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How to drop columns using Rails migration
...:table_name, :column_name, :type, :options within the change method, since if you specify the type reverting the migration is possible. From the documentation: The typeand options parameters will be ignored if present. It can be helpful to provide these in a migration's change method so it can be re...
Breadth First Vs Depth First
When Traversing a Tree/Graph what is the difference between Breadth First and Depth first? Any coding or pseudocode examples would be great.
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How do you get the logical xor of two variables in Python?
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If you're already normalizing the inputs to booleans, then != is xor.
bool(a) != bool(b)
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Java RegEx meta character (.) and ordinary dot?
In Java RegEx, how to find out the difference between . (dot) the meta character and the normal dot as we using in any sentence. How to handle this kind of situation for other meta characters too like ( * , + , \d ,...)
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PHP: How to remove all non printable characters in a string?
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7 bit ASCII?
If your Tardis just landed in 1963, and you just want the 7 bit printable ASCII chars, you can rip out everything from 0-31 and 127-255 with this:
$string = preg_replace('/[\x00-\x1F\x7F-\xFF]/', '', $string);
It matches a...
How can I autoformat/indent C code in vim?
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What is the difference?
– Ton van den Heuvel
Mar 1 '10 at 13:35
3
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How can I multiply all items in a list together with Python?
...ordsforthewise without the third argument, it throws a TypeError exception if you pass it an empty sequence
– Francisco Couzo
Jul 11 '16 at 3:41
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C# short/long/int literal format?
...g
var l = 1L; // long
I think that's all... there are no literal specifiers for short/ushort/byte/sbyte
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How can I calculate an md5 checksum of a directory?
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Note that the same checksum will be generated if a file gets renamed. So this doesn't truly fit a "checksum which will uniquely identify the directory as a whole" if you consider file layout part of the signature.
– Valentin Milea
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Error message 'Unable to load one or more of the requested types. Retrieve the LoaderExceptions prop
...well, that's fine when you are debugging from Visual Studio. But how about if you're web application only throw this error on the production server? even after you set the Copy Local attribute to true.
– Yousi
Oct 16 '14 at 4:47
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