TypeORM GraphQL nested query returns null - graphql

Question

I am trying to use a GraphQL nested query to get information about project a and customer. I can get the information about project but I am unable to get the customer info.
How do I properly get the nested information?
Project Model
import { Entity, BaseEntity, PrimaryGeneratedColumn, Column, ManyToOne} from "typeorm";
import { ObjectType, Field, ID } from "type-graphql";
import {Customer} from "./Customer";
#Entity('project')
#ObjectType()
export class Project extends BaseEntity {
#Field(() => ID)
#PrimaryGeneratedColumn()
id: number;
#Field(() => String)
#Column()
name: string;
#Field(() => String)
#Column()
short_name: string;
#Field(() => String)
#Column()
description: string;
#Field(() => Customer, { nullable: true })
#ManyToOne(type => Customer, customer => customer.projects)
customer: Customer;
}
User Model
import { Entity, BaseEntity, PrimaryGeneratedColumn, Column, OneToMany, JoinTable } from "typeorm";
import { ObjectType, Field, ID } from "type-graphql";
import {Project} from "./Project";
import {ProjectUser} from "./Project_handled_by_user";
#Entity('customer')
#ObjectType()
export class Customer extends BaseEntity {
#Field(() => ID)
#PrimaryGeneratedColumn()
id: number;
#Field(() => String)
#Column()
name: string;
#Field(() => String)
#Column()
short_name: string;
#Field(() => String)
#Column()
active: string;
#Field(() => [Project], { nullable: true })
#OneToMany(type => Project, project => project.customer)
projects: Project[];
}
Project Resolver
import { Resolver, Query, Mutation, Arg } from "type-graphql";
import { Project } from "../models/Project";
#Resolver()
export class ProjectResolver {
#Query(() => [Project])
projects() {
return Project.find();
}
#Query(() => Project)
project(#Arg("id") id: string) {
return Project.findOne({ where: { id } });
}
}
For example, my query is:
{
project(id: "1"){
id
name
customer{
id
name
}
}
}
The query returns:
{
"data": {
"project": {
"id": "1",
"name": "KFS 5.1",
"customer": null
}
}
}
Thanks for help