gistfile1.rb

def update
 @list = List.find(params[:id])
 if(@list.position > params[:list][:position].to_i)
   List.find(:all, :conditions => ["position >= ? AND position < ?", params[:list][:position],@list.position]).each {|c| c.update_attribute(:position, c.position + 1)}
 else
   List.find(:all, :conditions => ["position <= ? AND position > ?", params[:list][:position],@list.position]).each {|c| c.update_attribute(:position, c.position - 1)}
endif
@list.update_attributes(params[:list])
redirect_to :action => 'list'
else
redirect_to :action => 'edit', :id => params[:id]
end
end

def create
  @list = List.new(params[:list])
  if @list.save and @list.insert_at(params[:list][:position])
    flash[:notice] = 'List was successfully created.'
    redirect_to :action => 'list'
  else
    render :action => 'new'
end
end

def update_positions
  params[:sortable_list].each_with_index do |id, position|
    List.update(id, :position => position+1)
  end

  @lists = List.find(:all, :order => :position )
  render :layout => false , :action => :reorder
end

def reorder
 @lists = List.find(:all, :order => :position )
end