Get old record in beforeSave when updating (doing a $this->find() inside beforeSave callback)

When updating a row, I wish to read the "old" data before saving the current record.

Here's a simplified example:

Controller code:

$this->User->save(['id' => 3, 'username' => 'a-new-username']);

Model code:

class User extends AppModel {

   public function beforeSave($options){

       //is it an update?

       if (isset($this->data[$this->alias][$this->primaryKey])) {
            //read record

            $oldData = $this->findById($this->data[$this->alias][$this->primaryKey]);
              //^^^ here's the problem! ^^^

            if ($oldData[$this->alias]['username_update_count'] >= 3){

               return false;

            }

            else {

              $this->data[$this->alias]['username_update_count'] = $oldData[$this->alias]['username_update_count'] + 1;

            }

       }

   }

}

The problem is, that $this->findById (or any other READ operation) fills the current $this->data with the read data, which ruins the current update. So my gut tells me to instantiate a new User model inside the beforeSave (not optimal) or to somehow use the DataSource directly without all the callbacks and Model instantiation.

The real scenario really has to be inside the beforeSave callback, because the logic is required for every modification.

Thanks!

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