:user_id]) 7: end 8: 9: end (byebug)
  81. { next, up, down, continue, ... }

  82. <%= console %>

  83. ActiveRecord::SubclassNotFound (The single-table inheritance...): /rails/activerecord/lib/active_record/inheritance.rb:176:in `rescue in find_sti_class' /rails/activerecord/lib/active_record/inheritance.rb:170:in `find_sti_class'

    /rails/activerecord/lib/active_record/inheritance.rb:159:in `discriminate_class_for_record' /rails/activerecord/lib/active_record/persistence.rb:67:in `instantiate' /rails/activerecord/lib/active_record/querying.rb:50:in `block (2 levels) in find_by_sql' /rails/activerecord/lib/active_record/result.rb:51:in `block in each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/querying.rb:50:in `map' /rails/activerecord/lib/active_record/querying.rb:50:in `block in find_by_sql' /rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument' /rails/activerecord/lib/active_record/querying.rb:49:in `find_by_sql' /rails/activerecord/lib/active_record/statement_cache.rb:107:in `execute'
  84. ActiveRecord::SubclassNotFound (The single-table inheritance...): /rails/activerecord/lib/active_record/inheritance.rb:176:in `rescue in find_sti_class' /rails/activerecord/lib/active_record/inheritance.rb:170:in `find_sti_class'

    /rails/activerecord/lib/active_record/inheritance.rb:159:in `discriminate_class_for_record' /rails/activerecord/lib/active_record/persistence.rb:67:in `instantiate' /rails/activerecord/lib/active_record/querying.rb:50:in `block (2 levels) in find_by_sql' /rails/activerecord/lib/active_record/result.rb:51:in `block in each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/querying.rb:50:in `map' /rails/activerecord/lib/active_record/querying.rb:50:in `block in find_by_sql' /rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument' /rails/activerecord/lib/active_record/querying.rb:49:in `find_by_sql' /rails/activerecord/lib/active_record/statement_cache.rb:107:in `execute'
  85. bundle open GEM_NAME

  86. gem pristine GEM_NAME

  87. Restart Rails server!

  88. spring stop

  89. export DISABLE_SPRING=1

  90. bundle open rails

  91. None
  92. ActiveRecord::SubclassNotFound (The single-table inheritance...): /rails/activerecord/lib/active_record/inheritance.rb:176:in `rescue in find_sti_class' /rails/activerecord/lib/active_record/inheritance.rb:170:in `find_sti_class'

    /rails/activerecord/lib/active_record/inheritance.rb:159:in `discriminate_class_for_record' /rails/activerecord/lib/active_record/persistence.rb:67:in `instantiate' /rails/activerecord/lib/active_record/querying.rb:50:in `block (2 levels) in find_by_sql' /rails/activerecord/lib/active_record/result.rb:51:in `block in each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/result.rb:51:in `each' /rails/activerecord/lib/active_record/querying.rb:50:in `map' /rails/activerecord/lib/active_record/querying.rb:50:in `block in find_by_sql' /rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument' /rails/activerecord/lib/active_record/querying.rb:49:in `find_by_sql' /rails/activerecord/lib/active_record/statement_cache.rb:107:in `execute'
  93. bundle open activerecord

  94. gem “rails”, path: “~/oss-forks/rails/”

  95. git stash ... git reset ...

  96. git checkout master git checkout 4-2-stable git checkout v4.2.1

  97. require 'active_support/core_ext/hash/indifferent_access' module ActiveRecord # == Single table inheritance #

