Symfony Doctrine Insert: cannot insert into column "id" - php

Question

I'm modeling a vending machine where I got 3 Entities (Milk, Sugar, Coffee) and one table that lists all my coffee machines.
Now I want to insert a new value for the amount of milk left. The coffee machines are foreign keys in the resources tables.
However, I get this error, which does not seem to make sense, as I am just setting a foreign key field:
An exception occurred while executing a query: SQLSTATE[428C9]: <<Unknown error>>: 7 ERROR: cannot insert into column "id"
DETAIL: Column "id" is an identity column defined as GENERATED ALWAYS.
HINT: Use OVERRIDING SYSTEM VALUE to override.
Here are the tables (Postgres) (only coffee listed - milk and sugar have the same architecture):
create table coffee (
id integer not null generated always as identity primary key,
request_id bigint,
logdate timestamp(0) without time zone not null,
vmc_no integer,
amount integer not null,
constraint fk_request
foreign key(request_id)
references energyomat.request(id),
constraint fk_vmc_company
foreign key(vmc_no)
references energyomat.vmc_company(vmc_no)
);
create table vmc_company (
vmc_no integer not null unique primary key,
register_date timestamp(0) without time zone not null
);
I've set the primitive fields and got the Entity of VmcCompany and set it as the foreign value (setVmcNo).
public function updateResources($vmcNo, $milkAmount, $sugarAmount, $coffeeAmount)
{
$milk = new Milk();
$sugar = new Sugar();
$coffee = new Coffee();
if($milkAmount != null) {
$milk->setAmount($milkAmount);
$milk->setLogdate(new \DateTime());
$vmc = $this->doctrine->getRepository(VmcCompany::class)->find($vmcNo);
$milk->setVmcNo($vmc);
$manager = $this->doctrine->getManager();
$manager->persist($milk);
}
if($sugarAmount != null) {
$sugar->setAmount($sugarAmount);
$sugar->setLogdate(new \DateTime());
$vmc = $this->doctrine->getRepository(VmcCompany::class)->find($vmcNo);
$sugar->setVmcNo($vmc);
$manager = $this->doctrine->getManager();
$manager->persist($sugar);
}
if($coffeeAmount != null) {
$coffee->setAmount($coffeeAmount);
$coffee->setLogdate(new \DateTime());
$vmc = $this->doctrine->getRepository(VmcCompany::class)->find($vmcNo);
$coffee->setVmcNo($vmc);
$manager = $this->doctrine->getManager();
$manager->persist($coffee);
}
$manager->flush();
}
Here are the Entity classes:
Coffee:
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* Coffee
*
* #ORM\Table(name="coffee", indexes={#ORM\Index(name="IDX_538529B3427EB8A5", columns={"request_id"}), #ORM\Index(name="IDX_538529B3651BF703", columns={"vmc_no"})})
* #ORM\Entity
*/
class Coffee
{
/**
* #var int
*
* #ORM\Column(name="id", type="integer", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="SEQUENCE")
* #ORM\SequenceGenerator(sequenceName="coffee_id_seq", allocationSize=1, initialValue=1)
*/
private $id;
/**
* #var \DateTime
*
* #ORM\Column(name="logdate", type="datetime", nullable=false)
*/
private $logdate;
/**
* #var int
*
* #ORM\Column(name="amount", type="integer", nullable=false)
*/
private $amount;
/**
* #var \Request
*
* #ORM\ManyToOne(targetEntity="Request")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="request_id", referencedColumnName="id")
* })
*/
private $request;
/**
* #var \VmcCompany
*
* #ORM\ManyToOne(targetEntity="VmcCompany")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="vmc_no", referencedColumnName="vmc_no")
* })
*/
private $vmcNo;
public function getId(): ?int
{
return $this->id;
}
public function getLogdate(): ?\DateTimeInterface
{
return $this->logdate;
}
public function setLogdate(\DateTimeInterface $logdate): self
{
$this->logdate = $logdate;
return $this;
}
public function getAmount(): ?int
{
return $this->amount;
}
public function setAmount(int $amount): self
{
$this->amount = $amount;
return $this;
}
public function getRequest(): ?Request
{
return $this->request;
}
public function setRequest(?Request $request): self
{
$this->request = $request;
return $this;
}
public function getVmcNo(): ?VmcCompany
{
return $this->vmcNo;
}
public function setVmcNo(?VmcCompany $vmcNo): self
{
$this->vmcNo = $vmcNo;
return $this;
}
}
VmcCompany:
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* VmcCompany
*
* #ORM\Table(name="vmc_company")
* #ORM\Entity
*/
class VmcCompany
{
/**
* #var int
*
* #ORM\Column(name="vmc_no", type="integer", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="SEQUENCE")
* #ORM\SequenceGenerator(sequenceName="vmc_company_vmc_no_seq", allocationSize=1, initialValue=1)
*/
private $vmcNo;
/**
* #var \DateTime
*
* #ORM\Column(name="register_date", type="datetime", nullable=false)
*/
private $registerDate;
public function getVmcNo(): ?int
{
return $this->vmcNo;
}
public function getRegisterDate(): ?\DateTimeInterface
{
return $this->registerDate;
}
public function setRegisterDate(\DateTimeInterface $registerDate): self
{
$this->registerDate = $registerDate;
return $this;
}
}
I'm new to Symfony / Doctrine and so I guess I'm overseeing something, but just cannot find out what it is. Thanks for your help in advance.

Answer 1

If someone else runs into this problem:
You need to declare the id field in the database table as follows:
id integer NOT NULL GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
The emphasis lies on BY DEFAULT instead of ALWAYS.
Otherwise Symfony runs into a conflict with Postgres while auto-incrementing.