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  1. Mongoid
  2. MONGOID-3740

Getting Missing attribute: '_id'. error when querying in rails..

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    Details

    • Type: Task
    • Status: Closed
    • Resolution: Done
    • Affects Version/s: None
    • Fix Version/s: 5.0.0
    • Component/s: None
    • Labels:
      None

      Description

      I am getting this error

      Missing attribute: '_id'.
      

      when I do the following in my view:

      <%= line_chart @events.only(:name).group_by(&:id)%>
      

      My stack trace is the following:

      mongoid (4.0.0) lib/mongoid/attributes.rb:95:in `read_attribute'
      mongoid (4.0.0) lib/mongoid/fields.rb:409:in `block (2 levels) in create_field_getter'
      mongoid (4.0.0) lib/mongoid/contextual/mongo.rb:648:in `yield_document'
      mongoid (4.0.0) lib/mongoid/contextual/mongo.rb:123:in `block in each'
      moped (2.0.0) lib/moped/cursor.rb:28:in `block in each'
      moped (2.0.0) lib/moped/cursor.rb:28:in `each'
      moped (2.0.0) lib/moped/cursor.rb:28:in `each'
      moped (2.0.0) lib/moped/query.rb:77:in `each'
      mongoid (4.0.0) lib/mongoid/contextual/mongo.rb:122:in `each'
      mongoid (4.0.0) lib/mongoid/contextual.rb:20:in `each'
      app/views/events/index.html.erb:4:in `group_by'
      app/views/events/index.html.erb:4:in `_app_views_events_index_html_erb__1368044966165747902_2189699640'
      actionpack (4.0.2) lib/action_view/template.rb:143:in `block in render'
      activesupport (4.0.2) lib/active_support/notifications.rb:161:in `instrument'
      actionpack (4.0.2) lib/action_view/template.rb:141:in `render'
      actionpack (4.0.2) lib/action_view/renderer/template_renderer.rb:49:in `block (2 levels) in render_template'
      actionpack (4.0.2) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
      activesupport (4.0.2) lib/active_support/notifications.rb:159:in `block in instrument'
      activesupport (4.0.2) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
      activesupport (4.0.2) lib/active_support/notifications.rb:159:in `instrument'
      actionpack (4.0.2) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
      actionpack (4.0.2) lib/action_view/renderer/template_renderer.rb:48:in `block in render_template'
      actionpack (4.0.2) lib/action_view/renderer/template_renderer.rb:56:in `render_with_layout'
      actionpack (4.0.2) lib/action_view/renderer/template_renderer.rb:47:in `render_template'
      actionpack (4.0.2) lib/action_view/renderer/template_renderer.rb:17:in `render'
      actionpack (4.0.2) lib/action_view/renderer/renderer.rb:42:in `render_template'
      actionpack (4.0.2) lib/action_view/renderer/renderer.rb:23:in `render'
      actionpack (4.0.2) lib/abstract_controller/rendering.rb:127:in `_render_template'
      actionpack (4.0.2) lib/action_controller/metal/streaming.rb:219:in `_render_template'
      actionpack (4.0.2) lib/abstract_controller/rendering.rb:120:in `render_to_body'
      actionpack (4.0.2) lib/action_controller/metal/rendering.rb:33:in `render_to_body'
      actionpack (4.0.2) lib/action_controller/metal/renderers.rb:26:in `render_to_body'
      actionpack (4.0.2) lib/abstract_controller/rendering.rb:97:in `render'
      actionpack (4.0.2) lib/action_controller/metal/rendering.rb:16:in `render'
      actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render'
      activesupport (4.0.2) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
      /Users/shaunkoo/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'
      activesupport (4.0.2) lib/active_support/core_ext/benchmark.rb:12:in `ms'
      actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:41:in `block in render'
      actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime'
      actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:40:in `render'
      actionpack (4.0.2) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
      actionpack (4.0.2) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
      actionpack (4.0.2) lib/abstract_controller/base.rb:189:in `process_action'
      actionpack (4.0.2) lib/action_controller/metal/rendering.rb:10:in `process_action'
      actionpack (4.0.2) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
      activesupport (4.0.2) lib/active_support/callbacks.rb:423:in `_run__922333862670860616__process_action__callbacks'
      activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks'
      actionpack (4.0.2) lib/abstract_controller/callbacks.rb:17:in `process_action'
      actionpack (4.0.2) lib/action_controller/metal/rescue.rb:29:in `process_action'
      actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
      activesupport (4.0.2) lib/active_support/notifications.rb:159:in `block in instrument'
