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What's Mongoose error Cast to ObjectId failed for value XXX at path “_id”?

When sending a request to /customers/41224d776a326fb40f000001 and a document with _id 41224d776a326fb40f000001 does not exist, doc is null and I'm returning a 404 : ...
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Getting the first character of a string with $str[0]

I want to get the first letter of a string and I've noticed that $str[0] works great. I am just not sure whether this is 'good practice', as that notation is generally used with arrays. This feature doesn't seem to be very well documented so I'm turning to you guys to tell me if it's all right –...
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How to mock an import

Module A includes import B at its top. However under test conditions I'd like to mock B in A (mock A.B ) and completely refrain from importing B . ...
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Copy folder recursively, excluding some folders

I am trying to write a simple bash script that will copy the entire contents of a folder including hidden files and folders into another folder, but I want to exclude certain specific folders. How could I achieve this? ...
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The best way to remove duplicate values from NSMutableArray in Objective-C?

The best way to remove duplicate values ( NSString ) from NSMutableArray in Objective-C? 14 Answers ...
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mkdir -p functionality in Python [duplicate]

Is there a way to get functionality similar to mkdir -p on the shell from within Python. I am looking for a solution other than a system call. I am sure the code is less than 20 lines, and I am wondering if someone has already written it? ...
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Why would adding a method add an ambiguous call, if it wouldn't be involved in the ambiguity

I have this class 5 Answers 5 ...
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How To Format A Block of Code Within a Presentation? [closed]

I am preparing a presentation using Google Slides, though I can also work on the presentation within Open Office that will include code snippets. ...
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Make Visual Studio understand CamelCase when hitting Ctrl and cursor keys

Is there a way that I can configure Visual Studio 2008 to understand CamelCase? Specifically, I'd like to be able to get Ctrl + right or left cursor to take me to a subsection of a variable or type name. ...
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How to 'grep' a continuous stream?

Is that possible to use grep on a continuous stream? 12 Answers 12 ...