Filters broken with mongoid field alias

[sepastian]

I am using rails_admin with mongoid. When using mongoid's :as options, filters in rails_admin stop working.

For example, the following works as expected:

class A
    include Mongoid::Document
    field :long_name, :type => String
    rails_admin do
        list do
            filters [ :long_name ]
            field :long_name
        end
    end
end

While this does not:

class A
    include Mongoid::Document
    field :long_name, :as => :l, :type => String
    rails_admin do
        list do
            filters [ :long_name ]
            field :long_name
        end
    end
end

The name of the field has changed from :long_name to :l, :long_name is now stored in field.options[:as]. Mongoid maps between both names transparently, rails_admin does not. A workaround exists:

class A
    include Mongoid::Document
    field :long_name, :as => :l, :type => String
    rails_admin do
        list do
            filters [ :l ]
            field :l
        end
    end
end

For better readability and consistency with mongoid's behavior, rails_admin should map between field names and aliases. It should be possible to use either the field name or the alias everywhere.

I would like to provide a pull request, if you can point me in the right direction. Is there a central place in rails_admin's mongoid adapter where field name resolution is taking place? Where should I start looking, or how would you go about improving this?

[sepastian]

And here's a stack trace:

/home/sebastian/Code/rails_admin/app/views/rails_admin/main/index.html.haml:39:in block in __home_sebastian__ode_rails_admin_app_views_rails_admin_main_index_html_haml___1068259551_93640420' /home/sebastian/Code/rails_admin/app/views/rails_admin/main/index.html.haml:33:inmap'
/home/sebastian/Code/rails_admin/app/views/rails_admin/main/index.html.haml:33:in __home_sebastian__ode_rails_admin_app_views_rails_admin_main_index_html_haml___1068259551_93640420' actionpack (4.0.0) lib/action_view/template.rb:143:inblock in render'
activesupport (4.0.0) lib/active_support/notifications.rb:161:in instrument' actionpack (4.0.0) lib/action_view/template.rb:141:inrender'
actionpack (4.0.0) lib/action_view/renderer/template_renderer.rb:49:in block (2 levels) in render_template' actionpack (4.0.0) lib/action_view/renderer/abstract_renderer.rb:38:inblock in instrument'
activesupport (4.0.0) lib/active_support/notifications.rb:159:in block in instrument' activesupport (4.0.0) lib/active_support/notifications/instrumenter.rb:20:ininstrument'
activesupport (4.0.0) lib/active_support/notifications.rb:159:in instrument' actionpack (4.0.0) lib/action_view/renderer/abstract_renderer.rb:38:ininstrument'
actionpack (4.0.0) lib/action_view/renderer/template_renderer.rb:48:in block in render_template' actionpack (4.0.0) lib/action_view/renderer/template_renderer.rb:56:inrender_with_layout'
actionpack (4.0.0) lib/action_view/renderer/template_renderer.rb:47:in render_template' actionpack (4.0.0) lib/action_view/renderer/template_renderer.rb:17:inrender'
actionpack (4.0.0) lib/action_view/renderer/renderer.rb:42:in render_template' actionpack (4.0.0) lib/action_view/renderer/renderer.rb:23:inrender'
actionpack (4.0.0) lib/abstract_controller/rendering.rb:127:in _render_template' actionpack (4.0.0) lib/action_controller/metal/streaming.rb:219:in_render_template'
actionpack (4.0.0) lib/abstract_controller/rendering.rb:120:in render_to_body' actionpack (4.0.0) lib/action_controller/metal/rendering.rb:33:inrender_to_body'
actionpack (4.0.0) lib/action_controller/metal/renderers.rb:26:in render_to_body' actionpack (4.0.0) lib/abstract_controller/rendering.rb:97:inrender'
actionpack (4.0.0) lib/action_controller/metal/rendering.rb:16:in render' actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:41:inblock (2 levels) in render'
activesupport (4.0.0) lib/active_support/core_ext/benchmark.rb:12:in block in ms' /usr/lib/ruby/1.9.1/benchmark.rb:295:inrealtime'
activesupport (4.0.0) lib/active_support/core_ext/benchmark.rb:12:in ms' actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:41:inblock in render'
actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:84:in cleanup_view_runtime' actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:40:inrender'
remotipart (1.2.1) lib/remotipart/render_overrides.rb:14:in render_with_remotipart' /home/sebastian/Code/rails_admin/lib/rails_admin/config/actions/index.rb:35:inblock (4 levels) in class:Index'
actionpack (4.0.0) lib/action_controller/metal/mime_responds.rb:191:in call' actionpack (4.0.0) lib/action_controller/metal/mime_responds.rb:191:inrespond_to'
/home/sebastian/Code/rails_admin/lib/rails_admin/config/actions/index.rb:32:in block (2 levels) in <class:Index>' (eval):8:ininstance_eval'
(eval):8:in index' actionpack (4.0.0) lib/action_controller/metal/implicit_render.rb:4:insend_action'
actionpack (4.0.0) lib/abstract_controller/base.rb:189:in process_action' actionpack (4.0.0) lib/action_controller/metal/rendering.rb:10:inprocess_action'
