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find() with nil when there are no records
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Yes, just do:
Challenge.find_by_id(10)
For Rails 4 and 5:
Challenge.find_by(id: 10)
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Pandas - How to flatten a hierarchical index in columns
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496
I think the easiest way to do this would be to set the columns to the top level:
df.columns =...
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
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answered Mar 28 '16 at 9:14
Q9703Q9703
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Ruby on Rails: Where to define global constants?
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Holger JustHolger Just
43.4k1414 gold badges9393 silver badges108108 bronze badges
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How to configure socket connect timeout
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147
I found this. Simpler than the accepted answer, and works with .NET v2
Socket socket = new Soc...
sizeof single struct member in C
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204
Although defining the buffer size with a #define is one idiomatic way to do it, another would be...
How do I “commit” changes in a git submodule? [duplicate]
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430
A submodule is its own repo/work-area, with its own .git directory.
So, first commit/push you...
Fluid width with equally spaced DIVs
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442
See: http://jsfiddle.net/thirtydot/EDp8R/
This works in IE6+ and all modern browsers!
I've ...
