class User extends Model
{
public function setPasswordAttribute($password)
{
$this->attributes['password'] = bcrypt($password);
}
...
}
Above code does "bcrypting" each time password property is set.
$user = $users->first();
$user->password = 'white rabbit'; //laravel calls mutator on background
$user->save(); // password is bcrypted and one does not need to call bcrypt('white rabbit')