在mongodb中计算全文搜索的相关结果

评分算法是MongoDB内部的,可能会随着时间的推移而变化,因此精确的值应该无关紧要。您可以通过查看 sources

最终分数取决于搜索词(或词干)的出现次数、匹配之间的距离、匹配质量(完全匹配与部分匹配)、语言设置和权重 configure . 这些都是很重要的东西,很难记录下来。然而,有一篇博客文章很好地解释了一些方面: https://blog.codecentric.de/en/2013/01/text-search-mongodb-stemming/

最后,如果你想知道是否有一个完美的匹配,我能想到的唯一方法是这样做:

db.getCollection('test').aggregate(
{
    // do the normal filtering query
    $match: {
        $text: {
            $search: "mitsubishi lancer 2011"
        }
    }
}, {
    // select what's relevant in the output and add an indicator "perfectmatch"
    $project: {
        "text": 1,
        "score": {
            $meta: "textScore"
        },
        "perfectmatch": {
            $cond: [
                { $eq: [ "$text", "mitsubishi lancer 2011" ] }, // this would check for a perfect match using the exact full string, for individual token matching you would need to do tokenize your query and do a series of other checks here.
                true,
                false
            ]
        }
    }
}, {
    // if you want to have the results sorted by "best match first"
    $sort: {
        "score": -1
    }
})