    # Active Record allows inheritance by storing the name of the class in a column that by # default is named "type" (can be changed by overwriting <tt>Base.inheritance_column</tt>). # This means that an inheritance looking like this: # # class Company < ActiveRecord::Base; end # class Firm < Company; end # class Client < Company; end # class PriorityClient < Client; end # # When you do <tt>Firm.create(name: "37signals")</tt>, this record will be saved in # the companies table with type = "Firm". You can then fetch this row again using # <tt>Company.where(name: '37signals').first</tt> and it will return a Firm object. # # Be aware that because the type column is an attribute on the record every new # subclass will instantly be marked as dirty and the type column will be included # in the list of changed attributes on the record. This is different from non # STI classes: # # Company.new.changed? # => false # Firm.new.changed? # => true # Firm.new.changes # => {"type"=>["","Firm"]} # # If you don't have a type column defined in your table, single-table inheritance won't # be triggered. In that case, it'll work just like normal subclasses with no special magic # for differentiating between them or reloading the right type with find. # # Note, all the attributes for all the cases are kept in the same table. Read more: # http://www.martinfowler.com/eaaCatalog/singleTableInheritance.html # module Inheritance extend ActiveSupport::Concern included do # Determines whether to store the full constant name including namespace when using STI. class_attribute :store_full_sti_class, instance_writer: false self.store_full_sti_class = true end module ClassMethods # Determines if one of the attributes passed in is the inheritance column, # and if the inheritance column is attr accessible, it initializes an # instance of the given subclass instead of the base class. def new(*args, &block) if abstract_class? || self == Base raise NotImplementedError, "#{self} is an abstract class and cannot be instantiated." end attrs = args.first if subclass_from_attributes?(attrs) subclass = subclass_from_attributes(attrs) end if subclass subclass.new(*args, &block) else super end end # Returns +true+ if this does not need STI type condition. Returns # +false+ if STI type condition needs to be applied. def descends_from_active_record? if self == Base false elsif superclass.abstract_class? superclass.descends_from_active_record? else superclass == Base || !columns_hash.include?(inheritance_column) end end def finder_needs_type_condition? #:nodoc: # This is like this because benchmarking justifies the strange :false stuff :true == (@finder_needs_type_condition ||= descends_from_active_record? ? :false : :true) end # Returns the class descending directly from ActiveRecord::Base, or # an abstract class, if any, in the inheritance hierarchy. # # If A extends AR::Base, A.base_class will return A. If B descends from A # through some arbitrarily deep hierarchy, B.base_class will return A. # # If B < A and C < B and if A is an abstract_class then both B.base_class # and C.base_class would return B as the answer since A is an abstract_class. def base_class unless self < Base raise ActiveRecordError, "#{name} doesn't belong in a hierarchy descending from ActiveRecord" end if superclass == Base || superclass.abstract_class? self else superclass.base_class end end # Set this to true if this is an abstract class (see <tt>abstract_class?</tt>). # If you are using inheritance with ActiveRecord and don't want child classes # to utilize the implied STI table name of the parent class, this will need to be true. # For example, given the following: # # class SuperClass < ActiveRecord::Base # self.abstract_class = true # end # class Child < SuperClass # self.table_name = 'the_table_i_really_want' # end # # # <tt>self.abstract_class = true</tt> is required to make <tt>Child<.find,.create, or any Arel method></tt> use <tt>the_table_i_really_want</tt> instead of a table called <tt>super_classes</tt> # attr_accessor :abstract_class # Returns whether this class is an abstract class or not. def abstract_class? defined?(@abstract_class) && @abstract_class == true end def sti_name store_full_sti_class ? name : name.demodulize end protected # Returns the class type of the record using the current module as a prefix. So descendants of # MyApp::Business::Account would appear as MyApp::Business::AccountSubclass. def compute_type(type_name) if type_name.match(/^::/) # If the type is prefixed with a scope operator then we assume that # the type_name is an absolute reference. ActiveSupport::Dependencies.constantize(type_name) else # Build a list of candidates to search for candidates = [] name.scan(/::|$/) { candidates.unshift "#{$`}::#{type_name}" } candidates << type_name candidates.each do |candidate| constant = ActiveSupport::Dependencies.safe_constantize(candidate) return constant if candidate == constant.to_s end raise NameError.new("uninitialized constant #{candidates.first}", candidates.first) end end private # Called by +instantiate+ to decide which class to use for a new # record instance. For single-table inheritance, we check the record # for a +type+ column and return the corresponding class. def discriminate_class_for_record(record) if using_single_table_inheritance?(record) find_sti_class(record[inheritance_column]) else super end end def using_single_table_inheritance?(record) record[inheritance_column].present? && columns_hash.include?(inheritance_column) end def find_sti_class(type_name) if store_full_sti_class ActiveSupport::Dependencies.constantize(type_name) else compute_type(type_name) end rescue NameError raise SubclassNotFound, "The single-table inheritance mechanism failed to locate the subclass: '#{type_name}'. " + "This error is raised because the column '#{inheritance_column}' is reserved for storing the class in case of inheritance. " + "Please rename this column if you didn't intend it to be used for storing the inheritance class " + "or overwrite #{name}.inheritance_column to use another column for that information." end def type_condition(table = arel_table) sti_column = table[inheritance_column] sti_names = ([self] + descendants).map(&:sti_name) sti_column.in(sti_names) end # Detect the subclass from the inheritance column of attrs. If the inheritance column value # is not self or a valid subclass, raises ActiveRecord::SubclassNotFound # If this is a StrongParameters hash, and access to inheritance_column is not permitted, # this will ignore the inheritance column and return nil def subclass_from_attributes?(attrs) attribute_names.include?(inheritance_column) && attrs.is_a?(Hash) end def subclass_from_attributes(attrs) subclass_name = attrs.with_indifferent_access[inheritance_column] if subclass_name.present? && subclass_name != self.name subclass = subclass_name.safe_constantize unless descendants.include?(subclass) raise ActiveRecord::SubclassNotFound.new("Invalid single-table inheritance type: #{subclass_name} is not a subclass of #{name}") end subclass end end end def initialize_dup(other) super ensure_proper_type end private def initialize_internals_callback super ensure_proper_type end # Sets the attribute used for single table inheritance to this class name if this is not the # ActiveRecord::Base descendant. # Considering the hierarchy Reply < Message < ActiveRecord::Base, this makes it possible to # do Reply.new without having to set <tt>Reply[Reply.inheritance_column] = "Reply"</tt> yourself. # No such attribute would be set for objects of the Message class in that example. def ensure_proper_type klass = self.class if klass.finder_needs_type_condition? write_attribute(klass.inheritance_column, klass.sti_name) end end end end
  98. Take a deep breath.

