Symfony2 Doctrine, joining tables by its foreign key

Question

I've imported two tables with data that were given to me into the Symfony database and want to join the two by a foreign key.

Table Main has columns: ID, indate, dano, partno, batchno
Table Sub has columns: ID, main_id, rackno, code, qty

I want to join the tables together as a one to many(?) since one main can have many subs. For example, one dano can have many rackno. I am guessing the *main_id* in Table Sub and id in Table Main are the keys that will be used to join.

How do I go about joining the two with Doctrine? I have the tables separated by its own Entity files.

On Main.php

class Main
{
/**
 * @var integer
 * @ORM\ManyToOne(targetEntity="Sub", mappedBy="mainId")
 */
private $id;

/**
 * @var \DateTime
 */
private $indate;

/**
 * @var string
 */
private $dano;

/**
 * @var string
 */
private $partno;

/**
 * @var integer
 */
private $batchno;

On Sub.php:

class Sub
{
/**
 * @var integer
 */
private $id;

/**
 * @var integer
 * @ORM\ManyToOne(targetEntity="Main", inversedBy="id")
 * @ORM\JoinColumn(name="id", referencedColumnName="id")
 */
private $mainId;

/**
 * @var string
 */
private $rackno;

/**
 * @var string
 */
private $code;

/**
 * @var integer
 */
private $qty;

Answer 1

You can't process like this. If you need an ManyToOne relation, you need this:

In your Main class:

/**
 * @ORM\OneToMany(targetEntity="Sub", mappedBy="main")
 */
private $sub;

And in your Sub class:

/**
 * @ORM\ManyToOne(targetEntity="Main", inversedBy="sub")
 * @ORM\JoinColumn(name="main_id", referencedColumnName="id")
 */
 private $main;

And don't forget to sync your database ;)