remove orientdb concern

app/models/concerns/orient_db_serializable.rb

-module OrientDbSerializable
-  extend ActiveSupport::Concern
-  include OrientDb::Methods::SanitizableMethods
-
-  def to_orientdb_hash
-    hash = {'@class' => self.class.to_s}
-    self.instance_variables.each do |var|
-      var_name = sanitize_orientdb_vars(var)
-      hash[var_name] = sanitize_orientdb_values(self.instance_variable_get(var))
-    end
-    delete_unused_vars hash
-  end
-
-  def excluded_orientdb_properties
-    []
-  end
-
-  private
-
-  def delete_unused_vars(hash)
-    delete_vars_from_hash ['id', 'validation_context', 'errors'], hash
-    delete_vars_from_hash excluded_orientdb_properties, hash
-    hash
-  end
-
-  def delete_vars_from_hash(vars=[], hash)
-    vars.each { |property| hash.delete(property.to_s) }
-  end
-
-end
\ No newline at end of file