MongoDB Facet Error 管道需要文本分数元数据,但没有可用的文本分数 [英] MongoDB Facet Error pipeline requires text score metadata, but there is no text score available
问题描述
我创建了一个 mongodb 分面管道,以下是其子集:
I created a mongodb faceted pipeline that the following is a subset of:
db.books.aggregate( [
{
$facet: {
"categories": [
{
$match: {
$text: { $search: "Pattern" }
}
},
{
$group: {
_id: "$Category",
count: {
$sum: 1
}
}
},
{
$sort: {
"count": -1
}
},
{
$project: {
"score": { "$meta": "textScore"},
"Category": "$_id",
"_id": 0,
"count": 1
}
},
{
$limit: 10
}
]
}
}
])
管道中除了类别之外还存在两个其他输出字段,但类似于上面管道中概述的结构.每当我运行此管道时,我都会收到错误消息:管道需要文本分数元数据,但没有可用的文本分数"
Two other output fields exist in the pipeline aside from category but resemble the structure outlined in the pipeline above. Whenever I run this pipeline I get the error: "pipeline requires text score metadata, but there is no text score available"
此错误仅在使用分面管道时发生.单独运行每个管道阶段可以完美地工作.
This error only happens when using a facet pipeline. Running each pipeline stage individually works perfectly.
如果您对此有任何想法,请不要犹豫,分享
谢谢!
推荐答案
此问题已在 groups.google.com/forum/#!topic/mongodb-user/Amozaj74prI
总而言之,需要的是匹配阶段出现在管道的开头,而不是出现在每个方面的阶段:
In summary, what was needed was the match stage to appear at the beginning of the pipeline instead of it being in every facet stage:
db.books.aggregate( [
{ $match: {$text: {$search: "Pattern"}}},
{ $addFields: {score: {$meta: "textScore"}}},
{ $facet: ... }
])
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