  99. Stay laser-focused.

  100. Ignore everything else.

  101. 1. What does this method do?

  102. 1. What does this method do? 2. What are the

    inputs?
  103. 1. What does this method do? 2. What are the

    inputs? 3. What is expected to happen?
  104. 1. What does this method do? 2. What are the

    inputs? 3. What is expected to happen? 4. Did that happen?
  105. Follow the breadcrumbs.

  106. module ActiveRecord module Inheritance module ClassMethods def find_sti_class(type_name) if store_full_sti_class

    ActiveSupport::Dependencies.constantize(type_name) else compute_type(type_name) end rescue NameError raise SubclassNotFound, "The single-table inheritance mechanism..." end end end end
  107. module ActiveRecord module Inheritance module ClassMethods def find_sti_class(type_name) if store_full_sti_class

    ActiveSupport::Dependencies.constantize(type_name) else compute_type(type_name) end rescue NameError raise SubclassNotFound, "The single-table inheritance mechanism..." end end end end
  108. module ActiveRecord module Inheritance module ClassMethods def find_sti_class(type_name) if store_full_sti_class

    ActiveSupport::Dependencies.constantize(type_name) else compute_type(type_name) end rescue NameError raise SubclassNotFound, "The single-table inheritance mechanism..." end end end end
  109. module ActiveRecord module Inheritance module ClassMethods def find_sti_class(type_name) if store_full_sti_class

    ActiveSupport::Dependencies.constantize(type_name) else compute_type(type_name) end rescue NameError raise SubclassNotFound, "The single-table inheritance mechanism..." end end end end
  110. module ActiveRecord module Inheritance module ClassMethods def find_sti_class(type_name) if store_full_sti_class

    ActiveSupport::Dependencies.constantize(type_name) else compute_type(type_name) end rescue NameError raise SubclassNotFound, "The single-table inheritance mechanism..." end end end end
  111. module ActiveRecord module Inheritance module ClassMethods def find_sti_class(type_name) if store_full_sti_class

    ActiveSupport::Dependencies.constantize(type_name) else compute_type(type_name) end rescue NameError raise SubclassNotFound, "The single-table inheritance mechanism..." end end end end Where is this defined?
  112. { Terminal, Editor, Github } Search

  113. module ActiveRecord module Inheritance module ClassMethods def find_sti_class(type_name) if store_full_sti_class

    ActiveSupport::Dependencies.constantize(type_name) else byebug compute_type(type_name) end rescue NameError raise SubclassNotFound, "The single-table inheritance mechanism..." end end end end
  114. method(:compute_type)

  115. method(:compute_type).source_location

  116. method(:compute_type).owner

  117. gem “method_source”

  118. method(:compute_type).source

  119. method(:compute_type).comment

  120. # Returns the class type of the record using the

    current module as a prefix. So descendants of # MyApp::Business::Account would appear as MyApp::Business::AccountSubclass. def compute_type(type_name) if type_name.match(/^::/) # If the type is prefixed with a scope operator then we assume that # the type_name is an absolute reference. ActiveSupport::Dependencies.constantize(type_name) else # Build a list of candidates to search for candidates = [] name.scan(/::|$/) { candidates.unshift "#{$`}::#{type_name}" } candidates << type_name candidates.each do |candidate| constant = ActiveSupport::Dependencies.safe_constantize(candidate) return constant if candidate == constant.to_s end raise NameError.new("uninitialized constant #{candidates.first}", candidates.first) end end
  121. # Returns the class type of the record using the

