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Python function attributes - uses and abuses [closed]
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154
I typically use function attributes as storage for annotations. Suppose I want to write, in th...
How to Set Focus on Input Field using JQuery
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138
Try this, to set the focus to the first input field:
$(this).parent().siblings('div.bottom')....
String replacement in java, similar to a velocity template
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143
Use StringSubstitutor from Apache Commons Text.
https://commons.apache.org/proper/commons-tex...
What is Hindley-Milner?
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168
Hindley-Milner is a type system discovered independently by Roger Hindley (who was looking at ...
Why C# fails to compare two object types with each other but VB doesn't?
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168
In C#, the == operator (when applied to reference type expressions) performs a reference equal...
How to check an Android device is HDPI screen or MDPI screen?
...rces().getDisplayMetrics().density;
// return 0.75 if it's LDPI
// return 1.0 if it's MDPI
// return 1.5 if it's HDPI
// return 2.0 if it's XHDPI
// return 3.0 if it's XXHDPI
// return 4.0 if it's XXXHDPI
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Postgresql aggregate array
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163
Use array_agg: http://www.sqlfiddle.com/#!1/5099e/1
SELECT s.name, array_agg(g.Mark) as mark...
PHP filesize MB/KB conversion [duplicate]
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12 Answers
12
Active
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How to add 10 days to current time in Rails
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Use
Time.now + 10.days
or even
10.days.from_now
Both definitely work. Are you sure you're in Rails and not just Ruby?
If you definitely are in Rails, where are you trying to run this from? Note that Active Support has to be loaded.
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