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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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converting drawable resource image into bitmap
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answered Jan 3 '12 at 19:14
poitroaepoitroae
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django - query filter on manytomany is empty
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2 Answers
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How to set up Android emulator proxy settings
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20 Answers
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How can you find and replace text in a file using the Windows command-line environment?
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Using Emacs to recursively find and replace in text files not already open
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edited Sep 12 '17 at 12:42
siegy22
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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
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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,...