Symfony3 - Entities don't work with relations

Starring for this for several hours now, maybe I missed something obvious.

Have this database structure (with indexes, and constraints)

CREATE TABLE `exploit` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `edb_id` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
  `date` datetime not null,
  `author` bigint(20) not null ,
  `name` varchar(255) not null,
  `category` bigint(20) not null,
  `version` varchar(255) not null,
  `type` bigint(20) not null,
  `content` longtext COLLATE utf8_unicode_ci NOT NULL,
  `dork` varchar(255) null,
  `software_link` varchar(255) null,
  `tested_on` varchar(255) null,
  PRIMARY KEY (`id`),
  KEY `exploit_category_idx` (`category`),
  KEY `exploit_type_idx` (`type`),
  KEY `exploit_author_idx` (`author`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE `category` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`id`),
  KEY `category_name_id_idx` (`id`),
  CONSTRAINT `category_name_id` FOREIGN KEY (`id`) REFERENCES `exploit` (`category`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE `type` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`id`),
  KEY `type_name_id_idx` (`id`),
  CONSTRAINT `type_name_id` FOREIGN KEY (`id`) REFERENCES `exploit` (`type`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

CREATE TABLE `author` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`id`),
  KEY `author_name_id_idx` (`id`),
  CONSTRAINT `author_name_id` FOREIGN KEY (`id`) REFERENCES `exploit` (`author`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

Created these entities:

::::::::::::::
Author.php
::::::::::::::
<?php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Exploit;

/**
 * Author
 *
 * @ORM\Table(name="author", indexes={@ORM\Index(name="author_name_id_idx", columns={"id"})})
 * @ORM\Entity
 */
class Author
{

    /**
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="NONE")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", author="string", length=255, nullable=false)
     */
    private $name;


/**
 * @ORM\OneToMany(targetEntity="AppBundle\Entity\Exploit", mappedBy="author", cascade={"persist", "remove"})
 * @ORM\JoinColumn(name="exploits", referencedColumnName="id")
 */
private $exploits;

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

    /**
     * Set name
     *
     * @param string $name
     *
     * @return Author
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Get id
     *
     */
    public function getId()
    {
        return $this->id;
    }

    public function __toString() 
    {
        return $this->name;
    }


/**
 * @param Exploits $exploit
 *
 * @return Author
 */
public function addExploit($exploit)
{
        $this->exploits->add($exploit);

    return $this;
}

/**
 * @param Collection $exploits
 *
 * @return Author
 */
public function setExploits(Collection $exploits)
{
    $this->exploits->clear();

    foreach ($exploits as $exploit) {
        $exploit->add($this);
    }

    $this->exploits = $exploits;

    return $this;
}
}
::::::::::::::
Category.php
::::::::::::::
<?php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Exploit;

/**
 * Category
 *
 * @ORM\Table(name="category", indexes={@ORM\Index(name="category_name_id_idx", columns={"id"})})
 * @ORM\Entity
 */
class Category
{

    /**
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="NONE")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", category="string", length=255, nullable=false)
     */
    private $name;


/**
 * @ORM\OneToMany(targetEntity="AppBundle\Entity\Exploit", mappedBy="category", cascade={"persist", "remove"})
 * @ORM\JoinColumn(name="exploits", referencedColumnName="id")
 */
private $exploits;

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

    /**
     * Set name
     *
     * @param string $name
     *
     * @return Author
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Get id
     *
     */
    public function getId()
    {
        return $this->id;
    }

    public function __toString() 
    {
        return $this->name;
    }


/**
 * @param Exploits $exploit
 *
 * @return Author
 */
public function addExploit($exploit)
{
        $this->exploits->add($exploit);

    return $this;
}

/**
 * @param Collection $exploits
 *
 * @return Author
 */
public function setExploits(Collection $exploits)
{
    $this->exploits->clear();

    foreach ($exploits as $exploit) {
        $exploit->add($this);
    }

    $this->exploits = $exploits;

    return $this;
}
}
::::::::::::::
Exploit.php
::::::::::::::
<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Author;
use AppBundle\Entity\Type;
use AppBundle\Entity\Category;

