小编dhi*_*idy的帖子

我有一些问题.我是研究并尝试所有建议,但没有人工作.

我最终得到:

Argument 1 passed to Entity\User::addCategories() must be an instance of Entity\Category, string given,

i have manytomany relationship, user, user_category, and category

user

<?php

namespace Entity;

use Doctrine\Common\Collections\ArrayCollection;

use Gedmo\Mapping\Annotation as Gedmo;
use Doctrine\ORM\Mapping as ORM;

/**
 * @Entity
 * @Table(name="user")
 */
class User
{

    /**
     * @Id
     * @Column(type="integer", nullable=false)
     * @GeneratedValue(strategy="AUTO")
     */
    public $id;

    /**
     * @Column(type="string", length=255, unique=true, nullable=false)
     */
    public $name;


    /**
     * @ManyToMany(targetEntity="Entity\Category", inversedBy="user")
     * @ORM\JoinTable(name="user_category")
     */
    public $categories;

        public function __construct() {
            $this->category …