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Question

假设这个模式：

• 类别（ID，名称）
• 文章（id、categoryId、writerId、标题、内容）
• 作家（身份证、姓名、年龄、地点）

如果我从类别级别开始，我希望能够获得由特定作家撰写的所有文章。即分类>作者>文章，文章应该只属于该分类。

类别型号：

class Category extends ActiveRecord
{
    ...
    public function getArticles()
    {
        return $this->hasMany(Article::className(), ['categoryId' => 'id']);
    }

    public function getWriters()
    {
        return $this->hasMany(Writer::className(), ['id' => 'writerId'])->via('articles');
    }
}

作家型号：

class Writer extends ActiveRecord
{
    ...
    public function getArticles()
    {
        return $this->hasMany(Article::className(), ['writerId' => 'id']);
    }

    public function getCategories()
    {
        return $this->hasMany(Category::className(), ['id' => 'categoryId'])->via('articles');
    }
}

文章型号：

class Article extends ActiveRecord
{
    ...
    public function getCategory()
    {
        return $this->hasOne(Category::className(), ['id' => 'categoryId']);
    }

    public function getWriter()
    {
        return $this->hasOne(Writer::className(), ['id' => 'writerId']);
    }
}

如果我执行以下操作：

$category = Category::find()->with(['writers'])->where(['id' => 1])->one();
var_dump($category->writers[0]->articles);

所有writers[0]将被退回的文章，无论类别。我如何让它只返回 category.id = 1。

Answer 1

尝试这个

$category = Category::find()->where(['id' => 1])->one();
if ($category !== null) {
    $articles = $category->articles;
    if ($articles !== null) {
        foreach ($articles as $article) {
            if ($article->writer !== null) {
                var_dump($article->writer);
            }
        }
    }
}

Answer 2

我无法对其进行测试，但它可能看起来类似于：

$writers = Category::find()->where(['id' => $id])->one()->getWriters()->all();
$articles = [];
foreach ($writers as $writer) {
  $articles[] = $writer->getArticles()->all();
}