Description of problem:

Clicking the Events page for a system generates a stacktrace in the backend:

  NoMethodError: undefined method `class_name' for #<Class:0x0000000555c990>

Version-Release number of selected component (if applicable):

* apr-util-ldap-1.3.9-3.el6_0.1.x86_64
* candlepin-0.8.25-1.el6sam.noarch
* candlepin-scl-1-5.el6_4.noarch
* candlepin-scl-quartz-2.1.5-5.el6_4.noarch
* candlepin-scl-rhino-1.7R3-1.el6_4.noarch
* candlepin-scl-runtime-1-5.el6_4.noarch
* candlepin-selinux-0.8.25-1.el6sam.noarch
* candlepin-tomcat6-0.8.25-1.el6sam.noarch
* elasticsearch-0.19.9-8.el6sat.noarch
* foreman-1.3.0-18.el6sat.noarch
* foreman-compute-1.3.0-18.el6sat.noarch
* foreman-libvirt-1.3.0-18.el6sat.noarch
* foreman-postgresql-1.3.0-18.el6sat.noarch
* foreman-proxy-1.3.0-3.el6sat.noarch
* katello-1.4.6-39.el6sat.noarch
* katello-all-1.4.6-39.el6sat.noarch
* katello-candlepin-cert-key-pair-1.0-1.noarch
* katello-certs-tools-1.4.4-1.el6sat.noarch
* katello-cli-1.4.3-24.el6sat.noarch
* katello-cli-common-1.4.3-24.el6sat.noarch
* katello-common-1.4.6-39.el6sat.noarch
* katello-configure-1.4.7-5.el6sat.noarch
* katello-configure-foreman-1.4.7-5.el6sat.noarch
* katello-configure-foreman-proxy-1.4.7-5.el6sat.noarch
* katello-foreman-all-1.4.6-39.el6sat.noarch
* katello-glue-candlepin-1.4.6-39.el6sat.noarch
* katello-glue-elasticsearch-1.4.6-39.el6sat.noarch
* katello-glue-pulp-1.4.6-39.el6sat.noarch
* katello-qpid-broker-key-pair-1.0-1.noarch
* katello-qpid-client-key-pair-1.0-1.noarch
* katello-selinux-1.4.4-4.el6sat.noarch
* openldap-2.4.23-31.el6.x86_64
* pulp-katello-plugins-0.2-1.el6sat.noarch
* pulp-nodes-common-2.3.0-0.22.beta.el6sat.noarch
* pulp-nodes-parent-2.3.0-0.22.beta.el6sat.noarch
* pulp-puppet-plugins-2.3.0-0.22.beta.el6sat.noarch
* pulp-rpm-plugins-2.3.0-0.22.beta.el6sat.noarch
* pulp-selinux-2.3.0-0.22.beta.el6sat.noarch
* pulp-server-2.3.0-0.22.beta.el6sat.noarch
* python-ldap-2.3.10-1.el6.x86_64
* ruby193-rubygem-ldap_fluff-0.2.2-2.el6sat.noarch
* ruby193-rubygem-net-ldap-0.3.1-3.el6sat.noarch
* ruby193-rubygem-runcible-1.0.7-1.el6sat.noarch
* signo-0.0.22-2.el6sat.noarch
* signo-katello-0.0.22-2.el6sat.noarch

How reproducible:


Steps to Reproduce:
1. Register a client against your server
2. Select the client from the Systems page
3. Click the Events page

Actual results:

Nothing happens in the UI but there's a stacktrace in the backend


Expected results:


Additional info:

