adding files not commited from previous commit

app/models/design.rb

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+class Design
+  include Mongoid::Document
+  include Mongoid::Timestamps
+
+  field :title
+  field :author
+  field :intro
+
+  field :version
+
+  validates_presence_of :title
+  validates_presence_of :author
+
+  mount_uploader :layout, DesignFileUploader
+
+  embeds_many :stylesheets
+  embeds_many :javascripts
+  embeds_many :images
+
+  after_update :destroy_attrs
+  
+  def javascripts=(*attrs)
+    self.attribute_models=(attrs<<'javascripts')
+  end
+
+  def stylesheets=(*attrs)
+    self.attribute_models=(attrs<<'stylesheets')
+  end
+
+  def images=(*attrs)
+    self.attribute_models=(attrs<<'images')
+  end
+
+  # Update or create the attribute_model records
+  def attribute_models=(attrs)
+      #attribute_models = eval(attributes[:type])
+     # if attributes.original_filename.blank?
+      attribute_models=eval(attrs.last)
+      a=attribute_models.build()
+      a.file=attrs[0]
+     # else
+     #   attribute_model = attribute_models.detect {|a| a.id.to_s == attributes[:id].to_s }
+     #   attribute_model.update_attributes(attributes)
+    #end
+  end
+
+  def is_built_in?
+    self.built_in
+  end
+  
+  def is_disabled?
+    self.disabled
+  end
+  
+  def get_enabled_attribute_models
+    self.attribute_models.excludes('disabled' => true)
+  end
+  
+  protected
+  
+  # Destroy the i18n_variable for each attribute_models if marked to destroy
+  def destroy_attrs
+=begin
+    attribute_models.each do |a|
+      if a.should_destroy?
+         a.destroy_i18n_variable
+      end
+    end
+=end
+  end
+end

app/models/design_file.rb

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+class DesignFile
+  include Mongoid::Document
+
+  mount_uploader :file, AssetUploader
+
+end

app/models/image.rb

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+class Image<DesignFile
+
+end

app/models/javascript.rb

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+class Javascript<DesignFile
+
+end

app/models/stylesheet.rb

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+class Stylesheet < DesignFile
+  mount_uploader :file, AssetUploader
+
+  embedded_in :design
+end