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Update MongoDB field using value of another field
..."name": { "$concat": ["$firstName", " ", "$lastName"]}}}
]
)
MongoDB 3.4+
In 3.4+ you can use $addFields and the $out aggregation pipeline operators.
db.collection.aggregate(
[
{ "$addFields": {
"name": { "$concat": [ "$firstName", " ", "$lastName" ] }
}},
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Can I keep Nuget on the jQuery 1.9.x/1.x path (instead of upgrading to 2.x)?
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edited Apr 30 '13 at 18:31
answered Apr 22 '13 at 16:03
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What is the purpose of the '@' symbol in CSS?
... it's arguably becoming increasingly common in the recent @media (CSS2, CSS3) and @font-face (CSS3) constructs. The @ syntax itself, though, as I mentioned, is not new.
These are all known in CSS as at-rules. They're special instructions for the browser, not directly related to styling of (X)HTML/X...
Search an Oracle database for tables with specific column names?
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edited Mar 3 '16 at 17:35
answered Dec 23 '09 at 15:06
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How to initialize an array's length in JavaScript?
Most of the tutorials that I've read on arrays in JavaScript (including w3schools and devguru ) suggest that you can initialize an array with a certain length by passing an integer to the Array constructor using the var test = new Array(4); syntax.
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Can I get a list of files marked --assume-unchanged?
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answered Mar 2 '10 at 13:48
Andrew AylettAndrew Aylett
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SQL Group By with an Order By
...oyesScott Noyes
2,11611 gold badge1212 silver badges33 bronze badges
9
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Does the join order matter in SQL?
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231
For INNER joins, no, the order doesn't matter. The queries will return same results, as long as...
Using emit vs calling a signal as if it's a regular function in Qt
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3 Answers
3
Active
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dealloc in Swift
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334
deinit {
// perform the deinitialization
}
From the Swift Documentation:
A deinitial...