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rails 3 validation on uniqueness on multiple attributes
I use Rails 3.0.0.beta4
3 Answers
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How to atomically delete keys matching a pattern using Redis
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Starting with redis 2.6.0, you can run lua scripts, which execute atomically. I have never written one, but I think it would look something like this
EVAL "return redis.call('del', unpack(redis.call('keys', ARGV[1])))" 0 prefix:[YOUR_PREFIX e.g del...
Calculating how many minutes there are between two times
... you trying 'span.Minutes', this will return only the minutes of timespan [0~59], to return sum of all minutes from this interval, just use 'span.TotalMinutes'.
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Get TransactionScope to work with async / await
...onContext based on this example http://blogs.msdn.com/b/pfxteam/archive/2012/01/20/10259049.aspx .
3 Answers
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How can I divide two integers to get a double?
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answered Mar 19 '09 at 4:14
NoahDNoahD
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How add “or” in switch statements?
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edited May 11 '09 at 14:56
answered May 11 '09 at 14:51
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Java `final` method: what does it promise?
...ss is a good example.
public class Counter {
private int counter = 0;
public final int count() {
return counter++;
}
public final int reset() {
return (counter = 0);
}
}
If the public final int count() method is not final, we can do something like this:
C...
How do I find numeric columns in Pandas?
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150
You could use select_dtypes method of DataFrame. It includes two parameters include and exclude....
How to “re-run with -deprecation for details” in sbt?
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edited Mar 13 '19 at 10:16
Jacek Laskowski
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Where to put view-specific javascript files in an ASP.NET MVC application?
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answered Jun 23 '11 at 12:07
daveswdavesw
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