Embedding a Single Object - php

Question

I am new to Symfony2.0. I am learning it from the site http://symfony.com/doc/2.0/book/index.html. I've gone through all the topics given in the site but i am not getting output for the topic 'Embedding a Single Object',which is included within the Topic of Forms (http://symfony.com/doc/2.0/book/forms.html). I wrote all the code as they have given for 'Embedding a Single Object' but it does not make an entry to the database. When i submit my form it gives me error i stated below. I can make an entry without using embedding object code.
Error : "Catchable Fatal Error: Argument 1 passed to Acme\TaskBundle\Entity\Task::setCategory() must be an instance of Acme\TaskBundle\Entity\Category, array given, called in /opt/lampp/htdocs/kau.symfony2.com/vendor/symfony/src/Symfony/Component/Form/Util/PropertyPath.php on line 347 and defined in /opt/lampp/htdocs/kau.symfony2.com/src/Acme/TaskBundle/Entity/Task.php line 52"
I searched a lot but could't find the solution.
FilePath: Acme/TaskBundle/Form/Type/TaskType.php
<?php
// src/Acme/TaskBundle/Form/Type/TaskType.php
namespace Acme\TaskBundle\Form\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;
class TaskType extends AbstractType
{
public function buildForm(FormBuilder $builder, array $options)
{
$builder->add('task', 'text', array('max_length' => 20));
$builder->add('address', 'textarea', array('required' => true, 'read_only' => false));
$builder->add('dueDate', 'date');
$builder->add('category', new CategoryType());
}
public function getName()
{
return 'task';
}
}
?>
FilePath : Acme/TaskBundle/Resources/Views/Default/new.html.twig
<form action="{{ path('AcmeTaskBundle_newpage') }}" method="post" {{ form_enctype(form) }} novalidate>
{{ form_errors(form) }}
<div>
{{ form_errors(form.task) }}
{{ form_label(form.task, 'Task Description', { 'label_attr': {'class': 'task_field' }}) }}
{{ form_widget(form.task, { 'attr': {'class': 'task_field'} }) }}
</div>
<div>
{{ form_errors(form.address) }}
{{ form_label(form.address) }}
{{ form_widget(form.address) }}
</div>
<div>
{{ form_errors(form.dueDate) }}
{{ form_label(form.dueDate) }}
{{ form_widget(form.dueDate) }}
</div>
<h3>Category</h3>
<div class="category">
{{ form_row(form.category.name) }}
</div>
{{ form_rest(form) }}
<input type="submit" />
</form>
FilePath: Acme/TaskBundle/Form/Type/CategoryType.php
<?php
namespace Acme\TaskBundle\Form\Type;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilder;
class CategoryType extends AbstractType
{
public function buildForm(FormBuilder $builder, array $options)
{
$builder->add('name','text');
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Acme\TaskBundle\Entity\Category',
));
}
public function getName()
{
return 'category';
}
}
?>

Answer 1

Can u show your code ? Coz that error telling u that u use array - when you should use instance of object of Category
// show /Acme/TaskBundle/Entity/Task.php plz :)
and try to change :
$builder->add('category', new CategoryType());
to
$builder->add('category', 'collection', array('type' => new CategoryType));