Code diving in Ruby and Rails

Code Diving in Ruby

Evan DornFounder, Logical Reality Design

http://[email protected]

@idahoev

Friday, August 9, 13

http://LRDesign.com

http://LRDesign.com

mailto:[email protected]




SO YOU’RE CODING ALONG WHEN...


1) InvoicesController as an admin GET index should paginate all unpaid invoices as @unpaid_invoices Failure/Error: get :index NoMethodError: undefined method ùnpayed' for #<Class:0x007fd8cfe9ee18> # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/dynamic_matchers.rb:55:in `method_missing' # ./app/controllers/invoices_controller.rb:7:in ìndex' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/actionpack-3.2.12/lib/action_controller/metal/implicit_render.rb:4:in `send_action' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/actionpack-3.2.12/lib/abstract_controller/base.rb:167:in `process_action' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/actionpack-3.2.12/lib/action_controller/metal/rendering.rb:10:in `process_action' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/actionpack-3.2.12/lib/abstract_controller/callbacks.rb:18:in `block in process_action' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:447:in `_run__3859364058582123788__process_action__4176185741589430016__callbacks' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:405:in `__run_callback' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:81:in `run_callbacks' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/actionpack-3.2.12/lib/abstract_controller/callbacks.rb:17:in `process_action' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/actionpack-3.2.12/lib/action_controller/metal/rescue.rb:29:in `process_action' # /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/actionpack-3.2.12/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'


AND YOU’RE LIKE


BUT THEN YOU NOTICE THIS...






BUT WHAT ABOUT WHEN...


/Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/core_ext/hash/keys.rb:25:in `symbolize_keys': You blew it, dumbass (RuntimeError) from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:45:in `resolve_hash_connection' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:41:in `resolve_string_connection' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:25:in `spec' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:130:in èstablish_connection' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/railtie.rb:82:in `block (2 levels) in <class:Railtie>' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/lazy_load_hooks.rb:36:in ìnstance_eval' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/lazy_load_hooks.rb:36:in èxecute_hook' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/lazy_load_hooks.rb:26:in `block in on_load' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/lazy_load_hooks.rb:25:in èach' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/lazy_load_hooks.rb:25:in òn_load' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/railtie.rb:74:in `block in <class:Railtie>' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/railties-3.2.12/lib/rails/initializable.rb:30:in ìnstance_exec' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/railties-3.2.12/lib/rails/initializable.rb:30:in `run' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/railties-3.2.12/lib/rails/initializable.rb:55:in `block in run_initializers' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/railties-3.2.12/lib/rails/initializable.rb:54:in èach' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/railties-3.2.12/lib/rails/initializable.rb:54:in `run_initializers' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/railties-3.2.12/lib/rails/application.rb:136:in ìnitialize!' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/railties-3.2.12/lib/rails/railtie/configurable.rb:30:in `method_missing' from /Volumes/Valinor/Users/evan/Development/Ruby/apps/tracks/config/environment.rb:5:in `<top (required)>' from /Volumes/Valinor/Users/evan/Development/Ruby/apps/tracks/spec/spec_helper.rb:3:in `require' from /Volumes/Valinor/Users/evan/Development/Ruby/apps/tracks/spec/spec_helper.rb:3:in `<top








IT’S PROBABLY SOMETHING YOU DID.


IT’S PROBABLY SOMETHING YOU DID.

(but the error’s not in your code)


RAILS’ CODE ISHARD TO UNDERSTAND


RAILS’ CODE ISHARD TO UNDERSTAND

But that doesn’t matter!Dive in anyway.


RUBY IS A RUN-TIME LANGUAGE



•This makes it hard to find stuff!




•Your IDE isn’t much help




•Your IDE isn’t much help

•So find stuff AT RUN TIME


JUST OPEN THAT FILE


JUST OPEN THAT FILEDon’t be intimidated ... it’s all just Ruby


JUST OPEN THAT FILE

~/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/core_ext/hash/keys.rb:25:in `symbolize_keys': You blew it, dumbass (RuntimeError) from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:45:in `resolve_hash_connection' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:41:in `resolve_string_connection' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/

Don’t be intimidated ... it’s all just Ruby


JUST OPEN THAT FILE

~/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12/lib/active_support/core_ext/hash/keys.rb:25:in `symbolize_keys': You blew it, dumbass (RuntimeError) from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:45:in `resolve_hash_connection' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:41:in `resolve_string_connection' from /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/

$ vim ~evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/activesupport-3.2.12

Don’t be intimidated ... it’s all just Ruby


USE GEM...


