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Delete a key from a MongoDB document using Mongoose

...collection.update({_id: user._id}, {$unset: {field: 1 }}); Since version 2.0 you can do: User.update({_id: user._id}, {$unset: {field: 1 }}, callback); And since version 2.4, if you have an instance of a model already you can do: doc.field = undefined; doc.save(callback); ...
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How to retrieve all keys (or values) from a std::map and put them into a vector?

... | edited Aug 21 at 16:47 Srijan Chaudhary 34811 gold badge33 silver badges1414 bronze badges ...
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How to elegantly ignore some return values of a MATLAB function?

... a hack but it works: First a quick example function: Func3 = @() deal(1,2,3); [a,b,c]=Func3(); % yields a=1, b=2, c=3 Now the key here is that if you use an variable twice in the left hand side of a multiple-expression assignment, an earlier assignment is clobbered by the later assignment: [b,...
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Why is a div with “display: table-cell;” not affected by margin?

...s="table"> <div class="row"> <div class="cell">123</div> <div class="cell">456</div> <div class="cell">879</div> </div> </div> CSS .table {display:table;border-collapse:separate;border-spacing:5px;} .row {dis...
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How to set up Android emulator proxy settings

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Formatting Phone Numbers in PHP

...SMS app and need to be able to convert the sender's phone number from +11234567890 to 123-456-7890 so it can be compared to records in a MySQL database . ...
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How to install python3 version of package via pip on Ubuntu?

I have both python2.7 and python3.2 installed in Ubuntu 12.04 . The symbolic link python links to python2.7 . 17 ...
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How To: Best way to draw table in console app (C#)

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How to have no pagebreak after \include in LaTeX

...aft or production version production make targets. \includeonly{file1,file2,...} allows to specify a list of source files called with \include{file1} (where file1 is an example) that will show in the resulting document. The others will not show up, but are considered for counters, labels, tables of...
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HTML5 canvas ctx.fillText won't do line breaks?

... | edited Feb 2 '19 at 17:39 Neuron 3,54333 gold badges2323 silver badges4040 bronze badges ...