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Find the extension of a filename in Ruby

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How to sort the result from string_agg()

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What is the difference between t.belongs_to and t.references in rails?

What is the difference between t.references and t.belongs_to ? Why are we having those two different words? It seems to me they do the same thing? Tried some Google search, but find no explanation. ...
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Specify pane percentage in tmuxinator project

How can I specify a pane percentage in tmuxinator ? 1 Answer 1 ...
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Rails: where does the infamous “current_user” come from?

I've been looking around recently into Rails and notice that there are a lot of references to current_user . Does this only come from Devise? and do I have to manually define it myself even if I use Devise? Are there prerequisites to using current_user (like the existence of sessions, users, etc)...
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NULL vs nil in Objective-C

In observeValueForKeyPath:ofObject:change:context: - why do the docs use NULL instead of nil when not specifying a context pointer? ...
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JSTL in JSF2 Facelets… makes sense?

I would like to output a bit of Facelets code conditionally. 3 Answers 3 ...
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Uninstall ReSharper 4.5

...harper 4.5 in Visual Studio 2008. Now I want to install ReSharper 5, but I can't do it before I uninstall ReSharper 4.5. 4 ...
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Scala downwards or decreasing for loop?

In Scala, you often use an iterator to do a for loop in an increasing order like: 7 Answers ...
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Setting focus on an HTML input box on page load

I'm trying to set the default focus on an input box when the page loads (example: google). My page is very simple, yet I can't figure out how to do this. ...