php Doctrine Tabel Realtion Annotations（ManyToOne，OneToMany，ManyToMany）

Posted 2021-05-04

<?php

namespace AppBundle\Entity;

/**
 * @ORM\Entity
 * @ORM\Table(name="tasks") 
 */
class Task
{
    ...
    /**
     * @ORM\ManyToMany(targetEntity="Category", inversedBy="tasks")
     * @ORM\JoinTable(name="categories",
     *       joinColumns={@ORM\JoinColumn(name="category_id", referencedColumnName="id")},
     *       inverseJoinColumns={@ORM\JoinColumn(name="task_id", referencedColumnName="id")})                         
     */
    protected $category;
    ...
}

/**
 * @ORM\Entity
 * @ORM\Table(name="categories") 
 */
class Category
{
    ...
    /**
     * @ORM\ManyToMany(targetEntity="Task", mappedBy="category")
     * @ORM\JoinTable(name="categories",
     *       joinColumns={@ORM\JoinColumn(name="task_id", referencedColumnName="id")},
     *       inverseJoinColumns={@ORM\JoinColumn(name="category_id", referencedColumnName="id")})
     */
    private $tasks;            
...

<?php

namespace AppBundle\Entity;

use AppBundle\Entity\Presentation;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
use Doctrine\Common\Collections\Collection;

/**
 * Class User
 * @package AppBundle\Entity
 * @ORM\Entity
 * @ORM\Table(name="event")
 */
class Event
{
      /**
     * @var Collection<Presentation>|null
     *
     * @ORM\OneToMany(
     *     targetEntity="AppBundle\Entity\Presentation",
     *     mappedBy="event",
     *     cascade={"persist"},
     *     orphanRemoval=true
     * )
     * This "ORM\JoinTable(inverseJoinColumns={ORM\JoinColumn(unique=true)})"
     * is a fix for set the parent id into the presentation foreign field!
     * @ORM\JoinTable(inverseJoinColumns={@ORM\JoinColumn(unique=true)})
     */
    private $presentations;

    /**
     * Event constructor.
     */
    public function __construct()
    {
        $this->presentations = new ArrayCollection();
    }

    /**
     * Returns the Presentation
     *
     * @return Collection<Presentation>|null
     */
    public function getPresentations(): Collection
    {
        return $this->presentations;
    }

    /**
     * Add a Presentation
     *
     * @param Presentation $presentation
     * @return void
     */
    public function addPresentation(Presentation $presentation): void
    {
        if (!$presentation->getEvent() instanceof Event) {
            $presentation->setEvent($this);
        }
        $this->presentations[] = $presentation;
    }

    /**
     * Remove a Presentation
     *
     * @param Presentation $presentation
     * @return void
     */
    public function removePresentation(Presentation $presentation): void
    {
        $this->presentations->removeElement($presentation);
    }
}

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Class Presentation
 * @package AppBundle\Entity
 * @ORM\Entity
 * @ORM\Table(name="presentation")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\PresentationRepository")
 */
class Presentation
{

  /**
   * Location
   *
   * @ORM\ManyToOne(
   *    targetEntity="AppBundle\Entity\Location"
   * )
   * @ORM\JoinColumn(nullable=false)
   * @var \AppBundle\Entity\Location
   */
  protected $location;
  
   /**
     * Returns the Location
     *
     * @return Location|null
     */
    public function getLocation()
    {
        return $this->location;
    }

    /**
     * Sets the Location
     *
     * @param Location|null $location
     * @return void
     */
    public function setLocation($location)
    {
        $this->location = $location;
    }
  }