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What's the $unwind operator in MongoDB?
...g and obtaining the data from your storage locations.
That being said, in order to understand the concept behind the $unwind parameter, you first must understand what the use case that you are trying to quote is saying. The example document from mongodb.org is as follows:
{
title : "this is my ti...
How to append one file to another in Linux from the shell?
...w-zero-length file onto itself. This makes sense when you think about the order in which the operations could and should occur but is subtle enough that it catches many people by surprise. So if nothing else, eumiro and you have prompted a further improvement to the answer. Thanks for that!
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How to sort a list in Scala by two fields?
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@SachinK: you have to create your own Ordering for Row class and use it with sorted method like this: rows.sorted(customOrdering). You could also use custom Ordering for Tuple2 like this: rows.sortBy(r => (r.lastName, r.firstName))( Ordering.Tuple2(Ordering.St...
Developing C# on Linux
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Detect If Browser Tab Has Focus
... API without a prefix for a while now. I kept Microsoft specific prefix in order to stay compatible with IE10.
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Passing a std::array of unknown size to a function
...y is that its size is part of its type, so you'd have to use a template in order to implement a function that takes an std::array of arbitrary size.
gsl::span on the other hand stores its size as run-time information. This allows you to use one non-template function to accept an array of arbitrary...
do { … } while (0) — what is it good for? [duplicate]
..., you don't get to choose how other people are going to use your macro. In order to avoid unexpected surprises inflicted upon your users, you have to use a technique like the above to make your macro behave as any other C statement would behave.
– Greg Hewgill
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Makefile, header dependencies
...n the object files, when it should obviously be on the sources and had the order of dependency wrong for the two targets, too. That's what I get for typing from memory. Try it now.
– dmckee --- ex-moderator kitten
Aug 23 '11 at 21:15
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Can't find Request.GetOwinContext
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You may need to add the NuGet package Microsoft.Owin.Host.SystemWeb in order to do this:
HttpContext.Current.GetOwinContext().GetUserManager<ApplicationUserManager>();
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The order of keys in dictionaries
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You could use OrderedDict (requires Python 2.7) or higher.
Also, note that OrderedDict({'a': 1, 'b':2, 'c':3}) won't work since the dict you create with {...} has already forgotten the order of the elements. Instead, you want to use Order...