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Update MongoDB field using value of another field
...or which is an alias for $addFields. I will use $set here as it maps with what we are trying to achieve.
db.collection.<update method>(
{},
[
{"$set": {"name": { "$concat": ["$firstName", " ", "$lastName"]}}}
]
)
MongoDB 3.4+
In 3.4+ you can use $addFields and the $out...
Can I write a CSS selector selecting elements NOT having a certain class or attribute?
...ts that do have the "printable" class. If even that isn't feasible despite what you say about your actual markup, you may have to work your markup around that limitation.
Keep in mind that, depending on the properties you're setting in this rule, some of them may either be inherited by descendants ...
Why should we typedef a struct so often in C?
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What's more amazing is that 13 months after this answer is given, I'm the first to upvote it! typedef'ing structs is one of the greatest abuses of C, and has no place in well-written code. typedef is useful for de-obfuscati...
Should I always use a parallel stream when possible?
...now, if this is how parallel Java streams work, I'm just trying to clarify what JBNizet meant.)
– tomorrow
Nov 17 '16 at 15:37
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Testing two JSON objects for equality ignoring child order in Java
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The NON_EXTENSIBLE compare mode is exactly what I was looking for. Thanks for this, Dan.
– ThoughtCrhyme
Dec 13 '13 at 18:51
1
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Visual Studio move project to a different folder
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That's what I did, but I thought there is a way to do all that without removing the whole project, which makes me then re-add all the dependencies.
– Egor Pavlikhin
Apr 12 '10 at 21:48
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Send data from activity to fragment in Android
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What about Object insted of string or int?
– Dario
Feb 6 '18 at 10:19
2
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Is there a better way to express nested namespaces in C++ within the header
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Ok, so what about Windows::UI::Xaml and Windows::UI::Xaml::Controls::Primitives namespaces in Win8 development? I think Microsoft's usage of namespaces makes sense and it is indeed deeper than just 2 Levels.
– ...
Mercurial error: abort no username supplied
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The big problem for me (and what brought me to this question) was the fact none of this is mentioned on the quick start page: mercurial.selenic.com/quickstart/#. That page implies that a basic install followed by following the instructions will work, an...
surface plots in matplotlib
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But what do you do when z is an independent variable and not a function of x and y?
– Labibah
Apr 9 '15 at 20:57
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