Record editing and passing id to form

If you want to edit a record, you have to pass its id to save function. You can use $form->addHidden() though, but often it's better to use an action parameter.

Most important is fact, that permissions to edit the record have to be check both in the action and the signal. Record submit is signal as well (accessible by url).

use Nette\Application\UI\Form;
use Nette\Application\BadRequestException;
use Nette\Application\ForbiddenRequestException;

class RecordPresenter extends BasePresenter
{
    /** @var object */
    private $record;

    /**
     * Edit record
     */
    public function actionEdit($id = 0)
    {
        // fetch record from database
        $this->record = $this->model->records->fetch($id);

        if (!$this->record) { // check if record exits
            throw new BadRequestException;

        } elseif ($this->record->userId != $this->user->id) { // check permissions to edit
            throw new ForbiddenRequestException;
        }

        $this['recordForm']->setDefaults($this->record); // set up default values
    }

    /**
     * Form to edit record
     */
    protected function createComponentRecordForm()
    {
        $form = new Form;
        $form->addText('myValue', 'Name:', 20, 60);
        $form->addSubmit('send', 'Send');
        $form->onSuccess[] = [$this, 'recordUpdate'];
        return $form;
    }

    /**
     * Record update
     * @form recordForm
     */
    public function recordUpdate(Form $form)
    {
        if (!$this->record) { // check if the record exists
            throw new BadRequestException;
        }

        $values = $form->getValues();
        $this->model->records->update($this->record->id, $values);

        $this->flashMessage('Record updated!', 'success');
        $this->redirect('edit');
    }
}

Next step could be creating separate function for checking both record existence and rights.

Save & update form in one

In other word one form for multiple actions.

/**
 * Form to manage record
 */
protected function createComponentRecordForm()
{
    // ...
    $form->onSuccess[] = [$this, 'processRecordForm'];
    // ...
}

/**
 * Record process
 * @form recordForm
 */
public function processRecordForm(Form $form)
{
    if ((int) $this->getParameter('id') && !$this->record) { // check if the record exists only while being edited
        throw new BadRequestException;
    }

    $values = $form->getValues();

    if($this->record) { // we're editing record
        $this->model->records->update($this->record->id, $values);
        $this->flashMessage('Record updated!', 'success');
        $this->redirect('edit');
    } else { // we're adding new record
        $this->model->records->insert($values);
        $this->flashMessage('Record created!', 'success');
        $this->redirect('default');
    }
}