Undefined method "reorder" for #<Array:0xbc38600> using ActiveAdmin - ruby-on-rails

Question

I have a problem with ActiveAdmin using Ruby ruby 1.9.2p290 and Ruby on Rails 3.2.1.
I used this wiki page to setup the resource for the AdminUsers that works perfectly: Your First Admin Resource: AdminUser
After that I wanted to create the resource for my project model. The migrations for that looks like this:
class CreateProjects < ActiveRecord::Migration
def change
create_table :projects do |t|
t.string :name
t.text :description
t.boolean :isactive
t.timestamps
end
end
end
class AddSlugToProjects < ActiveRecord::Migration
def change
add_column :projects, :slug, :string
add_index :projects, :slug
end
end
My project model:
class Project < ActiveRecord::Base
scope :isactive, :conditions => ["isactive = ?",true]
extend FriendlyId
friendly_id :name, use: [:slugged, :history]
attr_accessible :name, :description, :isactive
end
And that's the project_controller:
class ProjectsController < ApplicationController
def index
#
# #projects gets filled in application_controller to be always
# available for the twitter bootstrap navbar
# #projects = Project.isactive.find(:all, :order => 'LOWER(name) asc')
#
end
def show
#project = Project.isactive.find(params[:id])
if request.path != project_path(#project)
redirect_to #project, :status => :moved_permanently
end
end
end
The admin/projects.rb is currently 'empty'
ActiveAdmin.register Project do
end
And after all that, everything I get is the following error:
Started GET "/admin/projects" for 192.168.0.2 at 2012-02-21 20:58:49 +0100
Processing by Admin::ProjectsController#index as HTML
Project Load (0.1ms) SELECT "projects".* FROM "projects" WHERE (isactive = 't') ORDER BY LOWER(name) asc
AdminUser Load (0.1ms) SELECT "admin_users".* FROM "admin_users" WHERE "admin_users"."id" = 2 LIMIT 1
Rendered /home/eins11/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/activeadmin-0.4.1/app/views/active_admin/resource/index.html.arb (11.7ms)
Completed 500 Internal Server Error in 54ms
ActionView::Template::Error (undefined method `reorder' for #<Array:0xa3ecd44>):
1: render renderer_for(:index)
activeadmin (0.4.1) lib/active_admin/views/pages/index.rb:41:in `items_in_collection?'
activeadmin (0.4.1) lib/active_admin/views/pages/index.rb:20:in `main_content'
activeadmin (0.4.1) lib/active_admin/views/pages/base.rb:116:in `block (2 levels) in build_main_content_wrapper'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:68:in `block in build_tag'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:96:in `with_current_dom_context'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:67:in `build_tag'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:77:in `insert_tag'
activeadmin (0.4.1) lib/active_admin/arbre/html/element.rb:17:in `div'
activeadmin (0.4.1) lib/active_admin/views/pages/base.rb:115:in `block in build_main_content_wrapper'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:68:in `block in build_tag'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:96:in `with_current_dom_context'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:67:in `build_tag'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:77:in `insert_tag'
activeadmin (0.4.1) lib/active_admin/arbre/html/element.rb:17:in `div'
activeadmin (0.4.1) lib/active_admin/views/pages/base.rb:114:in `build_main_content_wrapper'
activeadmin (0.4.1) lib/active_admin/views/pages/base.rb:98:in `block in build_page_content'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:68:in `block in build_tag'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:96:in `with_current_dom_context'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:67:in `build_tag'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:77:in `insert_tag'
activeadmin (0.4.1) lib/active_admin/arbre/html/element.rb:17:in `div'
activeadmin (0.4.1) lib/active_admin/views/pages/base.rb:97:in `build_page_content'
activeadmin (0.4.1) lib/active_admin/views/pages/base.rb:41:in `block (2 levels) in build_page'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:68:in `block in build_tag'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:96:in `with_current_dom_context'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:67:in `build_tag'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:77:in `insert_tag'
activeadmin (0.4.1) lib/active_admin/arbre/html/element.rb:17:in `div'
activeadmin (0.4.1) lib/active_admin/views/pages/base.rb:38:in `block in build_page'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:96:in `with_current_dom_context'
activeadmin (0.4.1) lib/active_admin/views/pages/base.rb:37:in `build_page'
activeadmin (0.4.1) lib/active_admin/views/pages/base.rb:10:in `build'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:63:in `build_tag'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:77:in `insert_tag'
activeadmin (0.4.1) lib/active_admin/arbre/builder.rb:41:in `method_missing'
activeadmin (0.4.1) lib/active_admin/view_helpers/renderer_helper.rb:21:in `render'
activeadmin (0.4.1) app/views/active_admin/resource/index.html.arb:1:in `__home_eins____rbenv_versions_______p____lib_ruby_gems_______gems_activeadmin_______app_views_active_admin_resource_index_html_arb___523541447_100786690'
actionpack (3.2.1) lib/action_view/template.rb:143:in `block in render'
activesupport (3.2.1) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.1) lib/action_view/template.rb:141:in `render'
actionpack (3.2.1) lib/action_view/renderer/template_renderer.rb:41:in `block (2 levels) in render_template'
actionpack (3.2.1) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (3.2.1) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.1) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.1) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (3.2.1) lib/action_view/renderer/template_renderer.rb:40:in `block in render_template'
actionpack (3.2.1) lib/action_view/renderer/template_renderer.rb:48:in `render_with_layout'
actionpack (3.2.1) lib/action_view/renderer/template_renderer.rb:39:in `render_template'
actionpack (3.2.1) lib/action_view/renderer/template_renderer.rb:12:in `render'
actionpack (3.2.1) lib/action_view/renderer/renderer.rb:36:in `render_template'
actionpack (3.2.1) lib/action_view/renderer/renderer.rb:17:in `render'
actionpack (3.2.1) lib/abstract_controller/rendering.rb:109:in `_render_template'
actionpack (3.2.1) lib/action_controller/metal/streaming.rb:225:in `_render_template'
actionpack (3.2.1) lib/abstract_controller/rendering.rb:103:in `render_to_body'
actionpack (3.2.1) lib/action_controller/metal/renderers.rb:28:in `render_to_body'
actionpack (3.2.1) lib/action_controller/metal/compatibility.rb:50:in `render_to_body'
actionpack (3.2.1) lib/abstract_controller/rendering.rb:88:in `render'
actionpack (3.2.1) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
activesupport (3.2.1) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/home/eins11/.rbenv/versions/1.9.2-p290/lib/ruby/1.9.1/benchmark.rb:310:in `realtime'
activesupport (3.2.1) lib/active_support/core_ext/benchmark.rb:5:in `ms'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:40:in `block in render'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:83:in `cleanup_view_runtime'
activerecord (3.2.1) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:39:in `render'
activeadmin (0.4.1) lib/active_admin/resource_controller/actions.rb:13:in `block (2 levels) in index'
actionpack (3.2.1) lib/action_controller/metal/responder.rb:229:in `call'
actionpack (3.2.1) lib/action_controller/metal/responder.rb:229:in `default_render'
actionpack (3.2.1) lib/action_controller/metal/responder.rb:160:in `to_html'
responders (0.6.5) lib/responders/flash_responder.rb:93:in `to_html'
actionpack (3.2.1) lib/action_controller/metal/responder.rb:153:in `respond'
actionpack (3.2.1) lib/action_controller/metal/responder.rb:146:in `call'
actionpack (3.2.1) lib/action_controller/metal/mime_responds.rb:238:in `respond_with'
inherited_resources (1.3.0) lib/inherited_resources/actions.rb:7:in `index'
activeadmin (0.4.1) lib/active_admin/resource_controller/actions.rb:11:in `index'
actionpack (3.2.1) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.1) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.1) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.1) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.1) lib/active_support/callbacks.rb:469:in `_run__639476650__process_action__1068992826__callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.1) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.1) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.1) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.1) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.1) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.1) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.1) lib/action_controller/metal/params_wrapper.rb:205:in `process_action'
activerecord (3.2.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.2.1) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.1) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.1) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.1) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.1) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:66:in `call'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:66:in `dispatch'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:30:in `call'
journey (1.0.1) lib/journey/router.rb:68:in `block in call'
journey (1.0.1) lib/journey/router.rb:56:in `each'
journey (1.0.1) lib/journey/router.rb:56:in `call'
actionpack (3.2.1) lib/action_dispatch/routing/route_set.rb:589:in `call'
sass (3.1.15) lib/sass/plugin/rack.rb:54:in `call'
warden (1.1.1) lib/warden/manager.rb:35:in `block in call'
warden (1.1.1) lib/warden/manager.rb:34:in `catch'
warden (1.1.1) lib/warden/manager.rb:34:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.1) lib/rack/etag.rb:23:in `call'
rack (1.4.1) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context'
rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.1) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `_run__471556791__call__937320005__callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.1) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.1) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.1) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.1) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.1) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.1) lib/rack/lock.rb:15:in `call'
actionpack (3.2.1) lib/action_dispatch/middleware/static.rb:53:in `call'
railties (3.2.1) lib/rails/engine.rb:479:in `call'
railties (3.2.1) lib/rails/application.rb:220:in `call'
rack (1.4.1) lib/rack/content_length.rb:14:in `call'
railties (3.2.1) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service'
/home/eins11/.rbenv/versions/1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
/home/eins11/.rbenv/versions/1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
/home/eins11/.rbenv/versions/1.9.2-p290/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'
Rendered /home/eins11/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/templates/rescues/_trace.erb (5.1ms)
Rendered /home/eins11/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.1ms)
Rendered /home/eins11/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1/gems/actionpack-3.2.1/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (9.8ms)
And I have no idea what the problem is...