      activesupport (4.0.2) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
      activesupport (4.0.2) lib/active_support/notifications.rb:159:in `instrument'
      actionpack (4.0.2) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
      actionpack (4.0.2) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
      actionpack (4.0.2) lib/abstract_controller/base.rb:136:in `process'
      actionpack (4.0.2) lib/abstract_controller/rendering.rb:44:in `process'
      actionpack (4.0.2) lib/action_controller/metal.rb:195:in `dispatch'
      actionpack (4.0.2) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
      actionpack (4.0.2) lib/action_controller/metal.rb:231:in `block in action'
      actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:80:in `call'
      actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
      actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:48:in `call'
      actionpack (4.0.2) lib/action_dispatch/journey/router.rb:71:in `block in call'
      actionpack (4.0.2) lib/action_dispatch/journey/router.rb:59:in `each'
      actionpack (4.0.2) lib/action_dispatch/journey/router.rb:59:in `call'
      actionpack (4.0.2) lib/action_dispatch/routing/route_set.rb:680:in `call'
      warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
      warden (1.2.3) lib/warden/manager.rb:34:in `catch'
      warden (1.2.3) lib/warden/manager.rb:34:in `call'
      rack (1.5.2) lib/rack/etag.rb:23:in `call'
      rack (1.5.2) lib/rack/conditionalget.rb:25:in `call'
      rack (1.5.2) lib/rack/head.rb:11:in `call'
      actionpack (4.0.2) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
      actionpack (4.0.2) lib/action_dispatch/middleware/flash.rb:241:in `call'
      rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
      rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
      actionpack (4.0.2) lib/action_dispatch/middleware/cookies.rb:486:in `call'
      actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
      activesupport (4.0.2) lib/active_support/callbacks.rb:373:in `_run__1468478628303893956__call__callbacks'
      activesupport (4.0.2) lib/active_support/callbacks.rb:80:in `run_callbacks'
      actionpack (4.0.2) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
      actionpack (4.0.2) lib/action_dispatch/middleware/reloader.rb:64:in `call'
      actionpack (4.0.2) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
      actionpack (4.0.2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
      actionpack (4.0.2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
      railties (4.0.2) lib/rails/rack/logger.rb:38:in `call_app'
      railties (4.0.2) lib/rails/rack/logger.rb:20:in `block in call'
      activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in `block in tagged'
      activesupport (4.0.2) lib/active_support/tagged_logging.rb:25:in `tagged'
      activesupport (4.0.2) lib/active_support/tagged_logging.rb:67:in `tagged'
      railties (4.0.2) lib/rails/rack/logger.rb:20:in `call'
      actionpack (4.0.2) lib/action_dispatch/middleware/request_id.rb:21:in `call'
      rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
      rack (1.5.2) lib/rack/runtime.rb:17:in `call'
      activesupport (4.0.2) lib/active_support/cache/strategy/local_cache.rb:83:in `call'
      rack (1.5.2) lib/rack/lock.rb:17:in `call'
      actionpack (4.0.2) lib/action_dispatch/middleware/static.rb:64:in `call'
      rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
      railties (4.0.2) lib/rails/engine.rb:511:in `call'
      railties (4.0.2) lib/rails/application.rb:97:in `call'
      rack (1.5.2) lib/rack/content_length.rb:14:in `call'
      thin (1.6.2) lib/thin/connection.rb:86:in `block in pre_process'
      thin (1.6.2) lib/thin/connection.rb:84:in `catch'
      thin (1.6.2) lib/thin/connection.rb:84:in `pre_process'
      thin (1.6.2) lib/thin/connection.rb:53:in `process'
      thin (1.6.2) lib/thin/connection.rb:39:in `receive_data'
      eventmachine (1.0.3) lib/eventmachine.rb:187:in `run_machine'
      eventmachine (1.0.3) lib/eventmachine.rb:187:in `run'
      thin (1.6.2) lib/thin/backends/base.rb:73:in `start'
      thin (1.6.2) lib/thin/server.rb:162:in `start'
      rack (1.5.2) lib/rack/handler/thin.rb:16:in `run'
      rack (1.5.2) lib/rack/server.rb:264:in `start'
      railties (4.0.2) lib/rails/commands/server.rb:84:in `start'
      railties (4.0.2) lib/rails/commands.rb:76:in `block in <top (required)>'
      railties (4.0.2) lib/rails/commands.rb:71:in `tap'
      railties (4.0.2) lib/rails/commands.rb:71:in `<top (required)>'
      bin/rails:4:in `require'
      bin/rails:4:in `<main>'
      

      Any clue what might be the issue?

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