How can I inverse my column in Symfony 4 (ManyToMany)? - symfony

Question

This is my entity Fields:
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\ArrayCollection;
/**
* #ORM\Entity(repositoryClass="App\Repository\FieldsRepository")
*/
class Fields
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer",unique=true)
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $name;
/**
* #ORM\Column(type="string", length=10, unique=true)
*/
private $unique_id;
/**
* #ORM\ManyToMany(targetEntity="Productgroup")
* #ORM\JoinColumn(name="productgroup", referencedColumnName="id")
*/
private $productgroup;
/**
* #ORM\ManyToOne(targetEntity="Type")
* #ORM\JoinColumn(name="type", referencedColumnName="id")
*/
private $type;
//Getters & Setters
public function getId()
{
return $this->id;
}
public function getUniqueId(): ?string
{
return $this->unique_id;
}
public function setUniqueId(string $unique_id): self
{
$this->unique_id = $unique_id;
return $this;
}
public function getName()
{
return $this->name;
}
public function setName($name)
{
$this->name = $name;
}
public function getType(): ?Type
{
return $this->type;
}
public function setType(?Type $type): self
{
$this->type = $type;
return $this;
}
public function getProductgroup()
{
return $this->productgroup;
}
public function setProductgroup($productgroup): self
{
$this->productgroup = $productgroup;
return $this;
}
public function addProductgroup(Productgroup $productgroup): self
{
$this->productgroup[] = $productgroup;
return $this;
}
public function __construct()
{
$this->productgroup = new ArrayCollection();
}
}
And my entity productgroup:
<?php
namespace App\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass="App\Repository\ProductgroupRepository")
*/
class Productgroup
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $name;
/**
* #ORM\Column(type="string", length=10)
*/
private $unique_id;
public function getId(): ?int
{
return $this->id;
}
public function getUniqueId(): ?string
{
return $this->unique_id;
}
public function setUniqueId(string $unique_id): self
{
$this->unique_id = $unique_id;
return $this;
}
public function getName(): ?string
{
return $this->name;
}
public function setName(string $name): self
{
$this->name = $name;
return $this;
}
}
The output in my datatable "Fields" is this:
And the output in my datatable "productgroup" is this:
I Like that now in inverse in my productgroup I see also the fields that are connected to the productgroup.
I tried to add an inverseredBy to the row:
/**
* #ORM\ManyToMany(targetEntity="Productgroup", inversedBy="Fields")
* #ORM\JoinColumn(name="productgroup", referencedColumnName="id")
*/
private $productgroup;
But I do not get the result I wish.

Answer 1

You are looking for Many To Many relationship, though Bidirectional
In your case, it should be
/**
* #ManyToMany(targetEntity="Productgroup", inversedBy="fields")
* #JoinTable(name="productgroups_fields")
*/
private $productgroup;
And for Productgroup entity
/**
* Many Groups have Many fields.
* #ManyToMany(targetEntity="Fields", mappedBy="productgroup")
*/
private $fields;
Please, note that inversedBy refers to entity property therefore it should be fields, but not Fields