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Rails Observer Alternatives for 4.0
...odels you wish to run the after_save in:
class MyModel < ActiveRecord::Base
include MyConcernModule
end
Depending on what you're doing, this might get you close without observers.
share
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Update one MySQL table with values from another
I'm trying to update one MySQL table based on information from another.
2 Answers
2
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Explain the use of a bit vector for determining if all characters are unique
... the right like in decimal numbers only in binaries. We are multiplying by base 2-when we move up however many places not base 10- so the number on the right is the exponent and the number on the left is a base multiple of 2.
This operator |= take the operand on the left and or's it with the oper...
Resize HTML5 canvas to fit window
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Setting the canvas coordinate space width and height based on the browser client's dimensions requires you to resize and redraw whenever the browser is resized.
A less convoluted solution is to maintain the drawable dimensions in Javascript variables, but set the canvas dimen...
Accessing JPEG EXIF rotation data in JavaScript on the client side
I'd like to rotate photos based on their original rotation, as set by the camera in JPEG EXIF image data. The trick is that all this should happen in the browser, using JavaScript and <canvas> .
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Best way to obfuscate an e-mail address on a website?
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A lightweight way to obfuscate the href of an anchor is to base64-encode it:
> btoa('mailto:email@example.com')
< "bWFpbHRvOmVtYWlsQGV4YW1wbGUuY29t"
And then include it hardcoded:
<a href="javascript:window.location.href=atob('bWFpbHRvOmVtYWlsQGV4YW1wbGUuY29t')">E-Mai...
jQuery UI DatePicker to show month year only
...="screen" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/themes/base/jquery-ui.css">
<script type="text/javascript">
$(function() {
$('.date-picker').datepicker( {
changeMonth: true,
changeYear: true,
showButtonPanel: tr...
Difference between constituency parser and dependency parser
...onstituency parser, and then, if needed, it performs a deterministic (rule-based) transformation on the constituency parse tree to convert it into a dependency tree.
More can be found here:
http://en.wikipedia.org/wiki/Phrase_structure_grammar
http://en.wikipedia.org/wiki/Dependency_grammar
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UnicodeDecodeError when redirecting to file
...m). The correct, modern view properly separates these two string concepts, based on the following two points:
Characters are mostly unrelated to computers: one can draw them on a chalk board, etc., like for instance بايثون, 中蟒 and ????. "Characters" for machines also include "drawing ins...
Why are side-effects modeled as monads in Haskell?
...mbedded in it, a monad instance means you can build and flatten new layers based on those values. So whatever meaning you assign to a single layer of the functor, a monad means you can create an unbounded number of layers with a strict notion of causality going from one to the next. Specific instanc...