Since adding the plugin have you restarted the server process?  New gems, 
plugins and config/ changes aren't loaded on the fly.

On Sunday, October 14, 2012 6:51:49 AM UTC-6, moreaki wrote:
>
> G'day
>
> Prolog: In a spare hour of my life I had decided to dive into the 
> Ruby/Rails/Hobo world and just check out the inspiring agility tutorial. 
> After all, I had all the requirements installed on my Mac OS X 10.6.8, and 
> so I would just need to follow easy to grasp instructions. And boy, was I 
> in for a surprise! Being more of a kernel developer as my background, I 
> haven't done any sorts web application development probably since 1999 (if 
> you could call it that back then); and it was done mostly in C, shell and 
> Perl. After one hour joyfully following the easy instructions (without 
> really understanding at depth what I was changing from step to step), I had 
> pretty much a working web app which would have probably cost me days if not 
> weeks to develop using my antiquated (or rather inadequate) technology 
> stack. But I got stuck in the process of adding "Task re-ordering".
>
> Problem description: Let me just dump my session here, without further ado:
>
> $ rails plugin install git://github.com/swanandp/acts_as_list.git
> Initialized empty Git repository in 
> /Users/moreaki/Work/OpenSource/webapps/hobo/agility/vendor/plugins/acts_as_list/.git/
> remote: Counting objects: 45, done.
> remote: Compressing objects: 100% (36/36), done.
> remote: Total 45 (delta 13), reused 22 (delta 1)
> Unpacking objects: 100% (45/45), done.
> From git://github.com/swanandp/acts_as_list
>  * branch            HEAD       -> FETCH_HEAD
> $ vi app/models/story.rb 
> $ vi app/models/task.rb 
> $ git diff
> diff --git a/app/models/story.rb b/app/models/story.rb
> index ee47f9c..6b6cb02 100644
> --- a/app/models/story.rb
> +++ b/app/models/story.rb
> @@ -11,7 +11,7 @@ class Story < ActiveRecord::Base
>    belongs_to :project
>    belongs_to :status, :class_name => "StoryStatus"
>  
> -  has_many :tasks, :dependent => :destroy
> +  has_many :tasks, :dependent => :destroy, :order => :position
>  
>    children :tasks
>  
> diff --git a/app/models/task.rb b/app/models/task.rb
> index 90f7418..76320a6 100644
> --- a/app/models/task.rb
> +++ b/app/models/task.rb
> @@ -12,6 +12,8 @@ class Task < ActiveRecord::Base
>    has_many :task_assignments, :dependent => :destroy
>    has_many :users, :through => :task_assignments, :accessible => true, 
> :dependent => :destroy
>  
> +  acts_as_list :scope => :story
> +
>    # --- Permissions --- #
>  
>    def create_permitted?
> $ hobo generate migration
> Hobo Command Line Interface 1.3.2
>
> ---------- Up Migration ----------
> add_column :tasks, :position, :integer
> ----------------------------------
>
> ---------- Down Migration --------
> remove_column :tasks, :position
> ----------------------------------
>
> What now: [g]enerate migration, generate and [m]igrate now or [c]ancel? m
>   => "m"
>
> Migration filename: [<enter>=hobo_migration_1|<custom_name>]: 
> install_acts_as_list
>   => "install_acts_as_list"
>       create  db/migrate/20121014124445_install_acts_as_list.rb
>         rake  db:migrate
> ==  InstallActsAsList: migrating 
> ==============================================
> -- add_column(:tasks, :position, :integer)
>    -> 0.0018s
> ==  InstallActsAsList: migrated (0.0019s) 
> =====================================
> $ vi app/views/taglibs/application.dryml 
> $ vi app/views/tasks/edit.dryml
> $ git diff
> diff --git a/app/models/story.rb b/app/models/story.rb
> index ee47f9c..6b6cb02 100644
> --- a/app/models/story.rb
> +++ b/app/models/story.rb
> @@ -11,7 +11,7 @@ class Story < ActiveRecord::Base
>    belongs_to :project
>    belongs_to :status, :class_name => "StoryStatus"
>  
> -  has_many :tasks, :dependent => :destroy
> +  has_many :tasks, :dependent => :destroy, :order => :position
>  
>    children :tasks
>  
> diff --git a/app/models/task.rb b/app/models/task.rb
> index 90f7418..76320a6 100644
> --- a/app/models/task.rb
> +++ b/app/models/task.rb
> @@ -12,6 +12,8 @@ class Task < ActiveRecord::Base
>    has_many :task_assignments, :dependent => :destroy
>    has_many :users, :through => :task_assignments, :accessible => true, 
> :dependent => :destroy
>  
> +  acts_as_list :scope => :story
> +
>    # --- Permissions --- #
>  
>    def create_permitted?
> diff --git a/app/views/taglibs/application.dryml 
> b/app/views/taglibs/application.dryml
> index c7bcf07..27537ee 100644
> --- a/app/views/taglibs/application.dryml
> +++ b/app/views/taglibs/application.dryml
> @@ -18,6 +18,12 @@
>    </old-card>
>  </extend>
>  
> +<extend tag="form" for="Task">
> +  <old-form merge>
> +    <field-list: fields="description, users"/>
> +  </old-form>
> +</extend>
> +
>  <extend tag="page">
>    <old-page merge>
>      <footer:>
> diff --git a/db/schema.rb b/db/schema.rb
> index fe91e1a..840fb60 100644
> --- a/db/schema.rb
> +++ b/db/schema.rb
> @@ -10,7 +10,7 @@
>  #
>  # It's strongly recommended to check this file into your version control 
> system.
>  
> -ActiveRecord::Schema.define(:version => 20121013223931) do
> +ActiveRecord::Schema.define(:version => 20121014124445) do
>  
>    create_table "projects", :force => true do |t|
>      t.string   "name"
> @@ -51,6 +51,7 @@ ActiveRecord::Schema.define(:version => 20121013223931) 
> do
>      t.datetime "created_at"
>      t.datetime "updated_at"
>      t.integer  "story_id"
> +    t.integer  "position"
>    end
>  
>    add_index "tasks", ["story_id"], :name => "index_tasks_on_story_id"
>
> And that's where things go havoc. Upon requesting the "projects" page in 
> my browser, rails barks at me with the following wonderful error message:
>
> Started GET "/projects" for 127.0.0.1 at Sun Oct 14 14:47:28 +0200 2012
>   SQL (0.6ms)   SELECT name
>  FROM sqlite_master
>  WHERE type = 'table' AND NOT name = 'sqlite_sequence'
>
>
> NoMethodError (undefined method `acts_as_list' for #<Class:0x107869db0>):
>   app/models/task.rb:15
>   app/controllers/tasks_controller.rb:5
>
> Rendered 
> /Users/moreaki/.gem/ruby/1.8/gems/actionpack-3.0.17/lib/action_dispatch/middleware/templates/rescues/_trace.erb
>  
> (1.2ms)
> Rendered 
> /Users/moreaki/.gem/ruby/1.8/gems/actionpack-3.0.17/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb
>  
> (1.4ms)
> Rendered 
> /Users/moreaki/.gem/ruby/1.8/gems/actionpack-3.0.17/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb
>  
> within rescues/layout (7.7ms)
>
> Would anyone be willing to spare some precious minutes of his life to 
> offer me a solution (and if willing, an explanation) to my current 
> challenge?
>
> Cheers and best regards
>
>
>
>

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