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copied!<p>Somehow the information is scattered in the cookbook <a href="http://symfony.com/doc/current/cookbook/form/form_collections.html" rel="nofollow">http://symfony.com/doc/current/cookbook/form/form_collections.html</a> under additional note section <em>Doctrine: Cascading Relations and saving the "Inverse" side</em>.</p> <p>This issue impress me so that I put some actual coding/research on it. :)<br> Here is what I found.</p> <p>In the <code>Entity\Branch</code>, tell doctrine to cascade its persist operation on metadata property and modify <code>setMetadata()</code> to set the current branch for each metadata going to be persisted.</p> <pre><code>/** * * @ORM\OneToMany(targetEntity="BranchMeta", mappedBy="branch", cascade={"persist"}) */ private $metadata; public function setMetadata(ArrayCollection $metadata) { foreach ($metadata as $m) { $m->setBranch($this); } $this->metadata = $metadata; } </code></pre> <p>In the <code>Form\BranchType</code>, add metadata field with the appropriate option, and of course set the default <code>data_class</code> to <code>Entity\Branch</code> (your <code>BranchType</code> above doesn't have this). In this Form Type, the <code>'by_reference' => false</code> option is important to ensure that the <code>setMetadata()</code> function is called during persist (<a href="http://symfony.com/doc/current/reference/forms/types/collection.html#by-reference" rel="nofollow">http://symfony.com/doc/current/reference/forms/types/collection.html#by-reference</a>).</p> <pre><code>public function buildForm(FormBuilderInterface $builder, array $options) { $builder->add('name'); $builder->add('metadata', 'collection', array( 'type' => new BranchMetaType(), 'allow_add' => true, 'by_reference' => false, )); } public function setDefaultOptions(OptionsResolverInterface $resolver) { $resolver->setDefaults( array( 'data_class' => 'Acme\Bundle\ConsysBundle\Entity\Branch' )); } </code></pre> <p>And, finally try adding some dummy branchmeta in the controller</p> <pre><code>public function newAction() { $entity = new Branch(); $branchmeta1 = new BranchMeta(); $branchmeta1->setMetaname('dummy meta name #1'); $branchmeta1->setMetavalue('dummy meta value #1'); $entity->getMetadata()->add($branchmeta1); $branchmeta2 = new BranchMeta(); $branchmeta2->setMetaname('dummy meta name #2'); $branchmeta2->setMetavalue('dummy meta value #2'); $entity->getMetadata()->add($branchmeta2); $form = $this->createForm(new BranchType(), $entity); return array( 'entity' => $entity, 'form' => $form->createView(), ); } </code></pre>

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