implemented simple sorting behaviour for attachments in model layer

- position column, fill existing positions from creation order
- depend on acts_as_list gem

app/models/attachment.rb

@@ -1,7 +1,11 @@
+require 'acts_as_list'
+
 class Attachment < ActiveRecord::Base
   belongs_to :asset, :autosave => true
   belongs_to :page
 
+  acts_as_list :scope => :page_id
+
   def uploads=(new_uploads)
     (asset || build_asset).uploads=new_uploads
   end

assets_extension.rb

@@ -33,7 +33,7 @@ def activate
     ApplicationController.helper(:assets)
     Page.class_eval do
       include AssetTags
-      has_many :attachments, :include => :asset
+      has_many :attachments, :include => :asset, :order => :position
     end
   end
 end

db/migrate/20110320152044_add_position_to_attachments.rb

@@ -0,0 +1,14 @@
+class AddPositionToAttachments < ActiveRecord::Migration
+  def self.up
+    add_column :attachments, :position, :integer
+    Page.all(:include => :attachments).each do |page|
+      page.attachments.each_with_index do |attachment, index|
+        attachment.update_attributes :position => index+1
+      end
+    end
+  end
+
+  def self.down
+    remove_column :attachments, :position
+  end
+end

lib/radiant-assets-extension/version.rb

@@ -1,3 +1,3 @@
 module RadiantAssetsExtension
-  VERSION = '0.0.6'
+  VERSION = '0.0.7'
 end

radiant-assets-extension.gemspec

@@ -14,6 +14,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'dragonfly', '~>0.8.2'
   s.add_dependency 'aws-s3', '~>0.6.2'
+  s.add_dependency 'acts_as_list', '~>0.1.2'
 
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")