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rails 3 validation on uniqueness on multiple attributes
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Multiple Scope Parameters:
class TeacherSchedule < ActiveRecord::Base
validates_uniqueness_of :teacher_id, :scope => [:semester_id, :class_id]
end
http://apidock.com/rails/ActiveRecord/Validations/ClassMethods/validates_uniqueness_of
This should answer Greg's question.
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Accessing nested JavaScript objects and arays by string path
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I just made this based on some similar code I already had, it appears to work:
Object.byString = function(o, s) {
s = s.replace(/\[(\w+)\]/g, '.$1'); // convert indexes to properties
s = s.replace(/^\./, ''); // strip a lea...
You need to use a Theme.AppCompat theme (or descendant) with this activity
... then the Android menifest file will merely refer to them, and select them based on which Android version you are running on your device. Usually it is set to android:theme="@style/AppTheme" and this AppTheme refers to <style name="Theme.AppTheme" parent="Theme.AppCompat.Light"> in styles.xml...
Get TransactionScope to work with async / await
...into our service bus.
I implemented a SingleThreadSynchronizationContext based on this example http://blogs.msdn.com/b/pfxteam/archive/2012/01/20/10259049.aspx .
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Get average color of image via Javascript
...efinitely the best way to do this in the client. SVG is not, SVG is vector based. After I get the execution down, the next thing I want to do is get this running in the canvas (maybe with a webworker for each pixel's overall distance calculation).
Another thing to think about is that RGB is not a g...
How to properly handle a gzipped page when using curl?
...This would appear to be a curl bug, because it should trigger its decoding based on the response, not on what it requested (given that it does support gzip). To quote HTTP 1.1: "If no Accept-Encoding field is present in a request, the server MAY assume that the client will accept any content coding...
What is the 
 character?
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It's the ASCII/UTF code for LF (0A) - Unix-based systems are using it as the newline character, while Windows uses the CR-LF PAIR (OD0A).
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INSERT INTO vs SELECT INTO
... @JNK - From BOL, SELECT INTO creates a table with a structure based on the data types of the columns in the select list. So in your example you could rectify the situation by explicitly casting the varchar to a size that would suffice. Correct?
– jowenece
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Returning redirect as response to XHR request
... fetch() is implemented natively. Polyfill versions of fetch()—which are based on XHR—continue to have XHR's limitations. Fortunately, native browser support seems to be rounding out nicely.
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JavaScript: How to find out if the user browser is Chrome?
...w Opera 18+ also outputs to true for window.chrome. Looks like Opera 18 is based on Chromium 31. So I added a check to make sure the window.navigator.vendor is: "Google Inc" and not is "Opera Software ASA". Also thanks to Ring and Adrien Be for the heads up about Chrome 33 not returning true anymore...