Symfony2 Property Path Parse Error on "collection" Form

Question

I have been trying to figure this out for over an hour and I have made no progress...

I have the following form and its the only field:

<?php
$builder
        ->add('cars', 'collection', array(
            'type' => new CarType(),
            //'property_path' => '[cars]',
            'required' => false,
        ))
    ;

This form receives an array, with one key "cars" pointing to an array of Car objects (which are handled fine by the CarType().

When I set data to this form, it gives me a Property Path parse error, stating that the property path "[]" is invalid and cant be parsed. Note that if I uncomment the property_path option above it is the same error (I just put that there to show its the default).

Why is it using a property path of []?
How can I fix this?

NOTE: This works fine in one enviornment with PHP 5.4 and fails on all my PHP 5.3 environments.

Thanks for any help.

More information:

Exception: "Could not parse property path "[]". Unexpected token "[" at position 0"

in /vagrant/vendor/symfony/symfony/src/Symfony/Component/PropertyAccess/PropertyPath.php at line 125

please add the entity holding the cars , property, getter/setter to the question. aswell as your CarType form — Nicolai Fröhlich
– Nicolai Fröhlich, Commented Jun 26, 2013 at 20:00

Ian Phillips · Accepted Answer · 2013-08-08 18:32:02Z

3

I had a similar problem, and found this workaround, which I'll adapt to your example:

I was using the form to create some new Car objects, so my cars didn't have IDs. My Car->getId() method returned null. When I changed the getId() method to this:

public function getId() {
    return (int) $this->id;
}

the problem went away, because now getId() is returning 0. Presumably the property path [0] is valid, but [] is not.

answered Aug 8, 2013 at 18:32

Ian Phillips

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Comments

Nicolai Fröhlich · Accepted Answer · 2013-06-26 20:09:31Z

1

Your return value of the getCars() should normally not be of type array but of type Doctrine\Common\Collections\ArrayCollection.

property_path specifies the property which shall be used by the form to get/set the values back to the underlying object.

if your field-name is 'cars' it will already default to 'cars'.

Please note that you don't have to wrap the property_path's value in [] ...

PHP 5.3 does not support the short array syntax [] which has been added in PHP 5.4.

For backward compatibility you have to use array() syntax.

edited Jun 26, 2013 at 20:09

answered Jun 26, 2013 at 19:52

Nicolai Fröhlich

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4 Comments

Chris Tickner Over a year ago

I don't believe anywhere in my code I am using the [] array syntax. This seems to be an error thrown by an invalid "[]" property_path in the form component.

Nicolai Fröhlich Over a year ago

you don't have to wrap the property_path in [] ... and it defaults to the field-name ... you don't need it in your case

Chris Tickner Over a year ago

I have commented it out just to show that it will default to what is in the comment. I still get the same error with that commented out.

Nicolai Fröhlich Over a year ago

jeah i got that - but the commented out value includes [] aswell, which is wrong.

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