如何在 Symfony 2 和 Doctrine 中过滤实体对象内的数据

How filter data inside entity object in Symfony 2 and Doctrine

我有两个实体:ProductFeatureProduct 有许多其他 Features (一对多关系)。每个 Feature 都有一个名称和一个重要状态(如果功能重要则为 true,否则为 false)。我想在 TWIG 中获得我产品的所有重要功能。

下面的解决方案非常难看:

Product: {{ product.name }}
Important features:
{% for feature in product.features %}
    {% if feature.important == true %}
        - {{ feature.name }}
    {% endif %}
{% endfor %}

所以我想得到:

Product: {{ product.name }}
Important features:
{% for feature in product.importantFeatures %}
     - {{ feature.name }}
{% endfor %}

我必须过滤实体对象中的数据,但是如何?

// MyBundle/Entity/Vehicle.php
class Product {
    protected $features; // (oneToMany)
    // ...
    protected getFeatures() { // default method
        return $this->features;
    }
    protected getImportantFeatures() { // my custom method
        // ? what next ?
    }
}

// MyBundle/Entity/Feature.php
class Feature {
    protected $name;      // (string)
    protected $important; // (boolean)
    // ...
}

您可以从存储库中完成

$featureEntityRepository->findBy(array(
    'impoertant' => true,
    'product' => $product->getId()
));

可以使用Criteriaclass筛选出相关特征的Arraycollection

class Product {
    protected $features; // (oneToMany)
    // ...
    protected getFeatures() { // default method
        return $this->features;
    }
    protected getImportantFeatures() { // my custom method
        $criteria = \Doctrine\Common\Collections\Criteria::create()
                    ->where(\Doctrine\Common\Collections\Criteria::expr()->eq("important", true));
     return $this->features->matching($criteria);
    }
}

在树枝上

Product: {{ product.name }}
Important features:
{% for feature in product.getImportantFeatures() %}
     - {{ feature.name }}
{% endfor %}