Comment lire la trace d'une migration échouée de Rails associée à la gemme de verrouillage

Question

Plus souvent qu'autrement, lorsque j'obtiens une erreur, la trace pointe vers une ligne dans mon propre code. Je vais aller à cette ligne, trouver l'erreur et la réparer.

Cependant, en ce moment, la trace pointe vers Rails et le code gem, et je ne sais pas comment l'utiliser pour déboguer mon travail.

J'ai suivi les étapes listées here.

Lorsque je cours rake db:migrate --trace, j'obtiens la trace ci-dessous. Je ne demande à personne de le déboguer pour moi, mais j'apprécierais tout pointeur sur ce que vous rechercheriez lors du débogage.

rake db:migrate --trace 
(in /Users/steven/Drominay) 
** Invoke db:migrate (first_time) 
** Invoke environment (first_time) 
** Execute environment 
=> Mixing in Lockdown version: 1.6.2 

rake aborted! 
uninitialized constant Lockdown::Frameworks::Rails::Environment::ApplicationController 
/Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:442:in `load_missing_constant' 
/Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:77:in `const_missing' 
/Library/Ruby/Gems/1.8/gems/lockdown-1.6.2/lib/lockdown/frameworks/rails.rb:70:in `controller_parent' 
/Library/Ruby/Gems/1.8/gems/lockdown-1.6.2/lib/lockdown/frameworks/rails.rb:29:in `mixin_controller' 
/Library/Ruby/Gems/1.8/gems/lockdown-1.6.2/lib/lockdown/frameworks/rails.rb:18:in `mixin' 
/Library/Ruby/Gems/1.8/gems/lockdown-1.6.2/lib/lockdown/frameworks/rails.rb:14:in `included' 
/Library/Ruby/Gems/1.8/gems/lockdown-1.6.2/lib/lockdown.rb:72:in `include' 
/Library/Ruby/Gems/1.8/gems/lockdown-1.6.2/lib/lockdown.rb:72:in `mixin_resource?' 
/Library/Ruby/Gems/1.8/gems/lockdown-1.6.2/lib/lockdown.rb:67:in `each' 
/Library/Ruby/Gems/1.8/gems/lockdown-1.6.2/lib/lockdown.rb:67:in `mixin_resource?' 
/Library/Ruby/Gems/1.8/gems/lockdown-1.6.2/lib/lockdown.rb:43:in `mixin' 
/Library/Ruby/Gems/1.8/gems/lockdown-1.6.2/lib/lockdown.rb:85 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' 
/Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:155:in `require' 
/Users/steven/Drominay/config/initializers/lockit.rb:1 
/Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:144:in `load_without_new_constant_marking' 
/Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:144:in `load' 
/Users/steven/.gem/ruby/1.8/gems/rails-2.2.2/lib/initializer.rb:550:in `load_application_initializers' 
/Users/steven/.gem/ruby/1.8/gems/rails-2.2.2/lib/initializer.rb:549:in `each' 
/Users/steven/.gem/ruby/1.8/gems/rails-2.2.2/lib/initializer.rb:549:in `load_application_initializers' 
/Users/steven/.gem/ruby/1.8/gems/rails-2.2.2/lib/initializer.rb:167:in `process' 
/Users/steven/.gem/ruby/1.8/gems/rails-2.2.2/lib/initializer.rb:112:in `send' 
/Users/steven/.gem/ruby/1.8/gems/rails-2.2.2/lib/initializer.rb:112:in `run' 
/Users/steven/Drominay/config/environment.rb:14 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' 
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' 
/Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:153:in `require' 
/Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:521:in `new_constants_in' 
/Library/Ruby/Gems/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:153:in `require' 
/Users/steven/.gem/ruby/1.8/gems/rails-2.2.2/lib/tasks/misc.rake:3 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain' 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run' 
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/bin/rake:31 
/usr/bin/rake:19:in `load' 
/usr/bin/rake:19 

Answer 1

fixe en changeant application.rb à application_controller.rb, selon this article.

(Toujours intéressé par l'utilisation pratique de cette trace cependant.)