Vincent Waller vwall

Sublime Text 2 – Useful Shortcuts (Mac OS X)

General

⌘T	go to file
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⌘R	go to methods
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Presenters in Rails

I have bemoaned the lack of a ViewModel in Rails many times, and I prefer using Presenters to simulate a ViewModel. But it turns out there is an object that does represent the state of the view in Rails apps. Its an instance of ActionView::Base that the controller calls view_context. We don't have much control of this object, but it seems like a logical place to put our view-specific behavior.

This code is an attempt at creating Presenters using modules. The module will be mixed into the view_context object. This is very similar to how a Decorator module will be mixed into a model object, only instead of being specific to the model is it specific to the view.

This means that testing your presenter is no different than testing any other module. So relying on dependencies such as other methods or instance variables can make testing difficult.

agnoster.zsh-theme

A ZSH theme optimized for people who use:

Solarized
Git
Unicode-compatible fonts and terminals (I use iTerm2 + Menlo)

For Mac users, I highly recommend iTerm 2 + Solarized Dark

I'm a fan of MiniTest::Spec. It strikes a nice balance between the simplicity of TestUnit and the readable syntax of RSpec. When I first switched from RSpec to MiniTest::Spec, one thing I was worried I would miss was the ability to add matchers. (A note in terminology: "matchers" in MiniTest::Spec refer to something completely different than "matchers" in RSpec. I won't get into it, but from now on, let's use the proper term: "expectations").

Understanding MiniTest::Expectations

Let's take a look in the code (I'm specifically referring to the gem, not the standard library that's built into Ruby 1.9):

# minitest/spec.rb

module MiniTest::Expectations

	require 'strong_parameters'

	class ActiveRecord::Base
	include ActiveModel::ForbiddenAttributesProtection
	end

	class ActionController::Base

	# Use this with CanCan's load_resource to permit a set of params before
	# it tries to build or update a resource with them.

	require 'sinatra'
	require 'redis'
	require 'json'
	require 'date'

	class String

	def &(str)
	result = ''
	result.force_encoding("BINARY")

	=Navigating=
	visit('/projects')
	visit(post_comments_path(post))

	=Clicking links and buttons=
	click_link('id-of-link')
	click_link('Link Text')
	click_button('Save')
	click('Link Text') # Click either a link or a button
	click('Button Value')

	Handlebars.registerHelper('equal', function(lvalue, rvalue, options) {
	if (arguments.length < 3)
	throw new Error("Handlebars Helper equal needs 2 parameters");
	if( lvalue!=rvalue ) {
	return options.inverse(this);
	} else {
	return options.fn(this);
	}
	});

	/** Reinflates a compressed signature string:
	resolution = a representation of the resolution in
	pixels of the canvas which this signature will be drawn
	e.g. {x:800,y:200}
	*/
	var inflateToJsonSignature = function (deflatedSig, resolution) {
	var components = [],
	modifier = 1,
	compressWithResolution = /^(?:\[(\d+)x(\d+)\])?([\w\W]*)/,
	parsedSigString = deflatedSig.match(compressWithResolution),