avoid errors when binding empty propel collection to a symfony2 form

PropelCollectionType.php

<?php
        $callback = function($data = null) {
            if (empty($data)) {
                return new \PropelObjectCollection();
            }

            return $data;
        };
        $builder
            ->appendClientTransformer(new CallbackTransformer($callback, $callback));
        ;

hm can you explain me a bit more ?

yep sorry for the loosy feedback :)

I have a FiscalPeriod object that has many municipalities. (one to many)
I have symfony form that maps the fiscal_period.municipalities as a 'collection' type. ( by_reference = false, delete = true, add = true).

When I empty the municipalities collection( eg: en empty array in the request), the form dataMapper tries to call FiscalPeriod::setMunicipalities(array()); ( with an array),
which results in a fatal error, because setMunicipalities waits for a PropelObjectColelction.

By adding a dataTransformer that transforms empty array to PropelCollection, I avoid the error.

ok, so there is no problem here, right ?

no problem anymore. I think it could be useful to either provide this dataTransformer in a PropelCollection type or describe the problem here: http://www.propelorm.org/cookbook/symfony2/mastering-symfony2-forms-with-propel.html

Actually, I never got this issue.. Envoyé de mon iPhone Le 20 déc. 2011 à 08:47, Klein [email protected] a écrit :

…

no problem **anymore**. I think it could be useful to either provide this dataTransformer in a PropelCollection type or describe the problem here: http://www.propelorm.org/cookbook/symfony2/mastering-symfony2-forms-with-propel.html --- Reply to this email directly or view it on GitHub: https://gist.github.com/1497965

interesting, I've maybe done something wrong. I'l try to dig into that.