我想从现有数据库创建我的实体，它是一个创建articlesCategories表的N-N关系。
我目前有2个实体，文章和类别，我希望有一个ManyToMany双向关系。
但是当我尝试使用findByXXX或findOneByXXX方法获取文章或类别时，我的ManyToMany属性为 NULL ，或者我有ORM例外：实体＆＃39; App \ Models \文章＆＃39;没有字段＆＃39;类别＆＃39;。因此，您无法拨打“查找”类别＆＃39;关于实体＆＃39;存储库
表文章：idArticle，名称，描述，priceHT，大小
表类别：idCategory，name，percentTaxe
表articlesCategories：idArticle，idCategory
分类
/**
* @Entity
* @Table(name="category")
*/
class Category
{
/**
* @var integer
*
* @Id
* @Column(name="idCategory", type="integer", nullable=false)
* @GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @var string
* @Column(name="name", type="string", length=45, nullable=false)
*/
private $name;
/**
* @var string
* @Column(name="percentTaxe",type="decimal", precision=10, scale=0, nullable=false)
*/
private $percentTaxe;
/*
* Many categories have many articles
* @ManyToMany(targetEntity="App\Models\Article", inversedBy="categories")
* @JoinTable(name="articlesCategories",
* joinColumns={@JoinColumn(name="idCategory", referencedColumnName="idCategory")},
* inverseJoinColumns={@JoinColumn(name="idArticle", referencedColumnName="idArticle")}
* )
*/
private $articles;
/*Constructor*/
public function __construct(){
$toto = "toto";
var_dump($toto);
$this->articles = new ArrayCollection();
}
/***************************
Getters / Setters
****************************/
public function getId(){
return $this->id;
}
public function getName(){
return $this->name;
}
public function getPercentTaxe(){
return $this->percentTaxe;
}
public function getArticles(){
return $this->articles;
}
/************************/
public function setId($id){
$this->id = $id;
}
public function setName($name){
$this->name = htmlspecialchars($name);
}
public function setPercentTaxe($percentTaxe){
$this->percentTaxe = htmlspecialchars($percentTaxe);
}
public function setArticles(\Doctrine\Common\Collections\Collection $articles)
{
$this->articles = $articles;
}
/***************************
Getters / Setters
****************************/
public function addArticle(App\Models\Article $article)
{
var_dump($article);
$article->addCategory($this); // synchronously updating inverse side
$this->articles[] = $article;
}
第
/**
* @Entity
* @Table(name="article")
*/
class Article
{
/**
* @var integer
*
* @Id
* @Column(name="idArticle", type="integer", nullable=false)
* @GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @var string
* @Column(name="name", type="string", length=45, nullable=false)
*/
private $name;
/**
* @var string
* @Column(name="description",type="string", nullable=true)
*/
private $description;
/**
* @var string
* @Column(name="priceHT",type="decimal", precision=10, scale=3, nullable=false)
*/
private $priceHT;
/**
* @var string
* @Column(name="size", type="string", length=3, nullable=true)
*/
private $size;
/*
* Many articles have many categories
* @ManyToMany(targetEntity="App\Models\Category", inversedBy="articles")
* @JoinTable(name="articlesCategories",
* joinColumns={@JoinColumn(name="idArticle", referencedColumnName="idArticle")},
* inverseJoinColumns={@JoinColumn(name="idCategory", referencedColumnName="idCategory")}
* )
*/
private $categories;
/*Constructor*/
public function __construct(){
echo"tata";
$this->categories = new ArrayCollection();
echo"tata";
}
/***************************
Getters / Setters
****************************/
public function getId(){
return $this->id;
}
public function getName(){
return $this->name;
}
public function getDescription(){
return $this->description;
}
public function getPriceHT(){
return $this->priceHT;
}
public function getSize(){
return $this->size;
}
public function getCategories(){
return $this->categories;
}
/************************/
public function setId($id){
$this->id = $id;
}
public function setName($name){
$this->name = htmlspecialchars($name);
}
public function setDescription($description){
$this->description = htmlspecialchars($description);
}
public function setPriceHT($priceHT){
$this->priceHT = htmlspecialchars($priceHT);
}
public function setSize($size){
$this->size = htmlspecialchars($size);
}
public function setCategories($categories){
$this->categories = $categories;
}
/***************************
Getters / Setters
****************************/
public function addCategory(App\Models\Category $category)
{
$category->addArticle($this); // synchronously updating inverse side
$this->categories[] = $category;
}
/************************/
public function hydrate($data)
{
foreach($data as $key => $value)
{
// Get back the setter name wich correspond to the attribute
$method = 'set'.ucfirst($key);
// if the good setter exist.
if(methodexists($this, $method))
{
$this->$method($value);
}
}
}
}
/**
* @param category : category of article we want
* @return an array of Article object or null
*/
public function getArticlesByCategory($categoryName)
{
$articles = NULL;
$repository = $this->getEntityManager()->getRepository("App\Models\Category");
$category = $repository->findOneByName($categoryName);
var_dump($category);
if($category != NULL)
{
$articles = $category->getArticles();
}
return $articles;
}
当我var_dump我的$ category时，我有： class App \ Models \ Category＃122（4）{private $ id =＆gt; int（2）private $ name =＆gt;字符串（7）＆＃34;衣服＆＃34; private $ percentTaxe =＆gt;字符串（2）＆＃34; 20＆＃34; private $ articles =＆gt; NULL}
由于Doctrine create instances of mapped entities without invoking constructor我发现我的类别和文章为空而不是空数组，但我不明白为什么它不会填充它。
我只使用Doctrine2，我不使用symfony。
答案 0 :(得分：1)
首先，您对两个实体的类别和文章字段的注释都有错误。为了有效，他们应该以/ **而不是/ *开头。更改：
/*
* Many categories have many articles
到
/**
* Many categories have many articles
条款实体的$ categories字段相同。
同时将其中一个字段（文章或类别）更改为关系的反面，例如
inversedBy="categories"
要 的mappedBy = “类别”
在你的问题的另一部分，默认的EntityRepository查找方法（findBy，findOneBy）不支持过滤多对多关系（至少还没有）。您将不得不付出额外的努力并使用 createQueryBuilder ，例如：
$qb = $doctrine->getRepository(Article::class)->createQueryBuilder('a');
$qb->select(
'a',
'cat'
)
->innerJoin( 'a.categories', 'cat' )
->where('cat.id =1');
最好创建自己的ArticleRepository和CategoryRepository，并在那里定义find方法。 7.8.8. Custom repositories