USE GEM...$ gem env


USE GEM...RubyGems Environment: - RUBYGEMS VERSION: 1.8.25 - RUBY VERSION: 1.9.3 (2012-11-10 patchlevel 327) [x86_64-darwin11.4.2] - INSTALLATION DIRECTORY: /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fas - RUBY EXECUTABLE: /Volumes/Valinor/Users/evan/.rvm/rubies/ruby-1.9.3-p327-fast/bin/ - EXECUTABLE DIRECTORY: /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/bin - RUBYGEMS PLATFORMS: - ruby - x86_64-darwin-11 - GEM PATHS: - /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks - /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@global - GEM CONFIGURATION:

$ gem env



$ gem env



$ gem env

$ cd /Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks


ASK RUBY YOUR QUESTIONS!


WHAT’S THIS VALUE?#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys dup.symbolize_keys! end

alias_method :to_options, :symbolize_keys alias_method :to_options!, :symbolize_keys!

# Validate all keys in a hash match *valid keys, raising ArgumentError on a mismatch. # Note that keys are NOT treated indifferently, meaning if you use strings for keys but assert symbols


WHAT’S THIS VALUE?#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys dup.symbolize_keys! end




WHAT’S THIS VALUE?#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys p self dup.symbolize_keys! end


# Validate all keys in a hash match *valid keys, raising ArgumentError on a mismatch. # Note that keys are NOT treated indifferently, meaning if you


TOO MUCH OUTPUT!.{:client_id=>"24"}{"controller"=>"invoices", "action"=>"new"}.{:client_id=>"27"}{"controller"=>"invoices", "action"=>"new"}.{:client_id=>"30"}{"controller"=>"invoices", "action"=>"new"}.{:client_id=>"33"}{"controller"=>"invoices", "action"=>"new"}.{:client_id=>"37"}{"controller"=>"invoices", "action"=>"new"}.{:id=>"19"}{"id"=>"19", "controller"=>"invoices", "action"=>"edit"}.{:id=>"20"}{"id"=>"20", "controller"=>"invoices", "action"=>"edit"}{:controller=>"devise/sessions", :action=>"new", :use_route=>"login", :only_path=>true}.{:invoice=>{:due_on=>"2013-05-14", :client_id=>"42", :notes=>"value for notes"}}


OUTPUT AND STOP#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys raise self # stop running! dup.symbolize_keys! end




ADD A CONDITION#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys raise self if <some condition> dup.symbolize_keys! end




KEEP TRACK OF LOCATION#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys p __FILE__, __LINE__ dup.symbolize_keys! end




LABEL WITH LOCATION#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys p “#{__FILE__}:#{__LINE__}” => self dup.symbolize_keys! end




TAG WITH A NAME#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys p :broken_hash => self dup.symbolize_keys! end




CLEAN IT UP#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys require ‘pp’ pp self dup.symbolize_keys! end


# Validate all keys in a hash match *valid keys, raising ArgumentError on a mismatch.


OTHER USEFULQUESTIONS


HOW DID I GET HERE?


HOW DID I GET HERE?#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys require ‘pp’ pp caller[0..10] dup.symbolize_keys! end


# Validate all keys in a hash match *valid keys, raising ArgumentError on a mismatch.


“DOES THIS FILE LOAD?”

module SomePossiblyIncludedMonkeyPatch def change_important_class_behavior # ... # ... end

def obscure_some_key_method # ... # ... end

end


“DOES THIS FILE LOAD?”raise “Yes, somebody required me”



end


“WHY DIDN’T THIS FILE LOAD?”


“WHY DIDN’T THIS FILE LOAD?”require ‘some_library/some_junk’

module MyNiftyBehavior def stuff




$ rspec spec/ No such file to load -- some_library/some_junk (LoadError)





... pretty print the search path





... pretty print the search pathrequire ‘pp’pp $:require ‘some_library/some_junk’



“WHO REQUIRED ME?”



end


“WHO REQUIRED ME?”p “Required By” => caller[0]



end


WHAT IF YOU DON’T KNOW THE RIGHT QUESTION YET?


USE DEBUGGER!


