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How can I rename a database column in a Ruby on Rails migration?
...st db:migrate as usual or however you go about your business.
For Rails 4:
While creating a Migration for renaming a column, Rails 4 generates a change method instead of up and down as mentioned in the above section. The generated change method is:
$ > rails g migration ChangeColumnName
w...
What exactly are iterator, iterable, and iteration?
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edited Aug 8 '14 at 15:53
Bryan
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answer...
Get a list of all threads currently running in Java
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edited Oct 17 '18 at 6:44
Darwin
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answered Jun...
CSS: Setting width/height as Percentage minus pixels
... Levi BotelhoLevi Botelho
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How to round an average to 2 decimal places in PostgreSQL?
...sion is only available for numeric.
regress=> SELECT round( float8 '3.1415927', 2 );
ERROR: function round(double precision, integer) does not exist
regress=> \df *round*
List of functions
Schema | Name | Result data type | Argument data types | Type
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Where does PHP's error log reside in XAMPP?
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LekensteynLekensteyn
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How to get a string after a specific substring?
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419
The easiest way is probably just to split on your target word
my_string="hello python world ,...
How can I get seconds since epoch in Javascript?
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249
var seconds = new Date() / 1000;
Or, for a less hacky version:
var d = new Date();
var secon...
psql: could not connect to server: No such file or directory (Mac OS X)
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431
WARNING: If you delete postmaster.pid without making sure there are really no postgres process...
What's the difference between “static” and “static inline” function?
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edited Oct 14 '11 at 4:03
answered Oct 14 '11 at 3:27
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