    current module as a prefix. So descendants of # MyApp::Business::Account would appear as MyApp::Business::AccountSubclass. def compute_type(type_name) if type_name.match(/^::/) # If the type is prefixed with a scope operator then we assume that # the type_name is an absolute reference. ActiveSupport::Dependencies.constantize(type_name) else # Build a list of candidates to search for candidates = [] name.scan(/::|$/) { candidates.unshift "#{$`}::#{type_name}" } candidates << type_name candidates.each do |candidate| constant = ActiveSupport::Dependencies.safe_constantize(candidate) return constant if candidate == constant.to_s end raise NameError.new("uninitialized constant #{candidates.first}", candidates.first) end end
  122. # Returns the class type of the record using the

    current module as a prefix. So descendants of # MyApp::Business::Account would appear as MyApp::Business::AccountSubclass. def compute_type(type_name) if type_name.match(/^::/) # If the type is prefixed with a scope operator then we assume that # the type_name is an absolute reference. ActiveSupport::Dependencies.constantize(type_name) else # Build a list of candidates to search for candidates = [] name.scan(/::|$/) { candidates.unshift "#{$`}::#{type_name}" } candidates << type_name candidates.each do |candidate| constant = ActiveSupport::Dependencies.safe_constantize(candidate) return constant if candidate == constant.to_s end raise NameError.new("uninitialized constant #{candidates.first}", candidates.first) end end
  123. git log inheritance.rb

  124. git blame inheritance.rb

  125. ceb33f84 (Jon Leighton # MyApp::Business::Account would appear as MyApp::Business::AccountSubclass. ceb33f84

    (Jon Leighton def compute_type(type_name) ceb33f84 (Jon Leighton if type_name.match(/^::/) ceb33f84 (Jon Leighton # If the type is prefixed with a scope operator then we assume that ceb33f84 (Jon Leighton # the type_name is an absolute reference. ceb33f84 (Jon Leighton ActiveSupport::Dependencies.constantize(type_name) ceb33f84 (Jon Leighton else ceb33f84 (Jon Leighton # Build a list of candidates to search for ceb33f84 (Jon Leighton candidates = [] ceb33f84 (Jon Leighton name.scan(/::|$/) { candidates.unshift "#{$`}::#{type_name}" } ceb33f84 (Jon Leighton candidates << type_name ceb33f84 (Jon Leighton ceb33f84 (Jon Leighton candidates.each do |candidate| c965de39 (Arthur Neves constant = ActiveSupport::Dependencies.safe_constantize(candidate) c965de39 (Arthur Neves return constant if candidate == constant.to_s ceb33f84 (Jon Leighton end ceb33f84 (Jon Leighton bea44cba (Chulki Lee raise NameError.new("uninitialized constant #{candidates.first}", candidates.first) ceb33f84 (Jon Leighton end ceb33f84 (Jon Leighton end
  126. git show ceb33f84

  127. ceb33f8 Split out most of the AR::Base code into separate

    modules :cake: (Jon Leighton, 3 years, 4 months ago) diff --git a/activerecord/lib/active_record.rb b/activerecord/lib/active_record.rb index 92f3666..de73715 100644 --- a/activerecord/lib/active_record.rb +++ b/activerecord/lib/active_record.rb @@ -39,6 +39,7 @@ module ActiveRecord autoload :Aggregations autoload :Associations autoload :AttributeMethods + autoload :AttributeAssignment autoload :AutosaveAssociation autoload :Relation @@ -57,27 +58,37 @@ module ActiveRecord autoload :Base autoload :Callbacks autoload :CounterCache + autoload :DefaultScope + autoload :DynamicMatchers autoload :DynamicFinderMatch autoload :DynamicScopeMatch + autoload :Explain + autoload :IdentityMap + autoload :Inheritance + autoload :Integration
  128. git blame ceb33f84^ inheritance.rb

  129. git blame ceb33f84^ inheritance.rb

  130. lame ceb33f84^ inheritance

  131. eb33f84^ inher

  132. https://github.com/chancancode/blame_parent

  133. Isolating the problem

  134. rails new --dev zomg

  135. Bug Report Template

  136. guides/bug_report_templates/active_record_gem.rb Models, database guides/bug_report_templates/action_controller_gem.rb Controllers, routing, etc guides/bug_report_templates/generic_gem.rb Everything else

  137. Getting help

  138. ...or you can probably Just Fix It™ ;)

  139. ಠ_ಠ I want my money back.

  140. Right You already know this stuff!

  141. Rails

  142. Ruby

  143. Ruby

  144. leg•a•cy code |ˈlegəsē kōd| noun code you didn’t write (this

    morning)
  145. Community Office Hour Wednesday, during happy hour Heroku booth

  146. Breaking down the barrier Demystifying contributing to Rails Eileen M.

    Uchitelle @ eileencodes
  147. @chancancode

  148. None