Symfony 5.1 nested forms with ArrayCollection - php

Question

I have an employee entity, a society entity and a site entity,
A society can have several sites (OneToMany),
The employee has a form. Inside, we have the choice of society.
I would like to nest the Site FormType in that of society.
So when I choose a society under EmployeeForm, it only suggests sites linked to society.
Hope I am clear. I followed the symfony documentation on how to embed an ArrayCollection.
https://symfony.com/doc/5.1/form/form_collections.html
and I looked https://symfony.com/doc/current/form/data_transformers.html
I'm not sure which is the best approach ?
I still get the error
The object of class Doctrine\ORM\PersistentCollection could not be
converted to a string
and I am unable in SocietyForm to isolate the "name" attribute of each Site. I don't want a collection, but a list of name (string).
EmployeeType
class EmployeeType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name', NULL, [
'label' => 'Nom',
])
->add('firstname', NULL, [
'label' => 'Prénom',
])
->add('societe', EntityType::class, [
'label' => 'Société',
'class' => RefSociety::class,
'choice_label' => 'Name',
])
->add('site', EntityType::class, [
'label' => 'Site',
'class' => RefSociety::class,
'choice_label' => 'refSites'
])
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => Employee::class,
]);
}
}
RefSocietyType
class RefSocietyType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('Name', NULL, [
'label' => 'Nom de société'
])
->add('refSites', CollectionType::class, array(
'type' => RefSiteType::class,
'allow_add' => true,
'allow_delete' => true,
'prototype' => true,
'by_reference' => false,
))
->add('Adress', NULL, [
'label' => 'Adresse'
])
->add('PostalCode', NULL, [
'label' => 'Code postal'
])
->add('Country', NULL, [
'label' => 'Pays'
])
->add('City', NULL, [
'label' => 'Ville'
])
->add('save', SubmitType::class, [
'attr' => ['class' => 'btn btn-primary btn-block btn-radius'],
'label' => 'Sauvegarder'
])
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => RefSociety::class,
]);
}
}
RefSiteType
class RefSiteType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name')
;
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults([
'data_class' => RefSite::class,
]);
}
}
index.html.twig
{ form_start(employeeForm) }}
{{form_row(employeeForm.name, {'attr' : {'class' : ""} }) }}
{{form_row(employeeForm.firstname, {'attr' : {'class' : ""} }) }}
{{form_row(employeeForm.societe) }}
<ul class="sites">
{% for site in employeeForm.refSites %}
<li>{{ form_row(site.name) }}</li>
{% endfor %}
</ul>
{{ form_end(employeeForm) }}

Answer 1

->add('site', EntityType::class, [
'label' => 'Site',
'class' => RefSociety::class,
'choice_label' => 'refSites'
])
'choice_label' => 'refSites' means that the method getRefSites() are called by PropertyAccessor to get a label name, so the method getRefSites returns the collection (because one to many), but the label must be a string.
Maybe should you use 'choice_label' => 'name' ?