Merge pull request #256 from openstax/exercise-attachment-saving

Exercise attachment saving

Author: nathanstitt

app/uploaders/asset_uploader.rb

@@ -51,7 +51,7 @@ def mime_type(file)
     when CarrierWave::SanitizedFile
       file.to_file
     when CarrierWave::Storage::Fog::File
-      CarrierWave::Storage::Fog.new(self).retrieve!(File.basename(file.path))
+      file.read
     else
       open(file)
     end

lib/has_attachments.rb

@@ -3,7 +3,7 @@ module ActiveRecord
     module Base
       def has_attachments
         class_exec do
-          has_many :attachments, as: :parent, dependent: :destroy, inverse_of: :parent, validate: false
+          has_many :attachments, as: :parent, dependent: :destroy, inverse_of: :parent
         end
       end
     end