YOUR GEMFILEsource 'http://rubygems.org'

gem 'rails', '3.2.12'gem 'rack', '~> 1.4.0'

gem 'rake'gem "will_paginate"gem 'devise'

group :development, :test do gem 'rspec' gem 'rspec-rails' gem 'factory_girl_rails' gem 'debugger'end


http://rubygems.org

http://rubygems.org

IN THE CODEclass Hash # Return a new hash with all keys converted to symbols, as # long as they respond to +to_sym+. # # { 'name' => 'Rob', 'years' => '28' }.symbolize_keys # #=> { :name => "Rob", :years => "28" } def symbolize_keys debugger dup.symbolize_keys! end




RUNNING IT


RUNNING IT

$ rails server -u

Development Server:


RUNNING IT

$ rails server -u

Development Server:

$ rspec -d spec/

rSpec:


RUNNING IT

Arbitrary Ruby script:$ rdebug <command>

$ rdebug rake db:seed


WHO ARE YOU?#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash def symbolize_keys debugger dup.symbolize_keys! end


WHO ARE YOU?

(rdb:1) eval dup.class

#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash def symbolize_keys debugger dup.symbolize_keys! end


WHO ARE YOU?

(rdb:1) eval dup.class

Hash

#activesupport-3.2.12/lib/active_support/core_ext/hash class Hash def symbolize_keys debugger dup.symbolize_keys! end


WHO AM I?(rdb:1) eval self.class


WHO AM I?(rdb:1) eval self.class

Hash


WHO CAN I CALL?(rdb:1) eval self.methods


WHO CAN I CALL?(rdb:1) eval self.methods

[:specify, :class_variable_defined?, :public_class_method, :methods, :use_instantiated_fixtures=, :filtered_examples, :before_all_ivars, :should, :const_defined?, :untrust, :local_constant_names, :should_not, :capture, :module_eval, :instance_methods, :clone, :load_dependency, :to_json, :run_hook, :all_apply?, :share_examples_for, :include?, :redefine_method, :to_yaml, :respond_to?, :examples, :fail_fast?, :unloadable, :it_should_behave_like, :<=>, :instance_variable_defined?, :register, :acts_like?, :psych_yaml_as, :debug_method, :fixture_class_names, :let!, :render_views, :focus, :private_class_method, :delegate, :public_constant, :singleton_methods, :pretty_print_instance_variables, :attr_internal_writer, :use_instantiated_fixtures?, :matcher, :try, :tests, :as_json, :gem, :untrusted?, :controller_class, :pending, :parent, :silence, :class_eval,


WHO CAN I CALL?(rdb:1) eval self.methods.sort


WHO CAN I CALL?(rdb:1) eval self.methods.sort

[:!, :!=, :!~, :<=>, :==, :===, :=~, :[], :[]=, :__id__, :__send__, :`, :acts_like?, :all?, :any?, :as_json, :assert_valid_keys, :assoc, :binding_n, :blank?, :breakpoint, :capture, :chunk, :class, :class_eval, :clear, :clone, :collect, :collect_concat, :compare_by_identity, :compare_by_identity?, :count, :cycle, :dbg_print, :dbg_puts, :debugger, :deep_dup, :deep_merge, :deep_merge!, :deep_symbolize_keys, :default, :default=, :default_proc, :default_proc=, :define_singleton_method, :delete, :delete_if, :detect, :diff, :display, :drop, :drop_while, :dup, :duplicable?, :each, :each_cons, :each_entry, :each_key, :each_pair, :each_slice, :each_value, :each_with_index, :each_with_object, :empty?, :enable_warnings, :encode_json, :entries, :enum_for, :eql?, :equal?, :except, :except!, :exclude?, :extend, :extract!, :extractable_options?, :fetch, :find, :find_all, :find_index,


WHO CAN I CALL?(rdb:1) eval self.methods.grep(/merge/)


WHO CAN I CALL?(rdb:1) eval self.methods.grep(/merge/)

[:deep_merge!, :reverse_merge!, :merge!, :merge, :deep_merge, :reverse_merge, :merge_resultset]


DEBUGGER HAS ‘PP’ BY DEFAULT


WHO DO YOU INCLUDE?(rdb:1) pp dup.class.included_modules


WHO DO YOU INCLUDE?(rdb:1) pp dup.class.included_modules

[SimpleCov::HashMergeHelper, JSON::Ext::Generator::GeneratorMethods::Hash, Enumerable, RSpec::Steps::ClassMethods, JSON::Ext::Generator::GeneratorMethods::Object, ActiveSupport::Dependencies::Loadable, PP::ObjectMixin, Kernel]


FINDINGMETHODS


AT THE COMMAND-LINE

-H (show filename)

-n (show line number)

-r (recurse directories)

-i (ignore case -- use carefully)

$ grep -Hnir <pattern> <path>


USEFUL PATTERNS


USEFUL PATTERNS

$ grep -Hnr “def *my_method” *

Method definitions:


USEFUL PATTERNS

$ grep -Hnr “def *my_method” *

Method definitions:

$ grep <stuff> | grep -v “ *#”

Ignore comments:


ACK > GREP$ ack <pattern>


ACK > GREP


ACK > GREP •Looks only in programming files (ignores

logs!)



logs!)

