doctrine mapping for self referencing class attribute - php

Question

I have a Forum Entity that may contain sub forums which will be of the same class(Forum) . i am having trouble with establishing this relation .
the code below is what i have tried so far in my Forum class
/**
* #var integer
*
* #ORM\Column(name="id", type="integer", nullable=false)
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="name", type="string", length=255, nullable=false)
*/
private $name;
/**
* #var string
*
* #ORM\Column(name="description", type="string", length=5000, nullable=false)
*/
private $description;
/**
* #ORM\Column(type="string")
*
* #Assert\NotBlank(message="Please, upload the forum wallpaper as a PNG file.")
* #Assert\File(mimeTypes={ "image/png" })
*/
private $wallpaper;
/**
* #var \DateTime
*
* #ORM\Column(name="added_date", type="datetime", nullable=false)
*/
private $addedDate;
/**
* #var array
*
* #ORM\ManyToMany(targetEntity="AppBundle\Entity\User", cascade={"remove"})
*/
private $moderators;
/**
* #var Forum[]
* #ORM\OneToMany(targetEntity="Forum", mappedBy="id", cascade={"all"}, orphanRemoval=true)
*/
private $subForums;
/**
* #var \AppBundle\Entity\User
*
* #ORM\ManyToOne(targetEntity="AppBundle\Entity\User")
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
* })
*/
private $userId;
the problem after updating the database scheme i didnt end up with any table linkin forums and subforums so i am confused how can i add a sub forum to an exsiting forum later on . Any help is much appriciated

Answer 1

I believe what you are looking for is a One-To-Many self-referencing mapping
So change your $subForums like so:
/**
* #var Forum[]
* #ORM\OneToMany(targetEntity="Forum", mappedBy="parentForum", cascade={"all"}, orphanRemoval=true)
*/
private $subForums;
and add $parentForum, like so:
/**
* #ManyToOne(targetEntity="Forum", inversedBy="subForums")
* #JoinColumn(name="parent_id", referencedColumnName="id")
*/
private $parentForum;