Add asset model and controller

app/models/asset.rb

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+class Asset
+
+  include MongoMapper::Document
+  include Grip::HasAttachment
+
+  key :filename, String, :required => true
+  key :description, String
+
+  has_grid_attachment :data, :required => true
+  
+  before_validation :setup_filename
+  
+  protected
+  
+  def setup_filename
+    if self.filename.blank? && self.data
+      self.filename = self.data.file_name
+    end
+  end
+  
+end

app/models/assets/asset_image.rb

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+class AssetImage < Asset
+
+end

app/models/assets/asset_javascript.rb

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+class AssetJavascript < Asset
+
+end

app/models/assets/asset_pdf.rb

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+class AssetPdf < Asset
+end

app/models/assets/asset_stylesheet.rb

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+class AssetStylesheet < Asset
+
+end