jrochkind

# Adapted from slide 5 at http://www.slideshare.net/igrigorik/no-callbacks-no-threads-railsconf-2010

require 'rubygems'
require 'active_record'
require 'mysql'

gem 'mysql2', "< 0.3.0" # for rails 3.0
#gem 'mysql2', ">= 0.3.0" # for rails 3.1

ActiveRecord::Base.establish_connection(

jrochkind

# Call ActiveRecord::base.forbid_implicit_checkout_for_thread! from a thread, and if
# that thread later tries to access an active record connection without explicit checkout
# (#with_connection, or #checkout), an ImplicitConnectionForbiddenError will be raised. 

module ActiveRecord
  class Base
    class << self
      def forbid_implicit_checkout_for_thread!
        Thread.current[:active_record_forbid_implicit_connections] = true
      end

jrochkind

#!/usr/bin/env ruby

require 'rubygems'
require 'nokogiri'
require 'hpricot'

puts "\n\n"

$global_binding = binding()
$global_stmt_count = 0

jrochkind

Generate into application.css:

============

/*= require blacklight */

=============

DO generate a blacklight.scss into the local app, it looks just like this though:

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test code

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ActionView::Template::Error (Invalid CSS after "elements-of-type": expected selector, was "(html5-block)"
  (in /home/rochkind/bl-rails31/blacklight/app/assets/stylesheets/blacklight/blacklight.css.scss)):
    4:     <title><%= h(@page_title || application_name) %></title>
    5:     <link href="<%= opensearch_catalog_path(:format => 'xml', :only_path => false) %>" title="<%= application_name%>" type="application/opensearchdescription+xml" rel="search"/>
    6:     <%= favicon_link_tag asset_path('favicon.ico') %>
    7:     <%= stylesheet_link_tag    "application" %>
    8:     <%= javascript_include_tag "application" %>
    9:     <%= csrf_meta_tags %>
    10:     <%= raw(render_head_content) %>

jrochkind

[rochkind@xs001 ~]$ rvm reinstall 1.9.3-p0 --patch debug --force-autoconf
Removing /home/rochkind/.rvm/src/ruby-1.9.3-p0...
it seems that /home/rochkind/.rvm/rubies/ruby-1.9.3-p0 is already non existent.
Removing ruby-1.9.3-p0 aliases...
Removing ruby-1.9.3-p0 wrappers...
Removing ruby-1.9.3-p0 environments...
Removing ruby-1.9.3-p0 binaries...
Installing Ruby from source to: /home/rochkind/.rvm/rubies/ruby-1.9.3-p0, this may take a while depending on your cpu(s)...

ruby-1.9.3-p0 - #fetching

jrochkind

An exploration of "dependency injection" in ruby

I recently came across this reddit, demo'ing "dependency injection and inversion of control" in what I think is C#/.Net?

It resulted in a predictable spate of comments on reddit saying basicaly "oh my gosh, dependency injection is so evil, just look at that."

But it got me thinking about how I'd handle the same issues in ruby, and I think the issues to be handled are real issues. So let's look at that.

I don't understand the (.Net?) framework being used in the original example, and I don't feel like reproducing an app environment that would do similar in ruby, so let's just stick to the heart of the matter. They've got some class (not entirely sure which one it is in their tree) that has a method that processes payments, translating that method into ruby it looks something like this:

jrochkind

# ./config/initializers/asset_precompile_prefix_fix.rb
#
# So we can deploy at a SubURI, and precompile assets to respect that with:
#    RAILS_RELATIVE_URL_ROOT=/foo rake assets:precompile
#
# See: http://stackoverflow.com/questions/7293918/broken-precompiled-assets-in-rails-3-1-when-deploying-to-a-sub-uri
#
# Confirmed working in Rails 3.1.3
# Future versions of Rails may make this monkey patch unneccesary. (or break
# it without making it unneccesary)

jrochkind

module MyAccessors
  def my_attr_accessor(property_name)
       send(:define_method, property_name) do
         instance_variable_get("@#{property_name}")
       end

       send(:define_method, "#{property_name}=") do |value|
         instance_variable_set("@#{property_name}", value)
       end
  end