Question

我试图在我的colloection中使用聚合框架搜索“credit”这个词，但是我有一个错误。任何人都可以帮助弄清问题是什么。

 db.complaints.createIndex({issue:1})

    db.complaints.aggregate([
{$match:{$text:{$search:"credit"}}},
{$project:{issue:1,_id:0}}
])

我遇到了这个错误：

    assert: command failed: {
        "errmsg" : "exception: error processing query: ns=customers.complaints l
imit=0 skip=0\nTree: TEXT : query=credit, language=, tag=NULL\nSort: {}\nProj: {
 $textScore: { $meta: \"textScore\" }, issue: 1, _id: 0 }\n planner returned err
or: need exactly one text index for $text query",
        "code" : 2,
        "ok" : 0
} : aggregate failed
Error: command failed: {
        "errmsg" : "exception: error processing query: ns=customers.complaints l
imit=0 skip=0\nTree: TEXT : query=credit, language=, tag=NULL\nSort: {}\nProj: {
 $textScore: { $meta: \"textScore\" }, issue: 1, _id: 0 }\n planner returned err
or: need exactly one text index for $text query",
        "code" : 2,
        "ok" : 0
} : aggregate failed
    at Error (<anonymous>)
    at doassert (src/mongo/shell/assert.js:11:14)
    at Function.assert.commandWorked (src/mongo/shell/assert.js:254:5)
    at DBCollection.aggregate (src/mongo/shell/collection.js:1278:12)
    at (shell):1:15
2015-09-01T17:10:45.512+0100 E QUERY    Error: command failed: {
        "errmsg" : "exception: error processing query: ns=customers.complaints l
imit=0 skip=0\nTree: TEXT : query=credit, language=, tag=NULL\nSort: {}\nProj: {
 $textScore: { $meta: \"textScore\" }, issue: 1, _id: 0 }\n planner returned err
or: need exactly one text index for $text query",
        "code" : 2,
        "ok" : 0
} : aggregate failed
    at Error (<anonymous>)
    at doassert (src/mongo/shell/assert.js:11:14)
    at Function.assert.commandWorked (src/mongo/shell/assert.js:254:5)
    at DBCollection.aggregate (src/mongo/shell/collection.js:1278:12)
    at (shell):1:15 at src/mongo/shell/assert.js:13

Answer 1

如果你看一下你的错误信息，你会看到以下消息：只需要一个文本索引用于$ text查询。

您的帖子显示您确实在issue上创建了索引。但是，您似乎没有为您的收藏集声明Text Index。

如果您希望issue文档字段可以搜索文本，请按如下方式创建文本索引：

 db.complaints.createIndex({issue:"text"})

（注意，每个集合可能只有一个文本索引。但是，文本索引中包含的字段是在创建索引时建立的。再次参见上面提到的文本索引链接。）

Answer 2

此查询将起作用：

db.things.aggregate([{$match:{issue:"credit"}},{$project:{issue:1,_id:0}}])

具有错误消息的mongoDB聚合

2 个答案: