Doctrine ORM将产品绑定到多个实体

Question

I have businesses, categories and products. Categories are assigned to businesses and products are assigned to categories and businesses.

Reason being, one product can be assigned to different categories in different businesses.

Business and Category entities are working fine, but I am not sure how to write a Product entity to achieve what I need...

Business Entity:

namespace Raiel\AFMage\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity()
 * @ORM\Table(name="businesses")
 */
class Business {
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue(strategy="AUTO")
     * @ORM\Column(type="integer", name="id")
     */
    private $id;

    /**
     * @ORM\Column(name="name", type="string", length=64)
     */
    private $name;

    /**
     *
     * @ORM\ManyToMany(targetEntity="Category", inversedBy="businesses")
     * @ORM\JoinTable(
     *  name="business_categories",
     *  joinColumns={
     *      @ORM\JoinColumn(name="business_id", referencedColumnName="id")
     *  },
     *  inverseJoinColumns={
     *      @ORM\JoinColumn(name="category_id", referencedColumnName="id")
     *  }
     * )
     */
    private $categories;

    /**
     * Default constructor, initializes collections
     */
    public function __construct() {
        $this->categories = new ArrayCollection();
    }
}

Category Entity:

<?php

namespace Raiel\AFMage\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;

/**
 * @Gedmo\Tree(type="nested")
 * @ORM\Table(name="categories")
 * @ORM\Entity(repositoryClass="Gedmo\Tree\Entity\Repository\NestedTreeRepository")
 */
class Category {
    /**
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue
     */
    private $id;

    /**
     *
     * @ORM\ManyToMany(targetEntity="Business", mappedBy="categories")
     */
    private $businesses;

    /**
     * @Gedmo\TreePath
     * @ORM\Column(name="path", type="string", length=3000, nullable=true)
     */
    private $path;

    /**
     * @ORM\Column(name="title", type="string", length=64)
     */
    private $title;

    /**
     * @Gedmo\TreeLevel
     * @ORM\Column(name="lvl", type="integer")
     */
    private $lvl;

    /**
     * @Gedmo\TreeLeft
     * @ORM\Column(name="lft", type="integer")
     */
    private $lft;

    /**
     * @Gedmo\TreeRight
     * @ORM\Column(name="rgt", type="integer")
     */
    private $rgt;

    /**
     * @Gedmo\TreeRoot
     * @ORM\Column(name="root", type="integer", nullable=true)
     */
    private $root;

    /**
     * @Gedmo\TreeParent
     * @ORM\ManyToOne(targetEntity="Category", inversedBy="children")
     * @ORM\JoinColumn(name="parent_id", referencedColumnName="id", onDelete="CASCADE")
     */
    private $parent;

    /**
     * @ORM\OneToMany(targetEntity="Category", mappedBy="parent")
     * @ORM\OrderBy({"lft" = "ASC"})
     */
    private $children;
    /**
     * Constructor
     */
    public function __construct() {
        $this->children   = new ArrayCollection();
        $this->businesses = new ArrayCollection();
    }
}

Also, $business->addCategory works fine but $category->addBusiness doesn't save to DB.

Answer 1

Your product entity will probably look something like:

namespace Raiel\AFMage\Entity;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity()
 * @ORM\Table(name="products")
 */
class Product {
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue(strategy="AUTO")
     * @ORM\Column(type="integer", name="id")
     */
    private $id;

    /**
     * @ORM\Column(name="name", type="string", length=64)
     */
    private $name;

    /**
     *
     * @ORM\ManyToMany(targetEntity="Category", inversedBy="products")
     * @ORM\JoinTable(
     *  name="product_categories",
     *  joinColumns={
     *      @ORM\JoinColumn(name="product_id", referencedColumnName="id")
     *  },
     *  inverseJoinColumns={
     *      @ORM\JoinColumn(name="category_id", referencedColumnName="id")
     *  }
     * )
     */
    private $categories;

    /**
     *
     * @ORM\ManyToMany(targetEntity="Business", inversedBy="products")
     * @ORM\JoinTable(
     *  name="product_businesses",
     *  joinColumns={
     *      @ORM\JoinColumn(name="product_id", referencedColumnName="id")
     *  },
     *  inverseJoinColumns={
     *      @ORM\JoinColumn(name="business_id", referencedColumnName="id")
     *  }
     * )
     */
    private $businesses;
}

So more or less what you have for your Business entity but with the ManyToMany relation using a different join table.

And to make $category->addBusiness() work then you'll probably want to add a cascade option to category, thusly:

/**
 *
 * @ORM\ManyToMany(targetEntity="Business", mappedBy="categories", cascade="persist")
 */
private $businesses;

This informs Doctrine that anything new added to the $businesses array collection should be persisted, take a look at the documentation for details.