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Index on multiple columns in Ruby on Rails
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2 Answers
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How exactly does the “Specific Version” property of an assembly reference work in Visual Studio?
...at the "Specific Version" property of assembly references in Visual Studio 2010. After a few experiments with unexpected results I set out to learn as much as possible about how the property works. Even SO, it appears to me, does not have all the answers, so here is my attempt at self-answering the ...
How to convert a NumPy array to PIL image applying matplotlib colormap
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235
Quite a busy one-liner, but here it is:
First ensure your NumPy array, myarray, is normalise...
How to do date/time comparison
...mp; check.Before(end)
}
func main() {
start, _ := time.Parse(time.RFC822, "01 Jan 15 10:00 UTC")
end, _ := time.Parse(time.RFC822, "01 Jan 16 10:00 UTC")
in, _ := time.Parse(time.RFC822, "01 Jan 15 20:00 UTC")
out, _ := time.Parse(time.RFC822, "01 Jan 17 10:00 UTC")
if inTimeS...
Format in kotlin string templates
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256
Unfortunately, there's no built-in support for formatting in string templates yet, as a workar...
New Line on PHP CLI
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248
Use double quotes ".
echo "next line\n";
Additional you can use the system-dependent consta...
When to use Preorder, Postorder, and Inorder Binary Search Tree Traversal strategies
...oot (7), ends at the right-most node (10)
Traversal sequence: 7, 1, 0, 3, 2, 5, 4, 6, 9, 8, 10
In-order traversal:
Summary: Begins at the left-most node (0), ends at the rightmost node (10)
Traversal Sequence: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Post-order traversal:
Summary: Begins with the le...
validation custom message for rails 3
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edited Mar 4 '15 at 3:20
Andrew Hendrie
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answ...
How to copy a row and insert in same table with a autoincrement field in MySQL?
...n ID=1 and insert the data into same table as a new row with column ID=2 .
13 Answers
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