def hbs_attributes
      s = self.class.class_variable_get(:@@serialize)
      if s[:merge]
        attrs = s[:attrs] + self.attributes.keys
      else
        attrs = s[:attrs]
      end
      attrs.collect{|attr| attr.to_sym}.uniq
    end
def hbs_attributes
      s = self.class.class_variable_get(:@@serialize)
      if s[:merge]
        attrs = s[:attrs] + self.attributes.keys
      else
        attrs = s[:attrs]
      end
      attrs.collect{|attr| attr.to_sym}.uniq
    end
List of Model attributes that should be serialized when called `to_hbs` on Model instance
 @return [Array] list of serializable attributes