使用聚合管道进行文本搜索 - MongoDB / PHP
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【中文标题】使用聚合管道进行文本搜索 - MongoDB / PHP【英文标题】：Text search with aggregation pipeline - MongoDB / PHP 【发布时间】：2016-08-23 18:54:41 【问题描述】：我正在尝试在 MongoDB 3.2 中使用聚合管道实现文本搜索 这就是我的 mongo 查询的样子：
db.revws.aggregate(
[
$match: $text: $search: "terrible" ,
$sort: score: $meta: "textScore" ,
$project: score: $meta: "textScore" ,'ProductInfo.ProductID' :1 , 'Reviews.Title': 1, 'Reviews.Content': 1, 'Reviews.Overall': 1,'Reviews.Author': 1, _id: 0
]
)
这在我的收藏中运行良好。生成的文档结构如下所示：
"Reviews" :
"Title" : "Terrible terrible terrible",
"Author" : "C. Leinart",
"Overall" : "1.0",
"Content" : "I love cameras - i have multiple cameras for multiple uses and this is the absolute worst ever. The quality of the prints are terrible. The paper turns sort of a bluish color. The battery life is terrible and to top it all off, i lost my charger and there is no such thing as a replacement charger in Polaroid-land. Really...you CANNOT buy a replacement charger. So if you have one of these, hang on to the charger and be prepared to only use for fun party pics - it's novel but not worth the $$."
,
"ProductInfo" :
"ProductID" : "B005O08KH6"
,
"score" : 2.53571428571429
当我尝试根据用户在 php 中的输入执行类似的文本搜索查询时。我收到一个错误“$project 规范必须是一个对象”。
这是我的 PHP 代码：
<html>
<body>
<h3>MongoDB Test - Aggregation pipeline</h3>
<h2>Text search - Amazon reviews</h2>
<br>
<form method="post">
search: <input type="text" name="term"><br><br>
<input type="submit" value="Display results">
</form>
</body>
</html>
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST")
$term = $_REQUEST['term'];
// connect to mongodb : default is localhost:27017
$m = new MongoClient();
echo "Connection to database successfully"."</br>";
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'revws');
/*
db.revws.aggregate(
[
$match: $text: $search: "terrible" ,
$sort: score: $meta: "textScore" ,
$project: score: $meta: "textScore" ,'ProductInfo.ProductID' :1 , 'Reviews.Title': 1, 'Reviews.Content': 1, 'Reviews.Overall': 1,'Reviews.Author': 1, _id: 0
]
)
*
*/
$pipeline = array (
array(
'$match' => array('$text' => array('$search'=> $term))
),
array('$sort' => array("score" => array('$meta' => "textScore"))
),
array('$project' => array( array("score" => array('$meta' => "textScore"), 'ProductInfo.ProductID' => 1,
'Reviews.Title' => 1, 'Reviews.Content' => 1 , 'Reviews.Overall' => 1, 'Reviews.Author' => 1, '_id' => 0
)
)
)
);
var_dump($pipeline);
$cursor = $collection->aggregate($pipeline);
echo "<br><br>";
echo '<table border="1"><tr><td>text score</td><td>ProductID</td><td>Review Title</td><td>Content</td><td>Author</td><td>Rating</td></tr>';
foreach ($cursor as $doc)
echo '<tr>';
echo
'<td>'.$doc['score'].'</td>'.
'<td>'.$doc['ProductInfo']['ProductID'].'</td>'.
'<td>'.$doc['Reviews']['Title'].'</td>'.
'<td>'.$doc['Reviews']['Content'].'</td>'.
'<td>'.$doc['Reviews']['Author'].'</td>'.
'<td>'.$doc['Reviews']['Overall'].'</td>';
echo '</tr>';
echo '</table>';
?>
这个php的输出是：
连接数据库成功 array(3) [0]=> array(1) ["$match"]=> 数组(1) ["$text"]=> 数组(1) ["$search"]=> 字符串(8) “可怕” [1]=> 数组（1） [“$sort”]=> 数组（1） [“分数”]=> 数组（1）[“$meta”]=>字符串（9）“textScore”[2]=>数组（1） ["$project"]=> array(1) [0]=> array(7) ["score"]=> array(1) ["$meta"]=> string(9) "textScore" ["ProductInfo.ProductID"]=> int(1) ["Reviews.Title"]=> int(1) ["Reviews.Content"]=> int(1) ["Reviews.Overall"]=> int(1) ["Reviews.Author"]=> int(1) ["_id"]=> int(0) 致命错误：未捕获的异常“MongoResultException” 带有消息 'localhost:27017: $project 规范必须是 C:\xampp\htdocs\MongoSearch\MongoSearchAggr.php:49 堆栈中的对象' 跟踪：#0 C:\xampp\htdocs\MongoSearch\MongoSearchAggr.php(49)： MongoCollection->aggregate(Array) #1 main 抛出 C:\xampp\htdocs\MongoSearch\MongoSearchAggr.php 第 49 行
我有意将 var_dump 用于显示基于 php 的 mongo 查询。 谁能指出这里的错误？ 谢谢
【问题讨论】：
【参考方案1】：你试过了吗
$pipeline = array (
array(
'$match' => array('$text' => array('$search'=> $term))
),
array('$sort' => array("score" => array('$meta' => "textScore"))
),
array('$project' => array("score" => array('$meta' => "textScore"), 'ProductInfo.ProductID' => 1,
'Reviews.Title' => 1, 'Reviews.Content' => 1 , 'Reviews.Overall' => 1, 'Reviews.Author' => 1, '_id' => 0
)
)
);
我刚刚从 $project 中删除了一个额外的数组
【讨论】：
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