método indefinido `content_type 'para nil: NilClass

Question

Extraño error en el archivo diagnostics.erb acerca de _set_controller_content_type.

Por favor ayuda.

NoMethodError in Timelines#public_timeline 

Showing /opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/templates/rescues/diagnostics.erb where line # raised: 

undefined method `content_type' for nil:NilClass 
Extracted source (around line #): 

RAILS_ROOT: /Volumes/DATA/Source/Rails/tvider 

Application Trace | Framework Trace | Full Trace 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/activesupport-2.3.5/lib/active_support/whiny_nil.rb:52:in `method_missing' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_view/base.rb:331:in `_set_controller_content_type' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_view/renderable.rb:32:in `block in render' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_view/base.rb:306:in `with_template' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_view/renderable.rb:30:in `render' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_view/template.rb:205:in `render_template' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_view/base.rb:265:in `render' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/rescue.rb:134:in `rescue_action_locally' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/rescue.rb:152:in `rescue_action_without_handler' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/rescue.rb:74:in `rescue_action' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/rescue.rb:162:in `rescue in perform_action_with_rescue' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/rescue.rb:160:in `perform_action_with_rescue' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/flash.rb:146:in `perform_action_with_flash' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/base.rb:532:in `process' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/filters.rb:606:in `process_with_filters' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/base.rb:391:in `process' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/base.rb:386:in `call' 
/opt/local/lib/ruby1.9/gems/1.9.1/gems/actionpack-2.3.5/lib/action_controller/routing/route_set.rb:437:in `call' 
Request 

Parameters: 

None 
Show session dump 

Response 

Headers: 

{"Cache-Control"=>"no-cache", 
"Content-Type"=>""} 

Answer 1

Lo acción estás tratando de llamar en el controlador?

¡compruebe el nombre de acción en el controlador!

Answer 2

No sé si esta es la causa de su error. Pero cuando recibí este error, fue porque sin pensarlo definí una acción de "respuesta" en mi controlador. Renombrado la acción, y todo estaba bien.