Can't insert value to mapped column in Doctrine 2 in OneToOne relation

问题

I am quite new to Doctrine and need help in one situation. I have 2 simple tables Albums & Genre. Please check the structures below:

Albums

id | title   | genre_id | createdon
1  | Album 1 | 1        | 21/05/2015
2  | Album 2 | 2        | 21/05/2015

Genre

id | genre   | active
1  | Pop     | 1
2  | Blue    | 1
3  | Rock    | 1
4  | Country | 1

genre_id from Albums table is mapped to id column of Genre table.

In Albums entity I have mapped this by the below process:

/**
 * @ORM\OneToOne(targetEntity="Genre", mappedBy="albums")
 * @ORM\JoinColumn(name="genre_id", referencedColumnName="id")
 **/
private $genre;

public function getGenre(){
    return $this->genre;    
}

public function setGenre($value)
{
    $this->genre = $value;
    return $this;
}

I can fetch genre name flawlessly by getGenre() method but the problem is while inserting value into the database. I need to insert genre_id which is an integer value but after calling setGenre() method from controller I am getting the following error:

Expected value of type "Album\Entity\Genre" for association field "Album\Entity\Albums#$genre", got "string" instead.

I have also tried by specifying another private variable like the original column name i.e genre_id like below:

/** @ORM\Column(type="integer") */
protected $genre_id;

public function setGenre($value)
{
   $this->genre_id = $value;
   return $this;
}

But then I am getting the following error:

An exception occurred while executing 'INSERT INTO Albums (title, createdon, genre_id) VALUES (?, ?, ?)' with params ["nfhgfh", "21/05/2015", null]:

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'genre_id' cannot be null

I am calling the entity from controller like this:

$albums = new Albums();
$albums->setTitle($postData['title']);
$albums->setGenre($postData['genre_id']);
$albums->setCreatedon(date('d/m/Y'));
$this->em()->persist($albums);

$this->em()->flush();

I am badly stuck in this problem and need your help. I am not having any clue how its getting a null value instead. Please help.

回答1:

Querying Genre by id worked for me. Please find my updated code below in controller:

$albums = new Albums();
$albums->setTitle($postData['title']);
$albums->setCreatedon(date('d/m/Y'));

$genre = $this->em()->find('Album\Entity\Genre', $postData['genre_id']);

$albums->setGenre($genre);
$this->em()->persist($albums);

$this->em()->flush();

Is this the process you specified? Thanks for the help.

回答2:

The problem is that you need to set genre in Album to be an instance of Album\Entity\Genre.

For example:

$genre = new Genre();
$genre->setId($postData['genre_id']);

$albums = new Albums();
$albums->setTitle($postData['title']);
$albums->setGenre($genre);
$albums->setCreatedon(date('d/m/Y'));

$this->em()->persist($albums);
$this->em()->flush();

EDIT

To fix cascading errors you need to add a cascade parameter to your mapping.

/**
 * @ORM\OneToOne(targetEntity="Genre", mappedBy="albums", cascade={"persist"})
 * @ORM\JoinColumn(name="genre_id", referencedColumnName="id")
 **/
private $genre;

You may also need to add a similar thing to the $album variable in your Genre entity, I can't remember exactly which way round it needs to be.

来源：https://stackoverflow.com/questions/30372647/cant-insert-value-to-mapped-column-in-doctrine-2-in-onetoone-relation

标签

php

zend-framework

doctrine-orm

zend-framework2

doctrine