Undefined method "reorder" for #<Array:0xbc38600> using ActiveAdmin

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)
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  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'
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  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'
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  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'
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  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'
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  inherited_resources (1.3.0) lib/inherited_resources/actions.rb:7:in `index'
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  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'
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  actionpack (3.2.1) lib/abstract_controller/callbacks.rb:17:in `process_action'
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  /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