•brew install ack



logs!)

•brew install ack

•Configurable via .ackrc



logs!)

•brew install ack

•Configurable via .ackrc

•https://gist.github.com/IdahoEv/5580770


BUT THEN THIS...


BUT THEN THIS...$ ack “def *my_method”


BUT THEN THIS...$ ack “def *my_method”$



... it doesn’t exist



... it doesn’t exist


BECAUSE RUBY LETS YOU DO THIS...


module RSpec module Core class ExampleGroup class << self

delegate_to_metadata :described_class, :file_path alias_method :display_name, :description alias_method :describes, :described_class

# @private # @macro [attach] define_example_method # @param [String] name # @param [Hash] extra_options # @param [Block] implementation def self.define_example_method(name, extra_options={}) module_eval(<<-END_RUBY, __FILE__, __LINE__) def #{name}(desc=nil, *args, &block) options = build_metadata_hash_from(args) options.update(:pending => RSpec::Core::Pending::) unless block options.update(#{extra_options.inspect}) examples << RSpec::Core::Example.new(self, desc, options, block) examples.last end END_RUBY end

define_example_method :example define_example_method :it define_example_method :specify

define_example_method :focus, :focused => true, :focus => true


module RSpec module Core class ExampleGroup class << self

delegate_to_metadata :described_class, :file_path alias_method :display_name, :description alias_method :describes, :described_class

# @private # @macro [attach] define_example_method # @param [String] name # @param [Hash] extra_options # @param [Block] implementation def self.define_example_method(name, extra_options={}) module_eval(<<-END_RUBY, __FILE__, __LINE__) def #{name}(desc=nil, *args, &block) options = build_metadata_hash_from(args) options.update(:pending => RSpec::Core::Pending::) unless block options.update(#{extra_options.inspect}) examples << RSpec::Core::Example.new(self, desc, options, block) examples.last end END_RUBY end

define_example_method :example define_example_method :it define_example_method :specify

define_example_method :focus, :focused => true, :focus => true


ADVANCED INTROSPECTION


WHO DO YOU INCLUDE?#activesupport-3.2.12/lib/active_support/core_ext/hash

class Hash # ... snip ... def symbolize_keys debugger dup.symbolize_keys! end # ... snip ...end


WHO DO YOU INCLUDE?(rdb:1) pp self.class.included_modules

[SimpleCov::HashMergeHelper, JSON::Ext::Generator::GeneratorMethods::Hash, Enumerable, RSpec::Steps::ClassMethods, JSON::Ext::Generator::GeneratorMethods::Object, ActiveSupport::Dependencies::Loadable, PP::ObjectMixin, Kernel]


WHO DEFINED THAT METHOD?(rdb:1) eval self.method(:merge_resultset).owner


WHO DEFINED THAT METHOD?(rdb:1) eval self.method(:merge_resultset).owner

SimpleCov::HashMergeHelper


BUT DEFINED WHERE?(rdb:1) pp self.method(:merge_resultset).source_location


BUT DEFINED WHERE?(rdb:1) pp self.method(:merge_resultset).source_location

["~/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/simplecov-0.5.4/lib/simplecov/merge_helpers.rb", 25]


EVEN WORKS ON DYNAMIC METHODS!



#/spec/controllers/invoices_controller_spec.rbrequire 'spec_helper'

describe InvoicesController do

debugger

describe "as an admin" do before(:each) do authenticate(:admin)



(rdb:1) eval method(:example).source_location



(rdb:1) eval method(:example).source_location

["/Volumes/Valinor/Users/evan/.rvm/gems/ruby-1.9.3-p327-fast@tracks/gems/rspec-core-2.13.1/lib/rspec/core/example_group.rb", 61]


WHERE TO LOOK NEXT•Pry (https://github.com/pry/pry)

•API Docs: http://www.ruby-doc.org/core-2.0

• Kernel

• Module

• Method


https://github.com/pry/pry

https://github.com/pry/pry

http://www.ruby-doc.org/core-2.0

http://www.ruby-doc.org/core-2.0

Thanks!

Evan DornFounder, Logical Reality Design

http://[email protected]

@idahoev

Text


http://LRDesign.com

http://LRDesign.com





Technology

Code diving in Ruby and Rails