[Alumnionrails-errors] [ALI] courses#show (ActionView::TemplateError) "undefined method `course_id' for nil:NilClass"

Application Error ali at ba-ravensburg.de
Mon May 24 19:53:08 EDT 2010 

A ActionView::TemplateError occurred in courses#show:

  undefined method `course_id' for nil:NilClass
  On line #18 of courses/show.rhtml

    15:       <p>Dieser Kurs ist der <b><%= @jahrgang %></b> te seit Beginn der WI</p>
    16:       <br/>
    17:           <!-- KursPage bearbeiten Button -->
    18:     <% if belongs_to_current_user?(@course) -%>
    19: 
    20:       <%= button_redirect('/courses/edit/' + @course.id.to_s, _('bearbeiten'), '')%>
    21: 

    app/models/course.rb:27:in `belongs_to_user?'
    lib/user_authorization.rb:20:in `belongs_to_current_user?'
    app/views/courses/show.rhtml:18:in `_run_erb_47app47views47courses47show46rhtml'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/base.rb:338:in `send'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/base.rb:338:in `execute'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/template_handlers/compilable.rb:29:in `send'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/template_handlers/compilable.rb:29:in `render'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/template.rb:35:in `render'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/template.rb:22:in `render_template'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/base.rb:245:in `render_file_without_gettext'
    /usr/local/lib/ruby/gems/1.8/gems/gettext-1.93.0/lib/gettext/rails.rb:289:in `render_file'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1108:in `render_for_file'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:841:in `render_with_no_layout'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/layout.rb:251:in `render_without_benchmark'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:51:in `render'
    /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/core_ext/benchmark.rb:8:in `realtime'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:51:in `render'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1157:in `default_render'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1163:in `perform_action_without_filters'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:580:in `call_filters'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:573:in `perform_action_without_benchmark'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
    /usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/rescue.rb:201:in `perform_action_without_caching'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/caching/sql_cache.rb:13:in `perform_action'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/connection_adapters/abstract/query_cache.rb:33:in `cache'
    /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/query_cache.rb:8:in `cache'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/caching/sql_cache.rb:12:in `perform_action'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:529:in `send'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:529:in `process_without_filters'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:569:in `process_without_session_management_support'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/session_management.rb:130:in `process'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:389:in `process'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:149:in `handle_request'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:107:in `dispatch'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:104:in `synchronize'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:104:in `dispatch'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:120:in `dispatch_cgi'
    /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:35:in `dispatch'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:76:in `process'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in `synchronize'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in `process'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:159:in `process_client'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `process_client'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `initialize'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `initialize'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:282:in `run'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `each'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `run'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:128:in `run'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/command.rb:212:in `run'
    /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281
    /usr/local/bin/mongrel_rails:19:in `load'
    /usr/local/bin/mongrel_rails:19

-------------------------------
Request:
-------------------------------

  * URL       : http://beta.alumnionrails.com/courses/show/1
  * IP address: 66.249.66.11
  * Parameters: {"action"=>"show", "id"=>"1", "controller"=>"courses"}
  * Rails root: /home/www/beta.alumnionrails.com/rails/releases/20100319115321

-------------------------------
Session:
-------------------------------

  * session id: "7f43e672bf8def02aa7e3e88fc0b3cdf"
  * data: {"flash"=>{}}

-------------------------------
Environment:
-------------------------------

  * GATEWAY_INTERFACE      : CGI/1.2
  
  * HTTP_ACCEPT            : */*
  
  * HTTP_ACCEPT_ENCODING   : gzip,deflate
  
  * HTTP_CONNECTION        : Keep-Alive
  
  * HTTP_FROM              : googlebot(at)googlebot.com
  
  * HTTP_HOST              : 127.0.0.1:8070
  
  * HTTP_USER_AGENT        : Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
  
  * HTTP_VERSION           : HTTP/1.1
  
  * HTTP_X_FORWARDED_FOR   : 66.249.66.11
  
  * HTTP_X_FORWARDED_HOST  : beta.alumnionrails.com
  
  * HTTP_X_FORWARDED_SERVER: beta.alumnionrails.com
  
  * PATH_INFO              : /courses/show/1
  
  * REMOTE_ADDR            : 127.0.0.1
  
  * REQUEST_METHOD         : GET
  
  * REQUEST_PATH           : /courses/show/1
  
  * REQUEST_URI            : /courses/show/1
  
  * SCRIPT_NAME            : /
  
  * SERVER_NAME            : 127.0.0.1
  
  * SERVER_PORT            : 8070
  
  * SERVER_PROTOCOL        : HTTP/1.1
  
  * SERVER_SOFTWARE        : Mongrel 1.1.5
  
  
  * Process: 8696
  * Server : s15280848

-------------------------------
Backtrace:
-------------------------------

  On line #18 of courses/show.rhtml
  
      15:       <p>Dieser Kurs ist der <b><%= @jahrgang %></b> te seit Beginn der WI</p>
      16:       <br/>
      17:           <!-- KursPage bearbeiten Button -->
      18:     <% if belongs_to_current_user?(@course) -%>
      19: 
      20:       <%= button_redirect('/courses/edit/' + @course.id.to_s, _('bearbeiten'), '')%>
      21: 
  
      app/models/course.rb:27:in `belongs_to_user?'
      lib/user_authorization.rb:20:in `belongs_to_current_user?'
      app/views/courses/show.rhtml:18:in `_run_erb_47app47views47courses47show46rhtml'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/base.rb:338:in `send'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/base.rb:338:in `execute'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/template_handlers/compilable.rb:29:in `send'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/template_handlers/compilable.rb:29:in `render'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/template.rb:35:in `render'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/template.rb:22:in `render_template'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_view/base.rb:245:in `render_file_without_gettext'
      /usr/local/lib/ruby/gems/1.8/gems/gettext-1.93.0/lib/gettext/rails.rb:289:in `render_file'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1108:in `render_for_file'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:841:in `render_with_no_layout'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/layout.rb:251:in `render_without_benchmark'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:51:in `render'
      /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.1.0/lib/active_support/core_ext/benchmark.rb:8:in `realtime'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:51:in `render'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1157:in `default_render'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:1163:in `perform_action_without_filters'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:580:in `call_filters'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:573:in `perform_action_without_benchmark'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
      /usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/rescue.rb:201:in `perform_action_without_caching'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/caching/sql_cache.rb:13:in `perform_action'
      /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/connection_adapters/abstract/query_cache.rb:33:in `cache'
      /usr/local/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/query_cache.rb:8:in `cache'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/caching/sql_cache.rb:12:in `perform_action'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:529:in `send'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:529:in `process_without_filters'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/filters.rb:569:in `process_without_session_management_support'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/session_management.rb:130:in `process'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/base.rb:389:in `process'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:149:in `handle_request'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:107:in `dispatch'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:104:in `synchronize'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:104:in `dispatch'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:120:in `dispatch_cgi'
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.0/lib/action_controller/dispatcher.rb:35:in `dispatch'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:76:in `process'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in `synchronize'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/rails.rb:74:in `process'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:159:in `process_client'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `process_client'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `initialize'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `initialize'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:282:in `run'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `each'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/configurator.rb:281:in `run'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:128:in `run'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/lib/mongrel/command.rb:212:in `run'
      /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.5/bin/mongrel_rails:281
      /usr/local/bin/mongrel_rails:19:in `load'
      /usr/local/bin/mongrel_rails:19

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