我正在使用 Laravel 5.5。我寫了一個包裝器，它采用 Eloquent 模型并將其包裝到一個Entity類中，每個模型都有自己的包裝器。假設(shè)，用戶有很多產(chǎn)品，一個產(chǎn)品屬于一個用戶。包裝時，我需要獲取用戶的產(chǎn)品并將它們傳遞給產(chǎn)品包裝器以將它們包裝到產(chǎn)品實體中。在產(chǎn)品包裝器中，我需要讓該產(chǎn)品的用戶所有者將其包裝到用戶實體。所以，再次，在用戶包裝器中，我需要用戶產(chǎn)品！，這會創(chuàng)建一個無限循環(huán)。實體包裝器：abstract class EntityWrapper{ protected $collection; protected $entityClass; public $entity; public function __construct($collection) { $this->collection = $collection; $this->entity = $this->buildEntity(); } protected function buildEntity() { $tempEntity = new $this->entityClass; $Entities = collect([]); foreach ($this->collection as $model) { $Entities->push($this->makeEntity($tempEntity, $model)); } return $Entities; } abstract protected function makeEntity($entity, $model);}用戶實體包裝器：class UserEntityWrapper extends EntityWrapper{ protected $entityClass = UserEntity::class; protected function makeEntity($userEntity, $model) { $userEntity->setId($model->user_id); $userEntity->setName($model->name); // set other properties of user entity... //--------------- relations ----------------- $userEntity->setProducts((new ProductEntityWrapper($model->products))->entity); return $userEntity; }}產(chǎn)品實體包裝器：class ProductEntityWrapper extends EntityWrapper{ protected $entityClass = ProductEntity::class; protected function makeEntity($productEntity, $model) { $productEntity->setId($model->product_id); $productEntity->setName($model->name); // set other properties of product entity... //--------------- relations ----------------- $productEntity->setUser((new UserEntityWrapper($model->user))->entity); return $productEntity; }}
1 回答
婷婷同學(xué)_
TA貢獻(xiàn)1844條經(jīng)驗 獲得超8個贊
最后我找到了解決方案。在每個包裝類中，我使用動態(tài)屬性來獲取關(guān)系集合，除了強(qiáng)加額外的查詢外，這會導(dǎo)致延遲加載。因此，在將模型集合傳遞給每個包裝器之前，檢索必要的關(guān)系模型，每個包裝器首先使用方法getRelations()（返回可用關(guān)系數(shù)組）檢查關(guān)系是否存在。如果預(yù)期關(guān)系可用，則將關(guān)系模型集合傳遞到適當(dāng)?shù)陌b類中。
用戶實體包裝器：
class UserEntityWrapper extends EntityWrapper
{
protected $entityClass = UserEntity::class;
protected function makeEntity($userEntity, $model)
{
$userEntity->setId($model->user_id);
$userEntity->setName($model->name);
// set other properties of user entity...
//--------------- relations -----------------
$relations = $model->getRelations();
$products = $relations['products'] ?? null;
if ($products) {
$userEntity->setProducts((new ProductEntityWrapper($products))->entity);
}
return $userEntity;
}
}
并且，類似的功能用于其他包裝器。
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