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mongo group query how to keep fields
...t suggestions]
I came here looking for an answer but wasn't happy with the selected answer (especially given it's age). I found this answer that is a better solution (adapted):
db.test.aggregate({
$group: {
_id: '$name',
person: { "$first": "$$ROOT" },
count: { $sum: 1 }
},
{
"$r...
Best introduction to C++ template metaprogramming? [closed]
...ile-Time Assertions", 2.4 "Mapping Integral Constants to Types", 2.6 "Type Selection", 2.7 "Detecting Convertibility and Inheritance at Compile Time", 2.9 "NullType and EmptyType" and 2.10 "Type Traits".
The best intermediate/advanced resource I've found is C++ Template Metaprogramming by David Abr...
Java Keytool error after importing certificate , “keytool error: java.io.FileNotFoundException & Acc
... to fix this problem.
Right click on cacerts > choose properties > select Securit tab > Allow all permissions to all the Group and user names.
This worked for me.
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How can I show line numbers in Eclipse?
...r and @voidstate mentioned you can now simply:
Right click the gutter and select "Show Line Numbers":
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Is background-color:none valid CSS?
...or none is not a background-color value : none
transparent may have been selected as better term instead of 0 or none values during the development of specification of CSS.
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Can't update Macports (with Mac OS X Mavericks)
...
Install the "Command Line Tools" first:
sudo xcode-select --install
(Explicitly agreeing to the license is sometimes necessary via "sudo xcodebuild -license")
Then upgrade the ports:
sudo port -v selfupdate
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Android Studio: Where is the Compiler Error Output Window?
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For Android Studio 3.1, select the icon below the Build one in the Build window.
By Android Studio 3.3 (possibly in 3.2.1), the icon has changed, though the location is the same:
The build window should open when you run a build action (e.g. f...
How to add a “readonly” attribute to an ?
...to blank/empty string, so if you have have any CSS that uses the attribute selector for [readonly="readonly"], then you'll have to change this to [readonly] (or include both).
– Luke
Oct 28 '13 at 19:58
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Android dismiss keyboard
...ll on the screen, for example click away from EditText to text that can be selected but not edited in the same window.
– Georgie
Jan 22 '19 at 2:17
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How to find reason of failed Build without any error or warning
...
Build + Intellisense swallowed the error messages.
Selecting Build Only displayed them.
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