/**
 * Exploit
 *
 * @ORM\Table(name="exploit", indexes={@ORM\Index(name=exploit_category_idx", columns={"category"}), @ORM\Index(name="exploit_type_idx", columns={"type"}), @ORM\Index(name="exploit_author_idx", columns={"
author"})})
 */
class Exploit
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="bigint", nullable=false)
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="edb_id", type="string", length=100, nullable=false)
     */
    private $edbId;

    /**
     * @var \DateTime
     *
     * @ORM\Column(name="date", type="datetime", nullable=false)
     */
    private $date;

     /**
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Author", inversedBy="exploits")
     * @ORM\JoinColumn(name="author", referencedColumnName="id")
     */
    private $author;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255, nullable=false)
     */
    private $name;

     /**
     * @var integer
     *
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Category", inversedBy="exploits")
     * @ORM\JoinColumn(name="category", referencedColumnName="id")
     */
    private $category;

    /**
     * @var string
     *
     * @ORM\Column(name="version", type="string", length=255, nullable=false)
     */
    private $version;

     /**
     * @var integer
     *
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Type", inversedBy="exploits")
     * @ORM\JoinColumn(name="type", referencedColumnName="id")
     */
    private $type;

    /**
     * @var string
     *
     * @ORM\Column(name="content", type="text", nullable=false)
     */
    private $content;

    /**
     * @var string
     *
     * @ORM\Column(name="dork", type="string", length=255, nullable=true)
     */
    private $dork;

    /**
     * @var string
     *
     * @ORM\Column(name="software_link", type="string", length=255, nullable=true)
     */
    private $softwareLink;

    /**
     * @var string
     *
     * @ORM\Column(name="tested_on", type="string", length=255, nullable=true)
     */
    private $testedOn;



    /**
     * Set edbId
     *
     * @param integer $edbId
     *
     * @return Exploit
     */
    public function setEdbId($edbId)
    {
        $this->edbId = $edbId;

        return $this;
    }

    /**
     * Get edbId
     *
     * @return integer
     */
    public function getEdbId()
    {
        return $this->edbId;
    }

    /**
     * Set date
     *
     * @param \DateTime $date
     *
     * @return Exploit
     */
    public function setDate($date)
    {
        $this->date = $date;

        return $this;
    }

    /**
     * Get date
     *
     * @return \DateTime
     */
    public function getDate()
    {
        return $this->date;
    }

    /**
     * Set author
     *
     * @param integer $author
     *
     * @return Exploit
     */
    public function setAuthor($author)
    {
        $this->author = $author;

        return $this;
    }

    /**
     * Get author
     *
     * @return integer
     */
    public function getAuthor()
    {
        return $this->author;
    }

    /**
     * Set name
     *
     * @param string $name
     *
     * @return Exploit
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Set category
     *
     * @param integer $category
     *
     * @return Exploit
     */
    public function setCategory($category)
    {
        $this->category = $category;

        return $this;
    }

    /**
     * Get category
     *
     * @return integer
     */
    public function getCategory()
    {
        return $this->category;
    }

    /**
     * Set version
     *
     * @param string $version
     *
     * @return Exploit
     */
    public function setVersion($version)
    {
        $this->version = $version;

        return $this;
    }

    /**
     * Get version
     *
     * @return string
     */
    public function getVersion()
    {
        return $this->version;
    }

    /**
     * Set type
     *
     * @param integer $type
     *
     * @return Exploit
     */
    public function setType($type)
    {
        $this->type = $type;

        return $this;
    }

    /**
     * Get type
     *
     * @return integer
     */
    public function getType()
    {
        return $this->type;
    }

    /**
     * Set content
     *
     * @param string $content
     *
     * @return Exploit
     */
    public function setContent($content)
    {
        $this->content = $content;

        return $this;
    }

    /**
     * Get content
     *
     * @return string
     */
    public function getContent()
    {
        return $this->content;
    }

    /**
     * Set dork
     *
     * @param string $dork
     *
     * @return Exploit
     */
    public function setDork($dork)
    {
        $this->dork = $dork;

        return $this;
    }

    /**
     * Get dork
     *
     * @return string
     */
    public function getDork()
    {
        return $this->dork;
    }

