Mongo Db按索引字段搜索 [英] Mongo Db search by indexed field

问题描述

我将字段"search_string"添加到我的文档中并为其建立索引. db.my_collection.createIndex({search_string: "text"}) Search_string包含以下内容:一个竞技场竞技场".

I add field 'search_string' to my document and index it. db.my_collection.createIndex({search_string: "text"}) Search_string contains this: 'a ar are aren arena'.

我可以找到记录:db.my_collection.find({$text: {$search: 'ar'}})，db.my_collection.find({$text: {$search: 'аren'}})，db.my_collection.find({$text: {$search: 'arenа'}})，但是db.my_collection.find({$text: {$search: 'а'}})和db.my_collection.find({$text: {$search: 'аre'}})不返回任何内容.为什么会发生?

I can find record with this: db.my_collection.find({$text: {$search: 'ar'}}), db.my_collection.find({$text: {$search: 'аren'}}), db.my_collection.find({$text: {$search: 'arenа'}}), but db.my_collection.find({$text: {$search: 'а'}}) and db.my_collection.find({$text: {$search: 'аre'}}) returns nothing. Why does it happens?

推荐答案

来自MongoDB

From the MongoDB manual

匹配操作

停词

$ text运算符会忽略特定于语言的停用词，例如and和英语.

The $text operator ignores language-specific stop words, such as the and and in English.

"a"和"are"都在默认英语停用词列表中，因此将被忽略.谷歌快速搜索英语停用词将找到大量包含完整列表的页面.

Both "a" and "are" are in the list of default English language stopwords so will be ignored. A quick google search for English language stopwords will find plenty of pages with the full list.

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