phalcon MVC Model

Question

I had a problem with the mvc model updating a row. The task was: in table table_name set column_name = column_name + 1

If i would use the model like

model->find(...)    
model->column_name = model->column_name + 1
model->save

then another script could have updated the column in the mean time:

model->find(...)    
model->column_name = model->column_name + 1 // lets say loaded 9 and set to 10
// at this point another script may just loaded the old value 9
// and saved it to n.
// my current model would save to to 10 which would be wrong
model->save

To prevent that Im using the server:

$result = $this->getWriteConnection()->query(
    "UPDATE `table_name` SET 
                  `column_name` = @new_value := `column_name` + 1 
                  WHERE ...;"
);

I then select the @new_value session var on another call.

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What Im searching now is a way to do that with the mvc model. Any way to do that?