    /**
     * Set softwareLink
     *
     * @param string $softwareLink
     *
     * @return Exploit
     */
    public function setSoftwareLink($softwareLink)
    {
        $this->softwareLink = $softwareLink;

        return $this;
    }

    /**
     * Get softwareLink
     *
     * @return string
     */
    public function getSoftwareLink()
    {
        return $this->softwareLink;
    }

    /**
     * Set testedOn
     *
     * @param string $testedOn
     *
     * @return Exploit
     */
    public function setTestedOn($testedOn)
    {
        $this->testedOn = $testedOn;

        return $this;
    }

    /**
     * Get testedOn
     *
     * @return string
     */
    public function getTestedOn()
    {
        return $this->testedOn;
    }

    /**
     * Get id
     *
     * @return integer
     */
    public function getId()
    {
        return $this->id;
    }
}
::::::::::::::
Type.php
::::::::::::::
<?php
namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Exploit;

/**
 * Type
 *
 * @ORM\Table(name="type", indexes={@ORM\Index(name="type_name_id_idx", columns={"id"})})
 * @ORM\Entity
 */
class Type
{

    /**
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="NONE")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255, nullable=false)
     */
    private $name;


/**
 * @ORM\OneToMany(targetEntity="AppBundle\Entity\Exploit", mappedBy="type", cascade={"persist", "remove"})
 * @ORM\JoinColumn(name="exploits", referencedColumnName="id")
 */
private $exploits;

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

    /**
     * Set name
     *
     * @param string $name
     *
     * @return Type
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Get id
     *
     */
    public function getId()
    {
        return $this->id;
    }

    public function __toString() 
    {
        return $this->name;
    }


/**
 * @param Exploits $exploit
 *
 * @return Type
 */
public function addExploit($exploit)
{
        $this->exploits->add($exploit);

    return $this;
}

/**
 * @param Collection $exploits
 *
 * @return Type
 */
public function setExploits(Collection $exploits)
{
    $this->exploits->clear();

    foreach ($exploits as $exploit) {
        $exploit->add($this);
    }

    $this->exploits = $exploits;

    return $this;
}

}

but somehow when I make a query I get, like:

$exploits = $this->getDoctrine()
            ->getRepository('AppBundle:Exploit')
            ->findAll();

and in view

<th scope="row"> {{ exploit.id }} </th> 
        <td> {{ exploit.name }} </td> 
        <td> {{ exploit.author.name }} </td>
        <td> {{ exploit.type.name }} </td>
        <td> {{ exploit.category.name }} </td>
        <td>{{ exploit.date|date('F j, Y, g:i a') }}</td>

I get this error:

Impossible to access an attribute ("name") on a integer variable ("1").

Any good soul can look into this and try to reproduce it?

MySQL Dump to recreate the tables with content is here:

https://0bin.net/paste/2tV3MEw4A2tdAVsR#R3rBNW4seWkK9HtlJFwbsA6+RmhhWPilm40L8QfeiTp

Thanks!

标签： symfony doctrine-orm

2条回答

再贱就再见

2楼-- · 2019-03-06 13:00

It says it right there, you're trying to access the name attribute of something, but that something isn't an object. Its a 1.

You access .name several times so unsure which one of these it is without more info and a line number

 <th scope="row"> {{ exploit.id }} </th> 
    <td> {{ exploit.name }} </td> 
    <td> {{ exploit.author.name }} </td>
    <td> {{ exploit.type.name }} </td>
    <td> {{ exploit.category.name }} </td>
    <td>{{ exploit.date|date('F j, Y, g:i a') }}</td>  
 </th>

But if we assume its Author then its clear that the getAuthor() method returns a bigint.

How did you get that entity code and the database code? Because they do not look correct, they are getting and setting integers, rather than objects.

