php - Combining 2 forms in symfony

Question

I have an entity Book which contains:

/**
 * @var DoctrineCommonCollectionsArrayCollection
 * @ORMOneToMany(targetEntity="ReviewrReviewsBundleEntityReview", mappedBy="bookID")
 */
protected $reviews;

Within the Review entity i have fields to represent:

userID
bookID
posted
comment

Within my BookType, I am trying to create the form which also includes the fields from the ReviewType form:

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->add('author')
        ->add('title')
        ->add('summary')
        ->add('reviews', ReviewType::class)
        ->add('submit', SubmitType::class);
}

However, i can't seem to get this working. im just trying to have a form which uses fields from the book entity and review entity in one.

I recieve this error:

The form's view data is expected to be an instance of class ReviewrReviewsBundleEntityReview, but is an instance of class DoctrineCommonCollectionsArrayCollection.

Does anyone know what im doing wrong?

UPDATE With the current answer, it finally displays something.. just a string "Reviews" rather than the fields from the ReviewType form (userID, bookID, posted and comment) as shown in the image below:

Why is it not displaying the fields?

Answer 1

Since your book has many reviews (not one), you must map review as a collection type, each entry of which would be of type Review

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->add('author')
        ->add('title')
        ->add('summary')
        ->add('reviews', CollectionType::class, array(
            'entry_type' => ReviewType::class
        ))
        ->add('submit', SubmitType::class);
}

See more details in documentation.