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Run a callback only if an attribute has changed in Rails
... on the return value of a method call. The status_id_changed? method comes from ActiveModel::Dirty, which allows us to check if a specific attribute has changed by simply appending _changed? to the attribute name.
When the do_something method should be called is up to your needs. It could be before...
Simplest/Cleanest way to implement singleton in JavaScript?
...n you can simply import the singleton object to use it:
import myInstance from './my-singleton.js'
// ...
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Private vs Public in Cache-Control
...g proxies to cache... I'm guessing this was a typo. +1 on the answer apart from that. It's worth adding that private does not offer any degree of security, it can still be seen by agents in the middle. It just means that no "honest" agent will give it to someone else instead of a freshly generated ...
How to apply an XSLT Stylesheet in C#
...123237/http://www.csharpfriends.com/Articles/getArticle.aspx?articleID=63
From the article:
XPathDocument myXPathDoc = new XPathDocument(myXmlFile) ;
XslTransform myXslTrans = new XslTransform() ;
myXslTrans.Load(myStyleSheet);
XmlTextWriter myWriter = new XmlTextWriter("result.html",null) ;
myXsl...
Convert object to JSON in Android
... Why we have no embedded method for toJson? But we have for fromJson ?
– M at
Nov 22 '17 at 10:31
try t...
Or versus OrElse
... is probably what most expect even when using "Or" (especially when coming from other languages).
– Kjartan
Aug 13 '12 at 13:33
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Using Moq to mock an asynchronous method for a unit test
...leting. However, don't just start the task - instead, change to using Task.FromResult<TResult> which will give you a task which has already completed:
...
.Returns(Task.FromResult(new HttpResponseMessage(System.Net.HttpStatusCode.OK)));
Note that you won't be testing the actual asynchrony t...
How do I check if an integer is even or odd? [closed]
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It's getting lots of upvotes to distinguish it from the bitwise operator morons, without having to spend our karma voting them down.
– wnoise
Oct 2 '08 at 22:21
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How to get the PATH environment-variable separator in Python?
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You are right, thanks! My confusion came from that fact that actually I was looking for the '\' and '/' system-specific separator (which is os.path.sep) whereas this page was proposed as one of the search results.
– DVV
Mar 7 '...
How can I be notified when an element is added to the page?
... Careful. If millisecond precision is important, this approach is far from accurate. This jsbin demonstrates that there is more than 30ms difference between an inline callback and using animationstart, jsbin.com/netuquralu/1/edit.
– Gajus
Dec 5 '16 at 15:4...