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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?
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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,...
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...
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 .
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How To: Best way to draw table in console app (C#)
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12 Answers
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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...
HTML5 canvas ctx.fillText won't do line breaks?
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edited Feb 2 '19 at 17:39
Neuron
3,54333 gold badges2323 silver badges4040 bronze badges
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