setting Flash messages from model

Nothing new:

So my models are very heavy and granular on functionality.

Controller actions calls -> method in model -> in turn may calls more methods in other related or same model etc.

each of these methods in models return boolean for success or failure.

I want each model method to be responsible for setting the flash message also.

the following approach works, but it doesn't seem very neat.

//Somewhere in a model method:

public function savethisstuff($data) {

if($not_ok){          $this->error = __('My error message');          return false;      }      return true;  }

in my controller :

public function add(){      if(!$this->Modelname->savethisstuff($this->request->data)){
        $this->Session->setFlash($this->Modelname->error);      }  }

writing to the session directly also does not seem like a very good idea either, because models can be used in shells where there is no session.

what could be the best way? Or Am I totally missing the point of something?

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