Rails - Mar 2012 - redirect_to not working as expected, sent to update instead of show

Hi,

This is my first post to this list, so apologies if anything is amiss.

After processing and AJAX PUT request to a custom method, I want to 
redirect_to the show method of another controller, but redirect_to is 
keeping the PUT verb, so I get sent to update instead.

Rails 3.2.2, ruby 1.9.3-p0

I have tasklists that have many tasks.
The tasks are a list, and after moving a task down in the list I want to 
redirect and show the parent tasklist:

Models:
class TaskList < ActiveRecord::Base
  has_many :tasks, :order => ''position asc'', :dependent
=> :destroy
end

class Task < ActiveRecord::Base
  belongs_to :task_list
end

Controllers:
class TaskListsController < ApplicationController
  def show
    @task_list = TaskList.find(params[:id], :include => [:tasks])
  end
end

class TasksController < ApplicationController
  def move_task_down
    @task = Task.find(params[:id])

    respond_to do |format|
      if @task.move_lower
        format.js { redirect_to @task.task_list, :notice => 
t(''task_lists.successfully_moved'') }
      else
        format.js { redirect_to @task.task_list, :alert => 
t(''task_lists.error_move_task'') }
      end
    end
  end
end

routes.rb:
resources :task_lists
put ''tasks/:id/move_down'' =>
''tasks#move_task_down'', :as =>
''move_task_down''

In the log:
Started PUT "/tasks/406137300/move_down" for 127.0.0.1 at 2012-03-20 
12:19:17
Processing by TasksController#move_task_down as JS
  Parameters: {"id"=>"406137300"}
......
Redirected to http://localhost:3000/task_lists/1007688486

Started PUT "/task_lists/1007688486" for 127.0.0.1 at 2012-03-20
12:19:17
Processing by TaskListsController#update as JS
  Parameters: {"id"=>"1007688486"}

As seen in the log above, the user is being properly redirected to 
/task_lists/xxxxxxx, but the verb is PUT instead of GET,
which routes to the update method of TaskListsController, instead of the 
show method, which is where I want to go...

what am I doing wrong?

Thanks,
Martin

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