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可捕获的致命错误:类AppBundle\Entity\Categoria的对象无法转换为字符串

Produto.php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * Produto
 *
 * @ORM\Table(name="produto")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\ProdutoRepository")
 */
class Produto
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="descricao", type="string", length=50)
     */
    private $descricao;

    /**
     * @ORM\ManyToOne(targetEntity="Categoria", inversedBy="produtos")
     * @ORM\JoinColumn(name="categoria_id", referencedColumnName="id")
     */
    private $categoria;


    /**
     * @var decimal
     *
     * @ORM\Column(name="valor", type="decimal", scale=2)
     */
    private $valor;

    /**
     * @var int
     *
     * @ORM\Column(name="multiplo", type="integer")
     */
    private $multiplo;

    /** …
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orm doctrine entity-framework symfony doctrine-orm

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doctrine ×1

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entity-framework ×1

orm ×1

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