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tylerhunt / visualize_specs.rb
Last active Feb 12, 2018
Visualize the state of an RSpec suite using the cached example status.
View visualize_specs.rb
require 'rspec/core'
css = %(
html { font-size: 50%; }
.unknown, .passed, .pending, .failed { display: inline-block; height: 1rem; width: 1rem; }
.unknown { background-color: #999; }
.pending { background-color: #FC0; }
.passed { background-color: #3F3; }
.failed { background-color: #F33; }
tylerhunt / Rakefile
Last active Dec 7, 2017
A Rakefile for trying out Citus using Docker
View Rakefile
file 'docker-compose.yml' do
`curl -L > docker-compose.yml`
namespace :citus do
desc 'Start the Citus cluster'
task :up, [:workers] => 'docker-compose.yml' do |_task, args|
tylerhunt / global_id.rb
Created Aug 7, 2015
RSpec shared context to allow testing of Active Job objects with GlobalID-compatible doubles.
View global_id.rb
RSpec.shared_context 'Global ID', :global_id do
def global_id_instance_double(doubled_class, stubs={})
instance_double(doubled_class, stubs)
.tap { |double|
unless double.respond_to?(:id)
allow(double).to receive(:id).and_return(double.object_id)
tylerhunt / rendering_helper.rb
Created Mar 20, 2015
Override Rails' #render helper to fix an issue with rendering partials based on an object within a namespace.
View rendering_helper.rb
module RenderingHelper
# Override Rails' #render helper to fix an issue with it not honoring objects
# with #to_partial_path definitions that return absolute paths, which is
# problematic when rendering partials within a namespaced controller.
def render(options={}, locals={}, &block)
return super unless options.respond_to?(:to_partial_path)
object = options
path = object.to_partial_path
tylerhunt / active_record_decorator.rb
Created Mar 19, 2015
An abstract decorator that allows decorated Active Record records to be assigned to associations without raising an ActiveRecord::AssociationTypeMismatch error.
View active_record_decorator.rb
require 'delegate'
# An abstract decorator useful for decorating Active Record objects.
class ActiveRecordDecorator < SimpleDelegator
# A proxy for the decorator class to allow the delegation of certain class
# methods to the decorated object's class.
class ClassProxy < SimpleDelegator
def initialize(decorator_class, decorated_class)
super decorator_class
self.decorated_class = decorated_class
tylerhunt / dependencies.rb
Created Feb 28, 2015
A macro to allow object dependencies to be specified at the class level with a block defining a default value. Based on attr_defaultable.
View dependencies.rb
module Dependencies
# Ensure dependencies from the superclass are inherited by the subclass.
def inherited(subclass)
if superclass.respond_to?(:dependencies)
subclass.dependencies.concat dependencies
tylerhunt / my_rack_app.rb
Created Sep 29, 2014
Rack app object with middleware
View my_rack_app.rb
class MyRackApp
def initialize(app)
stack = Rack::Buidler
# stack.use … app
@app = stack.to_app
def call(env)
tylerhunt /
Created Sep 10, 2014
Static error pages from dynamically generated assets.

The guide Asset Pipeline Error Pages now no longer works, since non-digest assets aren't generated in newer Rails apps. To fix this, I've replaced the config/initializers/exceptions.rb initializer that swaps out the middleware with the Rake task here, which will be run after Rails assets:precompile task.

tylerhunt / void.rb
Created Aug 15, 2014
Void macro for Ruby
View void.rb
module Void
def void(method_name)
method = instance_method(method_name)
remove_method method_name
define_method(method_name) do |*args, &block|
method.bind(self).call(*args, &block).tap do |return_value|
raise TypeError, 'unexpected return value' unless return_value.nil?
tylerhunt / validations.rb
Last active Aug 29, 2015
Using ActiveModel::Validations standalone.
View validations.rb
# What I should have to do:
require 'active_model/validations'
# What I actually have to do:
require 'active_support/callbacks'
require 'active_support/concern'
require 'active_support/core_ext/module/delegation'
require 'active_model/callbacks'
require 'active_model/errors'
require 'active_model/naming'
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