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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.

vwall

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.

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Sublime Text 2 – Useful Shortcuts (Mac OS X)

General

⌘T	go to file
⌘⌃P	go to project
⌘R	go to methods
⌃G	go to line
⌘KB	toggle side bar
⌘⇧P	command prompt

vwall

# include from an initializer

module HstoreAccessor
  def self.included(base)
    base.extend(ClassMethods)
  end
  
  module ClassMethods
    def hstore_accessor(hstore_attribute, *keys)
      Array(keys).flatten.each do |key|

vwall

Install Postgresql on Mountain Lion

Based on: http://coderwall.com/p/1mni7w

brew install postgresql
initdb /usr/local/var/postgres -E utf8
mkdir -p ~/Library/LaunchAgents
cp /usr/local/Cellar/postgresql/9.1.4/homebrew.mxcl.postgresql.plist ~/Library/LaunchAgents/
launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

vwall

// Media Queries in Sass 3.2
//
// These mixins make media queries a breeze with Sass.
// The media queries from mobile up until desktop all 
// trigger at different points along the way
//
// And important point to remember is that and width
// over the portrait width is considered to be part of the
// landscape width. This allows us to capture widths of devices
// that might not fit the dimensions exactly. This means the break

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class ActionDispatch::Routing::Mapper
  def draw(routes_name)
    instance_eval(File.read(Rails.root.join("config/routes", "#{@scope[:shallow_prefix]}", "#{routes_name}.rb")))
  end
end

BCX::Application.routes.draw do  
  draw :projects # => config/routes/projects.rb

  namespace :admin do

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class ActionDispatch::Routing::Mapper
  def draw(routes_name)
    instance_eval(File.read(Rails.root.join("config/routes/#{routes_name}.rb")))
  end
end

BCX::Application.routes.draw do
  draw :api
  draw :account
  draw :session

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#
# A basic, synthetic benchmark of the impact HTTP client has
# on the speed of talking to ElasticSearch in the Tire gem.
#
# In general, Curb seems to be more then two times faster the RestClient, in some cases it's three
# to five times faster. I wonder if keep-alive has anything to do with it, but it probably does.
#
# Run me with:
#     $ git clone git://github.com/karmi/tire.git
#     $ cd tire

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# Put this at the bottom of your config/deploy.rb
# Requires config file ~/.campfire.yml with your API token from
# your Campfire "My Info" page:
#
# token: lkjsadfsaduoi1u31oui3eh1kj2h
# roomid: 123456
# subdomain: acmeco

class Room
  attr_accessor :config