如果未應用所有過濾器怎么辦？ 在 DOC 中使用 null 字段值而不是 NULL 值過濾

Question

我有搜索主題。 教師可以添加多個科目，學生可以搜索這些科目並可以對結果數據應用過濾器。 學生可以按級別、課程、位置進行篩選。

我的查詢是如果學生沒有應用 LOCATION 過濾器怎么辦？

我在過濾器中傳遞位置字符串對我來說一切正常..但是當我不應用位置過濾器時..它給了我沒有為文本查詢指定的文本。

這是我的查詢：

$client = ClientBuilder::create()->build();
$location = $request->location;
$level = $request->level;
$curriculum = $request->curriculum;
$params = [
    'index' => 'tutors',
    'body'  => 
    [
        "query" => [
            "bool" => [
                "must" => [
                    [ "term" => [ "approved" => 1 ]],
                    [ "match" => [ "country_en_name" =>  $location ]],
                    [ "match" => [ "local_rates.levels" =>  $level ]],
                    [ "match" => [ "local_rates.curriculums" =>  $curriculum ]],
                ]
            ],
        ]
    ]
];
$search = $client->search($params);

我也嘗試過這樣的 NULL 或 EMPTY 值

$client = ClientBuilder::create()->build();
$location = $request->location;
$level = $request->level;
$curriculum = $request->curriculum;
$params = [
    'index' => 'tutors',
    'body'  => 
    [
        "query" => [
            "bool" => [
                "must" => [
                    [ "term" => [ "approved" => 1 ]],
                    $location && $location != null ? [ "match" => [ "country_en_name" =>  $location ]] : '',
                    $level && $level != null ? [ "match" => [ "local_rates.levels" =>  $level ]] : '',
                    $curriculum && $curriculum != null ? [ "match" => [ "local_rates.curriculums" =>  $curriculum ]] : '',
                ]
            ],
        ]
    ]
];
$search = $client->search($params);

但是沒有用，誰能幫幫我？

Answer 1

您不能在bool/must查詢中添加空查詢。 您需要逐步構建查詢：

$params = [
    'index' => 'tutors',
    'body'  => 
    [
        "query" => [
            "bool" => [
                "must" => [
                    [ "term" => [ "approved" => 1 ]],
                ]
            ],
        ]
    ]
];

if ($location && $location != null) {
   $params['body']['query']['bool']['must'][] = [ "match" => [ "country_en_name" =>  $location ]];
}
if ($level && $level != null) {
   $params['body']['query']['bool']['must'][] = [ "match" => [ "local_rates.levels" =>  $level ]];
}
if ($curriculum && $curriculum != null) {
   $params['body']['query']['bool']['must'][] = [ "match" => [ "local_rates.curriculums" =>  $curriculum ]];
}


$search = $client->search($params);