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How to swap keys and values in a hash
...f the hash are already arrays, you can do:
> hash={ "A" => [14, 15, 16], "B" => [17, 15], "C" => [35, 15] }
> hash.each_with_object(Hash.new { |h,k| h[k]=[] }) {|(k,v), h|
v.map {|t| h[t] << k}
}
=> {14=>["A"], 15=>["A", "B", "C"], 16=>["...
Unique BooleanField value in Django?
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answered Sep 21 '09 at 16:41
AdamAdam
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Reset the database (purge all), then seed a database
...es to update.
– etusm
Dec 13 '14 at 16:48
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Add unique constraint to combination of two columns
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answered Aug 18 '16 at 15:21
Tony L.Tony L.
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error: ‘NULL’ was not declared in this scope
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answered Nov 30 '11 at 14:16
Seppo EnarviSeppo Enarvi
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Can I hex edit a file in Visual Studio?
... default ?).
– tigrou
Jun 19 '12 at 16:45
5
From msdn.microsoft.com/en-us/library/cb4x6esf.aspx ...
How to change current Theme at runtime in Android [duplicate]
...to another...
– Guido
Mar 20 '10 at 16:06
19
Please provide a self-contained answer so that if th...
Border in shape xml
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answered Apr 16 '15 at 13:21
Miguel RodríguezMiguel Rodríguez
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gulp command not found - error after installing gulp
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answered Feb 7 '16 at 21:23
csnatecsnate
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Convert blob URL to normal URL
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164
A URL that was created from a JavaScript Blob can not be converted to a "normal" URL.
A blob:...