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How to filter array in subdocument with MongoDB [duplicate]
...use $group to put it back together:
db.test.aggregate([
{ $match: {_id: ObjectId("512e28984815cbfcb21646a7")}},
{ $unwind: '$list'},
{ $match: {'list.a': {$gt: 3}}},
{ $group: {_id: '$_id', list: {$push: '$list.a'}}}
])
outputs:
{
"result": [
{
"_id": ObjectId("512...
未能从“const std::string”为“const std::_Tree &”推导 模板 参数 - C/...
未能从“const std::string”为“const std::_Tree &”推导 模板 参数参考：http: www tsingfun com html 2016 dev_0630 1876 html参考：https://www.tsingfun.com/it/cpp/1876.htmlstl 模板 参数
How to completely remove a dialog on close
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If you are using a div from the DOM, so not dynamically created, use .empty(). Then you can reuse it, if you fill the contents again offcourse.
– KoalaBear
Jul 15 '13 at 21:14
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Difference between app.all('*') and app.use('/')
Is there a useful difference between app.all('*', ... ) and app.use('/', ...) in Node.JS Express?
7 Answers
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How to paste text to end of every line? Sublime 2
...-zA-z0-9!@#$")(*&!+_-] will find the beginning of every line (provided all characters are added for the regex to search for at the beginning each of the lines). Thanks @yohann !
– Tony H.
May 22 '12 at 21:25
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How do I make CMake output into a 'bin' dir?
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How to make it apply to all configurations at once?
– emlai
May 23 '15 at 21:24
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Sort a list by multiple attributes?
... how, you can wrap your criteria (functions) in parenthesis:
s = sorted(my_list, key=lambda i: ( criteria_1(i), criteria_2(i) ), reverse=True)
share
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improve this answer
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C++ wait for user input [duplicate]
...gtao No, it doesn't. Please compile an application on Linux/Unix making a call to system("pause") and see for yourself. I am not talking about the system()( function. But the use of "pause" as a command.
– Zimano
Jan 29 '16 at 14:51
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Auto code completion on Eclipse
I want Eclipse to automatically suggest to me all possible options, while I'm writing some variable/class name or keyword, like in Flash Develop or Visual Studio.
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Could not find method compile() for arguments Gradle
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Looking back all this time, this is the most likely problem I was having. I have since obviously far moved on, but after getting notifications that this question was still open I think its only proper to indicate this as the 'correct' ans...