How to add properly one-to-many relationship in Doctrine 2? - php

Question

I have 2 files(tables) in my Entity, and want to join Like table to Comment table.I used one to many so can connect Comment.id to Like.comment_id and can get comments likes with one selection.When I doing this and dumping $comment->getLikes() I'm getting object of this type
object(Doctrine\ORM\PersistentCollection)
When try to do something like this $comment->getLikes()->first() getting
Undefined index:commentId
So I cant get likes from database, am I doing something wrong?And if it is possible explain why its working such way?
Here is comment Entity.
<?php
namespace App\Entity;
use App\Entity;
use Doctrine\ORM\Mapping;
/**
* #Entity
* #Table(name="comments")
*/
class Comment extends Entity
{
/**
*
* /**
* #Column(type="string", length=255)
* #var string
*/
protected $url;
/**
* #Column(type="string", length=255)
* #var string
*/
protected $description;
/**
* #Column(name="userId", type="integer")
* #var int
*/
protected $userId;
/**
* #Column(name="lng", type="float")
* #var float
*/
protected $lng;
/**
* #Column(name="lat", type="float")
* #var float
*/
protected $lat;
/**
* #Column(type="string", length=255)
* #var string
*/
protected $tags;
/**
* #var Like
* #OneToMany(targetEntity="Like", mappedBy="commentId")
**/
protected $likes;
/**
* #return string
*/
public function getUrl()
{
return $this->url;
}
/**
* #param string $url
*/
public function setUrl($url)
{
$this->url = $url;
}
/**
* #return string
*/
public function getDescription()
{
return $this->description;
}
/**
* #param string $description
*/
public function setDescription($description)
{
$this->description = $description;
}
/**
* #return int
*/
public function getUserId()
{
return $this->userId;
}
/**
* #param int $userId
*/
public function setUserId($userId)
{
$this->userId = $userId;
}
/**
* #return float
*/
public function getLong()
{
return $this->lng;
}
/**
* #param float $lng
*/
public function setLong($lng)
{
$this->lng = $lng;
}
/**
* #return float
*/
public function getLat()
{
return $this->lat;
}
/**
* #param float $lat
*/
public function setLat($lat)
{
$this->lat = $lat;
}
/**
* #return string
*/
public function getTags()
{
return $this->tags;
}
/**
* #param string $tags
*/
public function setTags($tags)
{
$this->tags = $tags;
}
/**
* #return array()
*/
public function getLikes()
{
return $this->likes;
}
}
an here is Like Entity
<?php
namespace App\Entity;
use App\Entity;
use Doctrine\ORM\Mapping;
/**
* #Entity
* #Table(name="like")
*/
class Like extends Entity
{
/**
* #Column(name="commentId", type="integer")
* #var int
*/
protected $commentId;
/**
* #Column(name="userId", type="integer")
* #var int
*/
protected $userId;
/**
* #return int
*/
public function getCommentId()
{
return $this->commentId;
}
/**
* #param int $commentId
*/
public function setCommentId($commentId)
{
$this->commentId = $commentId;
}
/**
* #return int
*/
public function getUserId()
{
return $this->userId;
}
/**
* #param int $userId
*/
public function setUserId($userId)
{
$this->userId = $userId;
}
}

Answer 1

class Comment
{
/**
* #Id
* #Column(type="integer")
* #GeneratedValue
*/
private $id;
/**
* #Column(type="string", length=255)
* #var string
*/
protected $url;
/**
* #Column(type="string", length=255)
* #var string
*/
protected $description;
/**
* #Column(name="userId", type="integer")
* #var int
*/
protected $userId;
/**
* #Column(name="lng", type="float")
* #var float
*/
protected $lng;
/**
* #Column(name="lat", type="float")
* #var float
*/
protected $lat;
/**
* #Column(type="string", length=255)
* #var string
*/
protected $tags;
/**
* #OneToMany(targetEntity="Like", mappedBy="comment")
*/
protected $likes;
public function __construct()
{
$this->likes = new ArrayCollection();
}
/**
* #return string
*/
public function getUrl()
{
return $this->url;
}
/**
* #param string $url
*/
public function setUrl($url)
{
$this->url = $url;
}
/**
* #return string
*/
public function getDescription()
{
return $this->description;
}
/**
* #param string $description
*/
public function setDescription($description)
{
$this->description = $description;
}
/**
* #return int
*/
public function getUserId()
{
return $this->userId;
}
/**
* #param int $userId
*/
public function setUserId($userId)
{
$this->userId = $userId;
}
/**
* #return float
*/
public function getLong()
{
return $this->lng;
}
/**
* #param float $lng
*/
public function setLong($lng)
{
$this->lng = $lng;
}
/**
* #return float
*/
public function getLat()
{
return $this->lat;
}
/**
* #param float $lat
*/
public function setLat($lat)
{
$this->lat = $lat;
}
/**
* #return string
*/
public function getTags()
{
return $this->tags;
}
/**
* #param string $tags
*/
public function setTags($tags)
{
$this->tags = $tags;
}
/**
* #param Like $like
*/
public function addLike(Like $like)
{
$this->likes->add($like);
$like->setComment($this);
}
/**
* #return ArrayCollection
*/
public function getLikes()
{
return $this->likes;
}
}
/**
* #Entity
* #Table(name="likes")
*/
class Like
{
/**
* #Id
* #Column(type="integer")
* #GeneratedValue
*/
private $id;
/**
* #ManyToOne(targetEntity="Comment", inversedBy="likes")
*/
protected $comment;
/**
* #param mixed $comment
*/
public function setComment(Comment $comment)
{
$this->comment = $comment;
}
/**
* #Column(name="userId", type="integer")
*/
protected $userId;
/**
* #return int
*/
public function getUserId()
{
return $this->userId;
}
/**
* #param int $userId
*/
public function setUserId($userId)
{
$this->userId = $userId;
}
}
FYI : Change like to likes or others because mysql keyword LIKE