嗨，所有在感恩节修复错误的 SO 用户，
我的延迟作业设置工作正常，我让它在生产和开发中运行，但是在访问 rails admin 的用户部分时，我收到错误
未初始化的常量 ActiveRecord::Base::Delayed::Job
我应该在某个地方定义一个延迟的工作类吗？如果是这样，那么正确的语法是什么？Delayed::Job 还是 DelayedJob？我试过这样做没有成功。
我还运行了迁移以创建作业表。也许在某处定义的用户和延迟工作之间存在关联？不太确定...
这是一个完整的跟踪：
ActionView::Template::Error (uninitialized constant ActiveRecord::Base::Delayed::Job):
10:
11: export_action = RailsAdmin::Config::Actions.find(:export, { :controller => self.controller, :abstract_model => @abstract_model })
12: export_action = export_action && authorized?(export_action.authorization_key, @abstract_model) ? export_action : nil
13:
14: properties = @model_config.list.with(:controller => self.controller, :view => self, :object => @abstract_model.model.new).visible_fields
15: # columns paginate
16: @filterable_fields = @model_config.list.fields.select(&:filterable?)
activerecord (3.2.3) lib/active_record/inheritance.rb:119:in `compute_type'
activerecord (3.2.3) lib/active_record/reflection.rb:172:in `klass'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/adapters/active_record.rb:233:in `association_model_lookup'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/adapters/active_record.rb:70:in `block (2 levels) in associations'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/fields/association.rb:63:in `call'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/fields/association.rb:63:in `associated_model_config'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/fields/association.rb:33:in `block in <class:Association>'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/configurable.rb:68:in `instance_eval'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/configurable.rb:68:in `block in register_instance_option'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/configurable.rb:42:in `block in register_instance_option'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/proxyable/proxy.rb:31:in `method_missing'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/has_fields.rb:113:in `select'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/has_fields.rb:113:in `visible_fields'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/proxyable/proxy.rb:31:in `method_missing'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/app/views/rails_admin/main/index.html.haml:13:in `__var_www_apps_miracleticket_shared_bundle_ruby_______bundler_gems_rails_admin____e____d__f_app_views_rails_admin_main_index_html_haml___3620510256847226470_59069620'
actionpack (3.2.3) lib/action_view/template.rb:143:in `block in render'
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actionpack (3.2.3) lib/action_view/template.rb:141:in `render'
actionpack (3.2.3) lib/action_view/renderer/template_renderer.rb:47:in `block (2 levels) in render_template'
actionpack (3.2.3) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
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actionpack (3.2.3) lib/action_view/renderer/template_renderer.rb:45:in `render_template'
actionpack (3.2.3) lib/action_view/renderer/template_renderer.rb:18:in `render'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:156:in `block in render_with_newrelic'
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newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:155:in `render_with_newrelic'
actionpack (3.2.3) lib/action_view/renderer/renderer.rb:36:in `render_template'
actionpack (3.2.3) lib/action_view/renderer/renderer.rb:17:in `render'
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actionpack (3.2.3) lib/action_controller/metal/streaming.rb:225:in `_render_template'
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actionpack (3.2.3) lib/action_controller/metal/renderers.rb:28:in `render_to_body'
actionpack (3.2.3) lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
actionpack (3.2.3) lib/abstract_controller/rendering.rb:88:in `render'
actionpack (3.2.3) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
activesupport (3.2.3) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/home/shark/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/benchmark.rb:295:in `realtime'
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activerecord (3.2.3) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:39:in `render'
remotipart (1.0.2) lib/remotipart/render_overrides.rb:8:in `render'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/actions/index.rb:35:in `block (4 levels) in <class:Index>'
actionpack (3.2.3) lib/action_controller/metal/mime_responds.rb:196:in `call'
actionpack (3.2.3) lib/action_controller/metal/mime_responds.rb:196:in `respond_to'
/var/www/apps/miracleticket/shared/bundle/ruby/1.9.1/bundler/gems/rails_admin-556e9032d23f/lib/rails_admin/config/actions/index.rb:32:in `block (2 levels) in <class:Index>'
(eval):8:in `instance_eval'
(eval):8:in `index'
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actionpack (3.2.3) lib/abstract_controller/base.rb:167:in `process_action'
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activesupport (3.2.3) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.3) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.3) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.3) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.3) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.3) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.3) lib/action_controller/metal/params_wrapper.rb:205:in `process_action'
activerecord (3.2.3) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:34:in `block in process_action'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:268:in `block in perform_action_with_newrelic_trace'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/method_tracer.rb:242:in `trace_execution_scoped'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:263:in `perform_action_with_newrelic_trace'
newrelic_rpm (3.5.0.1) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:33:in `process_action'
actionpack (3.2.3) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.3) lib/abstract_controller/rendering.rb:45:in `process'
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actionpack (3.2.3) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.3) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:73:in `call'
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journey (1.0.4) lib/journey/router.rb:68:in `block in call'
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actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:600:in `call'
railties (3.2.3) lib/rails/engine.rb:479:in `call'
railties (3.2.3) lib/rails/railtie/configurable.rb:30:in `method_missing'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
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actionpack (3.2.3) lib/action_dispatch/routing/route_set.rb:600:in `call'
rack-pjax (0.6.0) lib/rack/pjax.rb:12:in `call'
omniauth (1.1.1) lib/omniauth/strategy.rb:177:in `call!'
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newrelic_rpm (3.5.0.1) lib/new_relic/rack/error_collector.rb:8:in `call'
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sass (3.2.2) lib/sass/plugin/rack.rb:54:in `call'
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warden (1.2.1) lib/warden/manager.rb:35:in `block in call'
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rack (1.4.1) lib/rack/etag.rb:23:in `call'
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actionpack (3.2.3) lib/action_dispatch/middleware/head.rb:14:in `call'
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<internal:prelude>:10:in `synchronize'
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/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/home/shark/.rvm/gems/ruby-1.9.3-p194/gems/passenger-3.0.12/helper-scripts/passenger-spawn-server:99:in `<main>'