Problèmes lors de l'utilisation de haml et rails3

Question

Après l'installation de rails3, je rencontre des problèmes lorsque j'utilise haml avec.

J'ai la gem mise à jour installée, et après rails PROJECT_NAME, j'ai fait haml --rails dans sa racine.

Il a apparemment fonctionné correctement, puisque j'ai le dossier haml dans les plugins, init.rb, comme prévu.

Mais lorsque je tente de ratisser ou d'un serveur de rails, je reçois:

rake aborted! 
no such file to load -- haml 

Avec --trace je reçois ceci:

** Invoke default (first_time) 
** Invoke test (first_time) 
** Execute test 
** Invoke test:units (first_time) 
** Invoke db:test:prepare (first_time) 
** Invoke db:abort_if_pending_migrations (first_time) 
** Invoke environment (first_time) 
** Execute environment 
rake aborted! 
no such file to load -- haml 
/usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta/lib/active_support/dependencies.rb:167:in `require' 
/usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta/lib/active_support/dependencies.rb:167:in `require' 
/usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta/lib/active_support/dependencies.rb:537:in `new_constants_in' 
/usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.0.beta/lib/active_support/dependencies.rb:167:in `require' 
RAILS_PROJECT_ROOT/vendor/plugins/haml/init.rb:5 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/plugin.rb:49 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/initializable.rb:25:in `instance_exec' 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/initializable.rb:25:in `run' 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/initializable.rb:55:in `run_initializers' 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/initializable.rb:54:in `each' 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/initializable.rb:54:in `run_initializers' 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/application.rb:71:in `initialize!' 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/application.rb:112:in `initialize_tasks' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' 
/usr/local/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `each' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain' 
/usr/local/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `each' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain' 
/usr/local/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `each' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain' 
/usr/local/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/test_unit/testing.rake:45 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/test_unit/testing.rake:43:in `collect' 
/usr/local/lib/ruby/gems/1.8/gems/railties-3.0.0.beta/lib/rails/test_unit/testing.rake:43 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' 
/usr/local/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `each' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain' 
/usr/local/lib/ruby/1.8/monitor.rb:242:in `synchronize' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run' 
/usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31 
/usr/local/bin/rake:19:in `load' 
/usr/local/bin/rake:19 

Answer 1

J'ai juste besoin de mettre gem "haml" dans le Gemfile.

Answer 2

Une autre cause fréquente de ceci est que Haml est installé comme une gemme dans un environnement RVM, mais pas celui dans lequel l'application Rails est en cours d'exécution.