==> /var/log/katello/production.log <==
[ERROR 2013-10-20 17:02:32 app d4fb8d0e55af5fdab10c92e9f1320afc #16883] NoMethodError: undefined method `class_name' for #<Class:0x0000000555c990>
 | /opt/rh/ruby193/root/usr/share/gems/gems/activerecord-3.2.8/lib/active_record/dynamic_matchers.rb:55:in `method_missing'
 | /usr/share/katello/app/controllers/api/v2/systems_controller.rb:100:in `tasks'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/abstract_controller/base.rb:167:in `process_action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_controller/metal/rendering.rb:10:in `process_action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/abstract_controller/callbacks.rb:18:in `block in process_action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:492:in `block in _run__4465084161216648566__process_action__2536152455989398093__callbacks'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:215:in `block in _conditional_callback_around_3926'
 | /usr/share/katello/app/lib/util/thread_session.rb:110:in `thread_locals'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:214:in `_conditional_callback_around_3926'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:447:in `_run__4465084161216648566__process_action__2536152455989398093__callbacks'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:405:in `__run_callback'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:81:in `run_callbacks'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/abstract_controller/callbacks.rb:17:in `process_action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_controller/metal/rescue.rb:29:in `process_action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/notifications.rb:123:in `block in instrument'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/notifications.rb:123:in `instrument'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_controller/metal/instrumentation.rb:29:in `process_action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activerecord-3.2.8/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
 | /usr/share/katello/app/controllers/api/api_controller.rb:85:in `process_action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/abstract_controller/base.rb:121:in `process'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/abstract_controller/rendering.rb:45:in `process'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_controller/metal.rb:203:in `dispatch'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_controller/metal.rb:246:in `block in action'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:73:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:36:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/routing/mapper.rb:42:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/journey-1.0.4/lib/journey/router.rb:68:in `block in call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/journey-1.0.4/lib/journey/router.rb:56:in `each'
 | /opt/rh/ruby193/root/usr/share/gems/gems/journey-1.0.4/lib/journey/router.rb:56:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:600:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/apipie-rails-0.0.23/lib/apipie/static_dispatcher.rb:56:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/static.rb:62:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/warden-1.0.3/lib/warden/manager.rb:35:in `block in call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/warden-1.0.3/lib/warden/manager.rb:34:in `catch'
 | /opt/rh/ruby193/root/usr/share/gems/gems/warden-1.0.3/lib/warden/manager.rb:34:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-openid-1.3.1/lib/rack/openid.rb:98:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/sass-3.1.20/lib/sass/plugin/rack.rb:54:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/etag.rb:23:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/conditionalget.rb:25:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/head.rb:14:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/params_parser.rb:21:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/flash.rb:242:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/session/abstract/id.rb:205:in `context'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/session/abstract/id.rb:200:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/cookies.rb:339:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activerecord-3.2.8/lib/active_record/query_cache.rb:64:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activerecord-3.2.8/lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:405:in `_run__1546518988198770143__call__2787426689885664039__callbacks'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:405:in `__run_callback'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:81:in `run_callbacks'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/rack/logger.rb:26:in `call_app'
 | /opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/rack/logger.rb:16:in `call'
 | /usr/share/katello/lib/katello/middleware/log_request_uuid.rb:22:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/actionpack-3.2.8/lib/action_dispatch/middleware/request_id.rb:22:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/methodoverride.rb:21:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/runtime.rb:17:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/activesupport-3.2.8/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/lock.rb:15:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-cache-1.2/lib/rack/cache/context.rb:185:in `lookup'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/engine.rb:479:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/application.rb:223:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/railties-3.2.8/lib/rails/railtie/configurable.rb:30:in `method_missing'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/builder.rb:134:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/urlmap.rb:64:in `block in call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/urlmap.rb:49:in `each'
 | /opt/rh/ruby193/root/usr/share/gems/gems/rack-1.4.1/lib/rack/urlmap.rb:49:in `call'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/lib/thin/connection.rb:80:in `block in pre_process'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/lib/thin/connection.rb:78:in `catch'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/lib/thin/connection.rb:78:in `pre_process'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/lib/thin/connection.rb:53:in `process'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/lib/thin/connection.rb:38:in `receive_data'
 | /opt/rh/ruby193/root/usr/share/gems/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine'
 | /opt/rh/ruby193/root/usr/share/gems/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/lib/thin/backends/base.rb:61:in `start'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/lib/thin/server.rb:159:in `start'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/lib/thin/controllers/controller.rb:86:in `start'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/lib/thin/runner.rb:185:in `run_command'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/lib/thin/runner.rb:151:in `run!'
 | /opt/rh/ruby193/root/usr/share/gems/gems/thin-1.3.1/bin/thin:6:in `<top (required)>'
 | /usr/share/katello/script/thin:24:in `load'
 | /usr/share/katello/script/thin:24:in `<main>'