使用MongoDB查找文档,该数组包含一个字符串,该字符串是特定单词的子字符串 [英] Find documents, which array contains a string that is a substring to specific word, using MongoDB
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问题描述
假设我有这个收藏夹:
{"str": ["pho", "goa"], ...},
{"str": ["sma", "aba"], ...},
{"str": ["gag"], ...}
...
我想选择所有文档,其中的字段(此处为str
)包含一个字符串,该字符串是某个单词的子字符串.例如smartphone
.因此,查询结果应为:
And I want to select all the documents, which field (str
here) contains a string, which is a substring to some word. smartphone
for example. So the result of the query should be:
{"str": ["pho", "goa"], ...},
{"str": ["sma", "aba"], ...}
我该怎么做?
This question is related to #54279248, where you don't have to search within array.
推荐答案
您可以使用以下聚合:
db.collection.aggregate([
{
$match: {
$expr: {
$anyElementTrue: {
$map: {
input: "$str",
as: "s",
in: { $ne: [ -1, { $indexOfBytes: [ "smartphone", "$$s" ] } ] }
}
}
}
}
}
])
想法是您可以利用 $ indexOfBytes 检查"smartphone"
中包含的str
中的字符串,然后只需要使用
The idea is that you can take advantage of $indexOfBytes to check string from str
is contained in "smartphone"
and then you just need to use $anyElementTrue to check if condition is met for any item from str
Mongo游乐场此处
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