actionpack (4.0.0) lib/abstract_controller/callbacks.rb:18:in block in process_action' activesupport (4.0.0) lib/active_support/callbacks.rb:463:in_run__319947751__process_action__callbacks'
activesupport (4.0.0) lib/active_support/callbacks.rb:80:in run_callbacks' actionpack (4.0.0) lib/abstract_controller/callbacks.rb:17:inprocess_action'
actionpack (4.0.0) lib/action_controller/metal/rescue.rb:29:in process_action' actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:31:inblock in process_action'
activesupport (4.0.0) lib/active_support/notifications.rb:159:in block in instrument' activesupport (4.0.0) lib/active_support/notifications/instrumenter.rb:20:ininstrument'
activesupport (4.0.0) lib/active_support/notifications.rb:159:in instrument' actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:30:inprocess_action'
actionpack (4.0.0) lib/action_controller/metal/params_wrapper.rb:245:in process_action' actionpack (4.0.0) lib/abstract_controller/base.rb:136:inprocess'
actionpack (4.0.0) lib/abstract_controller/rendering.rb:44:in process' actionpack (4.0.0) lib/action_controller/metal.rb:195:indispatch'
actionpack (4.0.0) lib/action_controller/metal/rack_delegation.rb:13:in dispatch' actionpack (4.0.0) lib/action_controller/metal.rb:231:inblock in action'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:80:in call' actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:80:indispatch'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:48:in call' actionpack (4.0.0) lib/action_dispatch/journey/router.rb:71:inblock in call'
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:in each' actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:incall'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:655:in call' railties (4.0.0) lib/rails/engine.rb:511:incall'
railties (4.0.0) lib/rails/railtie/configurable.rb:30:in method_missing' actionpack (4.0.0) lib/action_dispatch/journey/router.rb:71:inblock in call'
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:in each' actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:incall'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:655:in call' rack-pjax (0.7.0) lib/rack/pjax.rb:12:incall'
/home/sebastian/.bundler/ruby/1.9.1/mongoid-b84b811d4777/lib/rack/mongoid/middleware/identity_map.rb:34:in block in call' /home/sebastian/.bundler/ruby/1.9.1/mongoid-b84b811d4777/lib/mongoid/unit_of_work.rb:39:inunit_of_work'
/home/sebastian/.bundler/ruby/1.9.1/mongoid-b84b811d4777/lib/rack/mongoid/middleware/identity_map.rb:34:in call' warden (1.2.3) lib/warden/manager.rb:35:inblock in call'
warden (1.2.3) lib/warden/manager.rb:34:in catch' warden (1.2.3) lib/warden/manager.rb:34:incall'
rack (1.5.2) lib/rack/etag.rb:23:in call' rack (1.5.2) lib/rack/conditionalget.rb:25:incall'
rack (1.5.2) lib/rack/head.rb:11:in call' remotipart (1.2.1) lib/remotipart/middleware.rb:27:incall'
actionpack (4.0.0) lib/action_dispatch/middleware/params_parser.rb:27:in call' actionpack (4.0.0) lib/action_dispatch/middleware/flash.rb:241:incall'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in context' rack (1.5.2) lib/rack/session/abstract/id.rb:220:incall'
actionpack (4.0.0) lib/action_dispatch/middleware/cookies.rb:486:in call' actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:29:inblock in call'
activesupport (4.0.0) lib/active_support/callbacks.rb:373:in _run__28556109__call__callbacks' activesupport (4.0.0) lib/active_support/callbacks.rb:80:inrun_callbacks'
actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:27:in call' actionpack (4.0.0) lib/action_dispatch/middleware/reloader.rb:64:incall'
actionpack (4.0.0) lib/action_dispatch/middleware/remote_ip.rb:76:in call' actionpack (4.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:incall'
actionpack (4.0.0) lib/action_dispatch/middleware/show_exceptions.rb:30:in call' railties (4.0.0) lib/rails/rack/logger.rb:38:incall_app'
railties (4.0.0) lib/rails/rack/logger.rb:21:in block in call' activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:inblock in tagged'
activesupport (4.0.0) lib/active_support/tagged_logging.rb:25:in tagged' activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:intagged'
railties (4.0.0) lib/rails/rack/logger.rb:21:in call' actionpack (4.0.0) lib/action_dispatch/middleware/request_id.rb:21:incall'
rack (1.5.2) lib/rack/methodoverride.rb:21:in call' rack (1.5.2) lib/rack/runtime.rb:17:incall'
activesupport (4.0.0) lib/active_support/cache/strategy/local_cache.rb:83:in call' rack (1.5.2) lib/rack/lock.rb:17:incall'
actionpack (4.0.0) lib/action_dispatch/middleware/static.rb:64:in call' railties (4.0.0) lib/rails/engine.rb:511:incall'
railties (4.0.0) lib/rails/application.rb:97:in call' rack (1.5.2) lib/rack/lock.rb:17:incall'
rack (1.5.2) lib/rack/content_length.rb:14:in call' rack (1.5.2) lib/rack/handler/webrick.rb:60:inservice'
/usr/lib/ruby/1.9.1/webrick/httpserver.rb:138:in service' /usr/lib/ruby/1.9.1/webrick/httpserver.rb:94:inrun'
/usr/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

[mshibuya]

Dup of #1745.