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ActionController::InvalidAuthenticityToken

...h were page cached. Pages got buffered with a stale authenticity token and all actions using the methods post/put/delete where recognized as forgery attempts. Error (422 Unprocessable Entity) was returned to the user. The solution for Rails 3: Add: skip_before_filter :verify_authenticity_token ...
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What are unit tests, integration tests, smoke tests, and regression tests?

...re we just check that when the system under test is invoked it returns normally and does not blow up. Smoke testing is both an analogy with electronics, where the first test occurs when powering up a circuit (if it smokes, it's bad!)... ... and, apparently, with plumbing, where a system of pipes i...
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How to get notified about changes of the history via history.pushState?

...); } // ... whatever else you want to do // maybe call onhashchange e.handler return pushState.apply(history, arguments); }; })(window.history); Your jsfiddle becomes: window.onpopstate = history.onpushstate = function(e) { ... } You can monkey-patch window.h...
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Hidden Features of C#? [closed]

... This isn't C# per se, but I haven't seen anyone who really uses System.IO.Path.Combine() to the extent that they should. In fact, the whole Path class is really useful, but no one uses it! I'm willing to bet that every production app has the following code, even though it shoul...
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Database sharding vs partitioning

...databases. Sharding is one specific type of partitioning, part of what is called horizontal partitioning. Here you replicate the schema across (typically) multiple instances or servers, using some kind of logic or identifier to know which instance or server to look for the data. An identifier of th...
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Cropping an UIImage

...of the center of the image - I use this to take a UIImage and return a small, square representation of an image, similar to what's seen in the album view of the Photos app. (I know I could use a UIImageView and adjust the crop mode to achieve the same results, but these images are sometimes disp...
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Installing R with Homebrew

I'm trying to install R using Homebrew. I ran these commands which are recommended elsewhere on SO: 12 Answers ...
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javascript: pause setTimeout();

...imilar to what you were suggesting in the question: var Timer = function(callback, delay) { var timerId, start, remaining = delay; this.pause = function() { window.clearTimeout(timerId); remaining -= Date.now() - start; }; this.resume = function() { start =...
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How to check if a variable is a dictionary in Python?

...t, defaultdict, or Counter from the collections module: if isinstance(any_object, dict): But there are even more flexible options. Supporting abstractions: from collections.abc import Mapping if isinstance(any_object, Mapping): This allows the user of your code to use their own custom implem...
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Change the Target Framework for all my projects in a Visual Studio Solution

I need to change the target framework for all projects. I have many solutions with hundreds of projects. 10 Answers ...