Perfect ORM Definitions
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<?php
use Doctrine\ORM\Mapping as ORM;

#[ORM\Entity]
#[ORM\Table(name: "ecommerce_order", options: ["charset"=>"utf8","collate"=>"utf8_unicode_ci"])]
#[ORM\ChangeTrackingPolicy("DEFERRED_IMPLICIT")]
class EcommerceOrder
{
    #[ORM\Id]
    #[ORM\Column(type: "integer")]
    #[ORM\GeneratedValue(strategy: "AUTO")]
    private $id;

    #[ORM\Column(type: "timestamp", length: 255, nullable: true)]
    private $ordered_at;

    #[ORM\Column(type: "string", nullable: true)]
    private $customer_note;

    #[ORM\Column(type: "string", nullable: true)]
    private $internal_note;

    #[ORM\OneToOne(targetEntity: "Address", inversedBy: "EcommerceOrders")]
    #[ORM\JoinColumn(name: "billing_address_id", referencedColumnName: "id", unique: true)]
    private $BillingAddress;

    #[ORM\OneToOne(targetEntity: "Address", inversedBy: "EcommerceOrdersDelivery")]
    #[ORM\JoinColumn(name: "delivery_address_id", referencedColumnName: "id", unique: true)]
    private $DeliveryAddress;
}

<?php
use Doctrine\ORM\Mapping AS ORM;

/**
 * @ORM\Entity
 * @ORM\Table(schema="ecommerce_order", options={"charset":"utf8","collate":"utf8_unicode_ci"})
 * @ORM\ChangeTrackingPolicy("DEFERRED_IMPLICIT")
 */
class EcommerceOrder
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer", length=4, options={"unsigned":true})
     * @ORM\GeneratedValue(strategy="SEQUENCE")
     */
    private $id;

    /**
     * @ORM\Column(type="timestamp", nullable=true)
     */
    private $ordered_at;

    /**
     * @ORM\Column(type="string", nullable=true)
     */
    private $customer_note;

    /**
     * @ORM\Column(type="string", nullable=true)
     */
    private $internal_note;

    /**
     * @ORM\OneToOne(targetEntity="Address")
     * @ORM\JoinColumn(name="billing_address_id", referencedColumnName="id", unique=true)
     */
    private $BillingAddress;

    /**
     * @ORM\ManyToOne(targetEntity="Address")
     * @ORM\JoinColumn(name="delivery_address_id", referencedColumnName="id")
     */
    private $DeliveryAddress;
}

<?xml version="1.0"?>
<doctrine-mapping
 xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
 xsi="http://www.w3.org/2001/XMLSchema-instance"
 schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
  <entity
   name="EcommerceOrder"
   change-tracking-policy="DEFERRED_IMPLICIT"
   schema="ecommerce_order"
   repository-class="Doctrine\ORM\EntityRepository">
    <id name="id" type="integer" length="4">
      <generator strategy="SEQUENCE"/>
      <options>
        <option name="unsigned" value="true"/>
      </options>
    </id>
    <field name="ordered_at" type="timestamp" nullable="true"/>
    <field name="customer_note" type="string" nullable="true" version="true"/>
    <field name="internal_note" type="string" nullable="true" version="true"/>
    <many-to-one field="DeliveryAddress" target-entity="Address">
      <join-columns>
        <join-column
           name="delivery_address_id"
           referenced-column-name="id"
           on-delete="CASCADE"/>
      </join-columns>
    </many-to-one>
    <one-to-one field="BillingAddress" target-entity="Address">
      <join-columns>
        <join-column
           name="billing_address_id"
           referenced-column-name="id"
           unique="true"
           on-delete="CASCADE"/>
      </join-columns>
    </one-to-one>
    <options>
      <option name="charset" value="utf8"/>
      <option name="collate" value="utf8_unicode_ci"/>
    </options>
  </entity>
</doctrine-mapping>

EcommerceOrder:
  type: entity
  changeTrackingPolicy: DEFERRED_IMPLICIT
  schema: ecommerce_order
  repositoryClass: Doctrine\ORM\EntityRepository
  fields:
    id:
      id: true
      type: integer
      length: 4
      generator:
        strategy: SEQUENCE
      options:
        unsigned: true
    ordered_at:
      type: timestamp
      nullable: true
    customer_note:
      type: string
      nullable: true
      version: true
    internal_note:
      type: string
      nullable: true
      version: true
  options:
    charset: utf8
    collate: utf8_unicode_ci
  oneToOne:
    BillingAddress:
      targetEntity: Address
      joinColumns:
        billing_address_id:
          referencedColumnName: id
          unique: true
          onDelete: CASCADE
  manyToOne:
    DeliveryAddress:
      targetEntity: Address
      joinColumns:
        delivery_address_id:
          referencedColumnName: id
          onDelete: CASCADE

<?php
namespace App\Models\Base;
use Illuminate\Database\Eloquent\Model;

class EcommerceOrder extends Model
{
  protected $timestamps=false;
  protected $casts=[
    'id'=>'integer',
    'ecommerce_order_state_id'=>'integer',
    'contact_id'=>'integer',
    'delivery_address_id'=>'integer',
    'billing_address_id'=>'integer',
    'ordered_at'=>'datetime',
    'customer_note'=>'string',
    'internal_note'=>'string'
  ];
  protected $is_guarded=['internal_note'];
  protected $is_fillable=[
    'id',
    'ecommerce_order_state_id',
    'contact_id',
    'delivery_address_id',
    'billing_address_id',
    'ordered_at',
    'customer_note'
  ];
  public function Contact()
  {
    return $this->belongsTo('\App\Models\Contact','contact_id','id');
  }
  public function DeliveryAddress()
  {
    return $this->belongsTo('\App\Models\Address','delivery_address_id','id');
  }
  public function BillingAddress()
  {
    return $this->belongsTo('\App\Models\Address','billing_address_id','id');
  }
  public function OrderItem()
  {
    return $this->hasMany('\App\Models\EcommerceOrderItem','ecommerce_order_id','id');
  }
  public function OrderSimpleItem()
  {
    return $this->hasMany('\App\Models\EcommerceOrderSimpleItem','ecommerce_order_id','id');
  }
}