undefined method `content_type' for nil:NilClass

Question

Strange error in diagnostics.erb file about _set_controller_content_type.

Please help.

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

I don't know if this is the cause of your error. But when I got this error, it was because I unthinkingly defined a "response" action in my controller. Renamed the action, and all was well.

Code Example:

class PagesController < ApplicationController

  def request
  end

  def response
  end

end

Answer 2

What action are you trying to call in the controller ?

check the action_name in the controller !