def subclass_with_constantize
      self.subclass = parent_module.const_get camelize(self.subclass_without_constantize) unless !self.subclass_without_constantize || self.subclass_without_constantize.is_a?(Class)
      subclass_without_constantize
    end
def subclass_with_constantize
      self.subclass = parent_module.const_get camelize(self.subclass_without_constantize) unless !self.subclass_without_constantize || self.subclass_without_constantize.is_a?(Class)
      subclass_without_constantize
    end
Alias method chain to instantiate the subclass from a symbol should it not be a class
 @return [NilClass, Class] The subclass or nil