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What's the $unwind operator in MongoDB?

...ad" } ], other : { foo : 5 } } Notice how tags is actually an array of 3 items, in this case being "fun", "good" and "fun". What $unwind does is allow you to peel off a document for each element and returns that resulting document. To think of this in a classical approach, it would be the equiv...
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When to use a “has_many :through” relation in Rails?

...e it (and how). However, I am not getting it. I am reading Beginning Rails 3 and I tried Googling, but I am not able to understand. ...
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What does the double colon (::) mean in CSS?

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How do you input commandline argument in IntelliJ IDEA?

... 236 Windows, Linux, some Macs: ALT+SHIFT+F10, Right, E, Enter, Tab, enter your command line parame...
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How do I verify a method was called exactly once with Moq?

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Create UIActionSheet 'otherButtons' by passing in array, not varlist

... and just add it after : NSArray *array = @[@"1st Button",@"2nd Button",@"3rd Button",@"4th Button"]; UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Title Here" delegate:self ...
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Are there legitimate uses for JavaScript's “with” statement?

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Go to first line in a file in vim?

... | edited Aug 11 '15 at 23:28 kenorb 105k4949 gold badges542542 silver badges576576 bronze badges answe...
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How can I find out what version of git I'm running?

... 234 $ git --version git version 1.7.3.4 git help and man git both hint at the available arguments...
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What is q=0.5 in Accept* HTTP headers?

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