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find() with nil when there are no records

... Yes, just do: Challenge.find_by_id(10) For Rails 4 and 5: Challenge.find_by(id: 10) share | improve this answer | follow | ...
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Pandas - How to flatten a hierarchical index in columns

... 496 I think the easiest way to do this would be to set the columns to the top level: df.columns =...
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Xcode 4 - build output directory

I have problems with setting up/locating my output files in Xcode4 (beta 5). They are placed somewhere in ~/Library/Developer/ugly_path/... . I can't even select "show in finder" on my products. It is the same for a simple C project, Foundation tool and even Cocoa bundle. A Debugging works fine. ...
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“Remote System Explorer Operation” causing freeze for couple of seconds

... answered Mar 28 '16 at 9:14 Q9703Q9703 23622 silver badges33 bronze badges ...
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Ruby on Rails: Where to define global constants?

... Holger JustHolger Just 43.4k1414 gold badges9393 silver badges108108 bronze badges ...
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How to configure socket connect timeout

... 147 I found this. Simpler than the accepted answer, and works with .NET v2 Socket socket = new Soc...
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Deleting a resource using http DELETE

... 4 Answers 4 Active ...
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sizeof single struct member in C

... 204 Although defining the buffer size with a #define is one idiomatic way to do it, another would be...
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How do I “commit” changes in a git submodule? [duplicate]

... 430 A submodule is its own repo/work-area, with its own .git directory. So, first commit/push you...
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Fluid width with equally spaced DIVs

... 442 See: http://jsfiddle.net/thirtydot/EDp8R/ This works in IE6+ and all modern browsers! I've ...