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delete_all vs destroy_all?
... / destroy_all: The associated objects are destroyed alongside this object by calling their destroy method
delete / delete_all: All associated objects are destroyed immediately without calling their :destroy method
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How to redirect stderr to null in cmd.exe
...ing command redirection operators. Besides the "2>" construct mentioned by Tanuki Software, it lists some other useful combinations.
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mysql create user if not exists
...o use CREATE USER
CREATE USER IF NOT EXISTS 'user'@'localhost' IDENTIFIED BY 'password';
Note that the 5.7.6 method doesn't actually grant any permissions.
If you aren't using a version which has this capability (something below 5.7.6), you can do the following:
GRANT ALL ON `database`.* TO '...
How can I test that a value is “greater than or equal to” in Jasmine?
....toBeLessThan(0);
In this approach, the value of percent can be returned by an async function and processed as a part of the control flow.
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Is there a way to view past mysql queries with phpmyadmin?
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There is a Console tab at the bottom of the SQL (query) screen. By default it is not expanded, but once clicked on it should expose tabs for Options, History and Clear. Click on history.
The Query history length is set from within Page Related Settings which found by clicking on the gea...
What is the significance of initializing direction arrays below with given values when developing ch
...ion x,y, and we want to add onto its x and its y value to move it to a nearby location, 1,0 is east, -1,0 is west, 0,1 is south, 0,-1 is north and so on.
(Here I have said top left is 0,0 and bottom right is 4,4 and shown what move each index of the arrays will make from the central point, X, at 2,...
Difference between a class and a module
I came from Java, and now I am working more with Ruby.
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In Ruby on Rails, how do I format a date with the “th” suffix, as in, “Sun Oct 5th”?
....day.ordinalize}")
=> "Fri Oct 3rd"
Note, if you are using IRB with Ruby 2.0, you must first run:
require 'active_support/core_ext/integer/inflections'
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Get the short Git version hash
...can do the reverse and get the long commit hash from the short commit hash by doing the following git rev-parse HEAD
– Andrew
Jan 12 '15 at 17:21
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Capturing multiple line output into a Bash variable
...eates a potentially very long single line of output with 'words' separated by single spaces (where a 'word' is a sequence of non-whitespace characters; there needn't be any alphanumerics in any of the words).
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