Graphql : Cannot return null for non-nullable field

[maikelohcfg]

Hello every one

I am using graphql and have some weird issue,

First some context about package version:

• api-platform/core: 2.5.7
• webonyx/graphql-php: 14.3.0

This is my models

`class Book {
/**
* @Orm\Id
* @Orm\Column(type="integer")
* @Orm\GeneratedValue(strategy="IDENTITY")
/
protected $id;
/*
* @Orm\Column(type="string")
/
protected $name;
/*
* @Orm\OneToMany(targetEntity="Comment", mappedBy="book", cascade={"all"}, orphanRemoval=true)
*/
protected $comments;
}

class Comment {
/**
* @Orm\Id
* @Orm\Column(type="integer")
* @Orm\GeneratedValue(strategy="IDENTITY")
/
protected $id;
/*
* @Orm\ManyToOne(targetEntity="Book", inversedBy="comments")
* @Orm\JoinColumn(name="book_id", referencedColumnName="id")
/
protected $book;
/*
* @Orm\ManyToOne(targetEntity="Customer")
* @Orm\JoinColumn(name="localizacion_id", referencedColumnName="id", onDelete="CASCADE")
/
protected $customer;
/*
* @Orm\Column(type="text")
*/
protected $comment;
}

class Customer {
/**
* @Orm\Id
* @Orm\Column(type="integer")
* @Orm\GeneratedValue(strategy="IDENTITY")
/
protected $id;
/*
* @Orm\Column(type="string")
*/
protected $name
}`

This is my graphql query:

{ books { edges { node { id _id name comments { edges { node { id _id customer { id name } } } } } } totalCount pageInfo { endCursor startCursor hasNextPage hasPreviousPage } } }

When a request from customer only id it work perfect and return proper IRI so the customer is not null at all, but when customer name is requested and exception is being raised with debug message: Cannot return null for non-nullable field "Customer.name"."

Any help will be welcome, thanks in advantage

[pourquoi]

I had the same issue but it was due to a custom normalizer unsetting the field in question.

[JE4GLE]

I have the same problem. All properties are null, except the id. I don't use a custom normalizer. It works when getting the entity directly. When querying it through a parent entity, the error occurs.

[develth]

Same here on Entity where i want to get the ManyToOne - the GraphQL Schema also looks good.
@JE4GLE check serialization group on Parent Context