Update a model’s attribute by another cakephp’s controller

Question

[SOLVED] I have a business logic as follows, when the user changes an attribute to paid (change from 0 to 1) I need him to update the balance value of another model.

when the user changes the status of the paid installment that belongs to the installments table I want to change the value of the balance that is within the contract table

schema: contract 1 - n installments

Answer 1

I got it with that code:

        $this->Iten->Contrato->id=$id;
        $this->Iten->Contrato->saveField("valorTotal",$novoValor);