Raising and Rescuing Custom Errors in Rails

Following on from our post on Dynamic Error Page in Rails, this week we’re going to look at raising and rescuing custom errors in a Rails application.

It’s often useful to map custom Ruby errors to HTTP response status codes and have Rails render the appropriate HTML error pages. For example, you might have a controller that is acting as a simple proxy to a third party

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service such as Twitter or Facebook, and you need050-SEPROAUTH-02 any of the HTTP errors encountered when calling those sites to be handled natively by your app. Another use case would be in a Service-oriented architecture (SOA), where you want any errors in your back end services propagated to your front end web application.

In this post we’ll demonstrate rescuing status errors in an imaginary proxy controller using the awesome Faraday gem. For the sake of brevity we’ve omitted the inclusion ofSK0-003 tests though in the wild we’d build such a feature using TDD and our favourite test weapon, RSpec. – Raising and Rescuing Custom Errors in Rails by Josh Nesbitt