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rails 3 validation on uniqueness on multiple attributes
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Jason Swett
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answered Jul 18 '10 at 15:55
Christian LescuyerChristian Lesc...
Passing multiple error classes to ruby's rescue clause in a DRY fashion
...ds to vacuity:
[a, *[], b] # => [a, b]
One difference between ruby 1.8 and ruby 1.9 is with nil.
[a, *nil, b] # => [a, b] (ruby 1.9)
[a, *nil, b] # => [a, nil, b] (ruby 1.8)
Be careful with objects on which to_a is defined, as to_a will be applied in such cases:
[a, *{k: :v}, ...
Check if array is empty or null
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answered Aug 25 '11 at 23:48
jfriend00jfriend00
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Add a number to each selection in Sublime Text 2, incremented once per selection
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PJSCopeland
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answered Feb 3 '13 at 8:15
aantonaanton
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Create array of symbols
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edited Oct 10 '19 at 18:45
Dmitri
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answered Ju...
Create a tar.xz in one command
...r to man tar :)
tar cfJ <archive.tar.xz> <files>
Edit 2015-08-10:
If you're passing the arguments to tar with dashes (ex: tar -cf as opposed to tar cf), then the -f option must come last, since it specifies the filename (thanks to @A-B-B for pointing that out!). In that case, the com...
How does OpenID authentication work?
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What is OpenID?
OpenID is an open, decentralized, free framework for user-centric digital ident...
Accessing JPEG EXIF rotation data in JavaScript on the client side
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8 Answers
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Can I use __init__.py to define global variables?
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edited Apr 5 '17 at 14:18
Willem Van Onsem
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Checking if a key exists in a JavaScript object?
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edited Oct 10 '19 at 18:56
answered Jul 8 '09 at 15:51
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