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Update MongoDB field using value of another field

In MongoDB, is it possible to update the value of a field using the value from another field? The equivalent SQL would be something like: ...
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MySQL COUNT DISTINCT

I'm trying to collect the number of distinct visits in my cp yesterday, then count them. 3 Answers ...
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Structs in Javascript

...ference between object literals and constructed objects are the properties inherited from the prototype. var o = { 'a': 3, 'b': 4, 'doStuff': function() { alert(this.a + this.b); } }; o.doStuff(); // displays: 7 You could make a struct factory. function makeStruct(names) { var name...
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Multiple actions were found that match the request in Web Api

I keep getting this error when I try to have 2 "Get" methods 18 Answers 18 ...
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LEFT OUTER joins in Rails 3

I have the following code: 8 Answers 8 ...
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Detecting which UIButton was pressed in a UITableView

I have a UITableView with 5 UITableViewCells . Each cell contains a UIButton which is set up as follows: 26 Answers ...
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.NET unique object identifier

Is there a way of getting a unique identifier of an instance? 11 Answers 11 ...
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Selecting element by data attribute

..."]'); You should be able to omit the *, but if I recall correctly, depending on which jQuery version you’re using, this might give faulty results. Note that for compatibility with the Selectors API (document.querySelector{,all}), the quotes around the attribute value (22) may not be omitted in ...
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How to generate random SHA1 hash to use as ID in node.js?

I am using this line to generate a sha1 id for node.js: 4 Answers 4 ...
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Converting JSON data to Java object

I want to be able to access properties from a JSON string within my Java action method. The string is available by simply saying myJsonString = object.getJson() . Below is an example of what the string can look like: ...