Pfthb

I am working on Sylius 1.2.8. I have overridden Product model and it is working fine but when I add a new product with attributes:

<?php
...

$em = $this->container->get('sylius.manager.product');

/**
* @var SyliusComponentProductModelProductAttributeValueInterface $attribute
* @var SyliusComponentCoreModelProductInterface $product 
*/

$product->addAttribute($attribute);
$em->persist($product);
$em->flush();

It throws this error:

An exception occurred while executing 'INSERT INTO
sylius_product_attribute_value (locale_code, text_value,
boolean_value, integer_value, float_value, datetime_value, date_value,
json_value, product_id, attribute_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?,
?, ?)' with params ["en_US", null, null, null, null, null, null,
"["013ea12a-1aff-4050-8107-20b53ada73ce"]", null, 28]:

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'product_id' cannot be null

My custom Product Model looks like this:

namespace AppBundleEntity;

use DoctrineCommonCollectionsArrayCollection;
use SyliusComponentCoreModelProduct as BaseProduct;

class Product extends BaseProduct implements ProductInterface

 public function __construct()
 
 parent::__construct();
 

And my config file:

sylius_product:
 driver: doctrine/orm
 resources:
 product:
 classes:
 repository: AppBundleDoctrineORMProductRepository
 model: AppBundleEntityProduct

I have found a similar question asked :stackoverflow.com/q/22919004/6248367. But this does not solve my problem neither does it answer why application fails. This answer is also 4 years old. Can someone help me fix this?

Edit: This error is also thrown in admin whenever I create a new product and add attributes to it at the same time. Workaround is to first create product, then add attributes.

I have figured out the problem. As @czende mentioned properly check the configuration.

In my case I had set the wrong class in subject while overriding the attribute:

sylius_product:
 driver: doctrine/orm
 resources:
 product:
 classes:
 repository: AppBundleDoctrineORMProductRepository
 model: AppBundleEntityProduct

sylius_attribute:
 driver: doctrine/orm
 resources:
 product:
 # Make sure to provide the correct Product class in the subject.
 subject: AppBundleEntityProduct 
 attribute:
 classes:
 model: AppBundleEntityProductAttribute
 repository: AppBundleDoctrineORMProductAttributeRepository

Also make sure to use mappedSuperclass in the mapping config instead of entity as commented by Michał Marcinkowski in issue #3997

AppBundleEntityProductAttribute:
 type: mappedSuperclass
 table: sylius_product_attribute

EDIT: To debug what's wrong, start by checking warnings in symfony debug bar. It can narrow down your search area for bug. I can also hint you if something is wrong in your configuration file.