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Add new field to every document in a MongoDB collection

...field" : 1, "test" : "a" } EDIT: In case you want to add a new_field to all your collection, you have to use empty selector, and set multi flag to true (last param) to update all the documents db.your_collection.update( {}, { $set: {"new_field": 1} }, false, true ) EDIT: In the above ...
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Call ASP.NET function from JavaScript?

... Page.ClientID %>'; __doPostBack(pageId, argumentString); This will call the 'RaisePostBackEvent' method in your code file with the 'eventArgument' as the 'argumentString' you passed from the JavaScript. Now, you can call any other event you like. P.S: That is 'underscore-underscore-doPostBac...
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Align image in center and middle within div

...rtically – alpadev May 11 '17 at 14:32  |  show 1 more comment ...
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delegate keyword vs. lambda notation

... If you specify an anonymous method without specifying a parameter list at all it is compatible with any delegate type returning void and without any out parameters. Armed with this knowledge, we should be able to construct two overloads to make the expressions completely unambiguous but very differ...
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What characters are allowed in DOM IDs? [duplicate]

... Actually there is a difference between HTML and XHTML. As XHTML is XML the rules for XML IDs apply: Values of type ID MUST match the Name production. NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | ...
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Using a piano keyboard as a computer keyboard [closed]

I have RSI problems and have tried 30 different computer keyboards which all caused me pain. Playing piano does not cause me pain. I have played piano for around 20 years without any pain issues. I would like to know if there is a way to capture MIDI from a MIDI keyboard and output keyboard stroke...
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Difference between this and self in self-type annotations?

... All three forms are valid, and have the effect that B is assumed as the type of this in class A. The first two variants trait A { self: B => ... } trait A { foo: B => ... } introduce self (respectively, foo) as an ...
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GoogleTest: How to skip a test?

...o). I then removed my comment, figuring it's obsolete... but that's some really good info! +1 – Kiril Aug 26 '11 at 17:05 ...
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WKWebView not loading local files under iOS 8

... They finally solved the bug! Now we can use -[WKWebView loadFileURL:allowingReadAccessToURL:]. Apparently the fix was worth some seconds in WWDC 2015 video 504 Introducing Safari View Controller For iOS8 ~ iOS10 (Swift 3) As Da...
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Differences between utf8 and latin1

... at least 5.5 or go for another RDBMS like PostgreSQL. In MySQL 5.5+ it's called utf8mb4. share | improve this answer | follow | ...