Result Objects - Errors Without Exceptions
def register_new_user(params) new_user = User.new(params) authorize! :create, new_user new_user.save! send_welcome_email(new_user) end Even after reading the implementation, it’s still difficult to know for sure. Some of the possible exceptions would be obvious to a Rails developer, and you can probably guess which methods could throw other exceptions, but exceptions could be raised by any method
How To Make A DSL, Hygienically
template = RXT::Template.from_file('weather.rxt') puts template.render( time: Time.now, description: 'Bright & sunny.', temp: 18.3, wind_vel: 14, wind_direction: 'SSE', ) I’ve given this Ruby XML templating language a spicy, exotic name: Ruby XML Template (RXT). I know, XML doesn’t make for the most exciting DSL, and the usefulness of this particular DSL is questionable. But it will do nicely for
RSpec Expectations Cheat Sheet
Continuing the from the previous post, here is a cheat sheet for RSpec’s assertion library: RSpec::Expectations. RSpec is a mature, feature-packed testing framework, but the documentation can be difficult to navigate. As an alternative to the official documentation, this cheat sheet contains short example code to demonstrate all the built-in expectation matchers. These examples were created with R
Examining The Internals Of The Rails Request/Response Cycle
Come with me on a journey through the internals of Rails, as we trace a request from the web server to the controller action method, and follow the response back again. This will give you a glimpse of how Rails works under the hood, hopefully exposing some of the “magic” of the framework. We will also get to see some of the design/architectural decisions at the core of Rails. This analysis was con
The Pure Function As An Object (PFAAO) Pattern
In Ruby, all functions are methods, so the terms “function” and “method” are interchangeable in this article. In this article, I want to demonstrate a nice way to write functional-style code in Ruby. It is a way to write non-trivial pure functions, without a bunch of weird non-idiomatic code. I’ll start by defining what pure functions are, explaining their benefits, and then walk through an exampl
RSpec::Core Cheat Sheet
RSpec is a mature, feature-packed testing framework, but the documentation can be difficult to navigate. The official documentation is written as a set of Cucumber tests within Relish. It’s very comprehensive, but also quite sparse, and Cucumber tests are kind of unnatural to read. When I forget how to do something in RSpec, I usually just look for an example in a test I’ve written previously, so
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