Answer 1

Ah, I've found the solution.
I don't know exactly why the error happened but I had to change my application_controller.
In the application_controller I fetched all projects to #projects:
before_filter :getActiveProjects
protected
def getActiveProjects
#projects = Project.isactive.find(:all, :order => 'LOWER(name) asc')
end
That was confusing ActiveAdmin. After I changed that to
before_filter :getActiveProjects
protected
def getActiveProjects
#projects_all = Project.isactive.find(:all, :order => 'LOWER(name) asc')
end
and projects_controller index action to
def index
#projects = #projects_all
end
everything worked fine ;)

Answer 2

An easier solution is to just skip the filter in the particular active admin controller:
ActiveAdmin.register Project do
controller do
skip_before_filter :getActiveProjects
end
end

Answer 3

The active admin make special processing of #resource variables. Where resource is correponding class name passed to register method. So for code:
ActiveAdmin.register Project do
end
name of variable is
`#project`
We must not assign value to variable with such name. Also such varibles may be object of ActiveRecord::Relation class. And how #Oliver write the name like #projects_all is good choice. The using of skip_before_filter is solve the problem too.
One crafty thing need to check. The controller of resource may not have any filters. The controller of resource may not exists at all. What is the filter name to put to skip_before_filter? And where is such filters? The default application controller is used anyway. The filter may be installed at main application controller. The error message of this problem is not informative at all. So need to check application controller for installed filters too.