Create FileAssetUploader

app/models/asset.rb

@@ -3,7 +3,7 @@ class Asset
   include Mongoid::Document
   include Mongoid::Timestamps
 
-  mount_uploader :data, AssetUploader
+  mount_uploader :data, FileAssetUploader
 
   field :filename
   field :description

app/uploaders/asset_uploader.rb

@@ -48,8 +48,8 @@ class AssetUploader < CarrierWave::Uploader::Base
   # end
 
   # Override the filename of the uploaded files:
-  def filename
+  # def filename
-    model.filename
+  #   model.filename
-  end
+  # end
 
 end

app/uploaders/file_asset.rb

@@ -0,0 +1,55 @@
+# encoding: utf-8
+
+class FileAssetUploader < CarrierWave::Uploader::Base
+  require 'mime/types'
+  
+  process :set_content_type
+
+  def set_content_type(*args)
+    content_type = file.content_type == ('binary/octet-stream' || 'application/octet-stream') || file.content_type.blank? ? MIME::Types.type_for(original_filename).first.to_s : file.content_type
+    self.file.instance_variable_set(:@content_type, content_type)
+  end
+
+  # Include RMagick or ImageScience support:
+  # include CarrierWave::RMagick
+  # include CarrierWave::ImageScience
+
+  # Choose what kind of storage to use for this uploader:
+  # storage :file
+  # storage :s3
+
+  # Override the directory where uploaded files will be stored.
+  # This is a sensible default for uploaders that are meant to be mounted:
+  def store_dir
+    "assets/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
+  end
+
+  # Provide a default URL as a default if there hasn't been a file uploaded:
+  # def default_url
+  #   "/images/fallback/" + [version_name, "default.png"].compact.join('_')
+  # end
+
+  # Process files as they are uploaded:
+  # process :scale => [200, 300]
+  #
+  # def scale(width, height)
+  #   # do something
+  # end
+
+  # Create different versions of your uploaded files:
+  # version :thumb do
+  #   process :scale => [50, 50]
+  # end
+
+  # Add a white list of extensions which are allowed to be uploaded.
+  # For images you might use something like this:
+  # def extension_white_list
+  #   %w(jpg jpeg gif png)
+  # end
+
+  # Override the filename of the uploaded files:
+  def filename
+    model.filename
+  end
+
+end