UPDATE

Generate entities with

php bin/console doctrine:generate:entities AppBundle

View the SQL using

php bin/console doctrine:schema:update --dump-sql

Execute the SQL using

php bin/console doctrine:schema:update --force

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3楼-- · 2019-03-06 13:02

Got it working with these entities:

::::::::::::::
Author.php
::::::::::::::
<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Exploit;

/**
 * User
 *
 * @ORM\Table(name="author")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\UserRepository")
 */
class Author
{
    /**
     * @var integer
     *
     * @ORM\Column(name="a_id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $a_id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255, nullable=false)
     */
    private $name;

    /**
     * @ORM\OneToMany(targetEntity="Exploit", mappedBy="author")
     */
    protected $exploits;

    public function __construct()
    {
        $this->exploits = new ArrayCollection();
    }

    public function addExploit(\AppBundle\Entity\Exploit $exploit)
    {
        $this->report[] = $exploit;
    }

    public function getExploits()
    {
        return $this->exploits;
    }
     /**
     * Set name
     *
     * @param string $name
     *
     * @return Type
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

}

::::::::::::::
Category.php
::::::::::::::
<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Exploit;

/**
 * Category
 *
 * @ORM\Table(name="category")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\CategoryRepository")
 */
class Category
{
    /**
     * @var integer
     *
     * @ORM\Column(name="c_id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $c_id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255, nullable=false)
     */
    private $name;

/**
     * @ORM\OneToMany(targetEntity="Exploit", mappedBy="category")
     */
    protected $exploits;

    public function __construct()
    {
        $this->exploits = new ArrayCollection();
    }

    public function addExploit(\AppBundle\Entity\Exploit $exploit)
    {
        $this->report[] = $exploit;
    }

    public function getExploits()
    {
        return $this->exploits;
    }

    /**
     * Set name
     *
     * @param string $name
     *
     * @return Type
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

}

::::::::::::::
Exploit.php
::::::::::::::
<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Author;

/**
 * Exploit
 *
 * @ORM\Table(name="exploit")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\ReportRepository")
 */
class Exploit
{
   /**
     * @var integer
     *
     * @ORM\Column(name="e_id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $e_id;

  /**
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Author", inversedBy="exploi
ts")
     * @ORM\JoinColumn(name="author_id", referencedColumnName="a_id")
     */
    protected $author;

    public function setAuthor(\AppBundle\Entity\Author $author)
    {
        $this->author = $author;
    }

    public function getAuthor()
    {
        return $this->author;
    }

      /**
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Category", inversedBy="expl
oits")
     * @ORM\JoinColumn(name="category_id", referencedColumnName="c_id")
     */
    protected $category;

    public function setCategory(\AppBundle\Entity\Category $category)
    {
        $this->category = $category;
    }

    public function getCategory()
    {
        return $this->category;
    }

      /**
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Type", inversedBy="exploits
")
     * @ORM\JoinColumn(name="type_id", referencedColumnName="t_id")
     */
    protected $type;

    public function setType(\AppBundle\Entity\Type $type)
    {
        $this->type = $type;
    }

    public function getType()
    {
        return $this->type;
    }

    /**
     * @var string
     *
     * @ORM\Column(name="edb_id", type="string", length=100, nullable=false)
     */
    private $edbId;

    /**
     * @var \DateTime
     *
     * @ORM\Column(name="date", type="datetime", nullable=false)
     */
    private $date;


    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255, nullable=false)
     */
    private $name;
  /**
     * @var string
     *
     * @ORM\Column(name="version", type="string", length=255, nullable=false)
     */
    private $version;
      /**
     * @var string
     *
     * @ORM\Column(name="content", type="text", nullable=false)
     */
    private $content;

    /**
     * @var string
     *
     * @ORM\Column(name="dork", type="string", length=255, nullable=true)
     */
    private $dork;

    /**
     * @var string
     *
     * @ORM\Column(name="software_link", type="string", length=255, nullable=tru
e)
     */
    private $softwareLink;

    /**
     * @var string
     *
     * @ORM\Column(name="tested_on", type="string", length=255, nullable=true)
     */
    private $testedOn;

     /**
     * Set edbId
     *
     * @param integer $edbId
     *
     * @return Exploit
     */
    public function setEdbId($edbId)
    {
        $this->edbId = $edbId;

        return $this;
    }

    /**
     * Get edbId
     *
     * @return integer
     */
    public function getEdbId()
    {
        return $this->edbId;
    }

