[英]Symfony2, Doctrine2, query builder with strange result values?
我正在嘗試從我的Article對象中選擇我的文章,並加入評論作為此文章的評論數。 所以我有這個構建:
$em = $this->getDoctrine()->getManager();
$query = $em->createQueryBuilder()
->select('a, COUNT(comments) AS comments_count')
->from('AcmeBlogBundle:Article', 'a')
->leftJoin('a.comments', 'comments')
->groupBy('a.id')
->orderBy('a.id', 'DESC');
$articles = $query->getQuery()->getResult();
但是我將嘗試在TWIG模板中加載我的文章列表,我將收到此錯誤:
Key "title" for array with keys "0, comments_count" does not exist in AcmeBlogBundle:Admin:index.html.twig at line 13
我的index.html.twig :
{% for article in articles %}
<tr>
<td>{{ article.title }}</td>
<td><a href="{{ path('default_blog_show', {'slug' : article.slug}) }}">Visit</a> | <a href="{{ path('admin_blog_edit', {'article_id' : article.id}) }}">Edit</a> | <a href="{{ path('admin_blog_delete', {'article_id' : article.id}) }}" onclick="return confirm('Any question...');">Delete</a></td>
</tr>
{% endfor %}
但是,查詢正常,我在分析器中對其進行了檢查:
SELECT
a0_.id AS id0,
a0_.title AS title1,
a0_.slug AS slug2,
a0_.content AS content3,
COUNT(c1_.id) AS sclr4
FROM
articles a0_
LEFT JOIN comments c1_ ON a0_.id = c1_.article_id
GROUP BY
a0_.id
ORDER BY
a0_.id DESC
如果我試圖轉儲$articles
使用\\Doctrine\\Common\\Util\\Debug::dump($articles);
屬性,我將得到以下結果:
array(1) {
[0]=>
array(2) {
[0]=>
string(30) "Acme\BlogBundle\Entity\Article"
["comments_count"]=>
string(1) "0"
}
}
您知道此查詢結果出什么問題嗎?
之所以發生這種情況,是因為學說返回了一組值。
在模板中使用它,它應該顯示標題:
<td>{{ attribute(article, 0).title }}</td>
編輯:
在您的樹枝模板中嘗試以下操作:
{% for item in articles %}
{% set article = item[0] %}
{% set comment_count = item['comments_count'] %}
<tr>
<td>{{ article.title }}</td>
<td><a href="{{ path('default_blog_show', {'slug' : article.slug}) }}">Visit</a> | <a href="{{ path('admin_blog_edit', {'article_id' : article.id}) }}">Edit</a> | <a href="{{ path('admin_blog_delete', {'article_id' : article.id}) }}" onclick="return confirm('Any question...');">Delete</a></td>
</tr>
{% endfor %}
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