Doctrine 2 and Symfony 2 Dynamic Target

Question

I want the dynamic mapping of objects on one object to be used by other objects. For example, I have a File object that will store the type MIME, association key, nameetc., and also entity_idthat will contain an identifier for the object to which it belongs. The mapping keywill determine the class, since this file object will be many-to-many. Thus, the object targetEntityfor the file is not fixed. How to achieve this?

File entity

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * File
 *
 * @ORM\Entity
 */
class File {
    //.... Other mapping properties

    /**
     * @ORM\ManyToOne(targetEntity="SuperClass", inversedBy="files")
     * @ORM\JoinColumn(name="entity_id", referencedColumnName="id", onDelete="CASCADE")
     */
    protected $entity;
}

Product

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Product
 *
 * @ORM\Entity
 */
class Product extends SuperClass {
    //.... Other mapping properties

    /**
     * @ORM\OneToMany(targetEntity="File", mappedBy="entity")
     */
    protected $files;
}

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Answer 1

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Answer 2

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CREATE TABLE Product (
    id INT AUTO_INCREMENT NOT NULL,
    PRIMARY KEY(id)
) ENGINE = InnoDB;

CREATE TABLE Feature (
    id INT AUTO_INCREMENT NOT NULL,
    product_id INT DEFAULT NULL,
    PRIMARY KEY(id)
) ENGINE = InnoDB;

ALTER TABLE Feature ADD FOREIGN KEY (product_id) REFERENCES Product(id);

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