def instance_get(attribute)
      getter = :"#{self.name}_#{attribute}"
      self.instance.send(getter) if instance.respond_to?(getter)
    end
def instance_get(attribute)
      getter = :"#{self.name}_#{attribute}"
      self.instance.send(getter) if instance.respond_to?(getter)
    end
Helper function for getting instance variables.

 Usage:

 self.instance_get(size)