    /**
     * Set date
     *
     * @param \DateTime $date
     *
     * @return Exploit
     */
    public function setDate($date)
    {
        $this->date = $date;

        return $this;
    }

    /**
     * Get date
     *
     * @return \DateTime
     */
    public function getDate()
    {
        return $this->date;
    }
/**
     * Set name
     *
     * @param string $name
     *
     * @return Exploit
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }
 /**
     * Set version
     *
     * @param string $version
     *
     * @return Exploit
     */
    public function setVersion($version)
    {
        $this->version = $version;

        return $this;
    }

    /**
     * Get version
     *
     * @return string
     */
    public function getVersion()
    {
        return $this->version;
    }
/**
     * Set content
     *
     * @param string $content
     *
     * @return Exploit
     */
    public function setContent($content)
    {
        $this->content = $content;

        return $this;
    }

    /**
     * Get content
     *
     * @return string
     */
    public function getContent()
    {
        return $this->content;
    }

    /**
     * Set dork
     *
     * @param string $dork
     *
     * @return Exploit
     */
    public function setDork($dork)
    {
        $this->dork = $dork;

        return $this;
    }

    /**
     * Get dork
     *
     * @return string
     */
    public function getDork()
    {
        return $this->dork;
    }

    /**
     * Set softwareLink
     *
     * @param string $softwareLink
     *
     * @return Exploit
     */
    public function setSoftwareLink($softwareLink)
    {
        $this->softwareLink = $softwareLink;

        return $this;
    }

    /**
     * Get softwareLink
     *
     * @return string
     */
    public function getSoftwareLink()
    {
        return $this->softwareLink;
    }

    /**
     * Set testedOn
     *
     * @param string $testedOn
     *
     * @return Exploit
     */
    public function setTestedOn($testedOn)
    {
        $this->testedOn = $testedOn;

        return $this;
    }

    /**
     * Get testedOn
     *
     * @return string
     */
    public function getTestedOn()
    {
        return $this->testedOn;
    }

    /**
     * Get e_id
     *
     * @return integer
     */
    public function gete_id()
    {
        return $this->e_id;
    }




}

::::::::::::::
Type.php
::::::::::::::
<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use AppBundle\Entity\Exploit;

/**
 * Type
 *
 * @ORM\Table(name="type")
 * @ORM\Entity(repositoryClass="AppBundle\Repository\TypeRepository")
 */
class Type
{
    /**
     * @var integer
     *
     * @ORM\Column(name="t_id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $t_id;

   /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255, nullable=false)
     */
    private $name;
/**
     * @ORM\OneToMany(targetEntity="Exploit", mappedBy="type")
     */
    protected $exploits;

    public function __construct()
    {
        $this->exploits = new ArrayCollection();
    }

    public function addExploit(\AppBundle\Entity\Exploit $exploit)
    {
        $this->report[] = $exploit;
    }

    public function getExploits()
    {
        return $this->exploits;
    }


    /**
     * Set name
     *
     * @param string $name
     *
     * @return Type
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

}

This view:

 {% for exploit in exploits %}
            <tr> 
                <th scope="row">{{ exploit.e_id }}</th> 
                <td>{{ exploit.name }}</td> 
                <td> {{ exploit.author.name }} </td>
                <td> {{ exploit.category.name }} </td>
                <td> {{ exploit.type.name }} </td>

                <td>
                    <a href="/details/{{ exploit.e_id }}" class="btn btn-success">View</a>
                    <a href="/edit/{{ exploit.e_id }}" class="btn btn-default">Edit</a>
                    <a href="/delete/{{ exploit.e_id }}" class="btn btn-danger">Delete</a>
                </td> 
            </tr> 
            {% endfor %}

And controller:

$exploits = $this->getDoctrine()
    ->getRepository('AppBundle:Exploit')
    ->findAll();

return $this->render('exploit/index.html.twig', array(
    'exploits' => $exploits
));

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Symfony3 - Entities don't work with relations

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