Fitzsimmons

var that = this;
this.player.on("audio-ended", function() {
  that.next();
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//-------VERSUS-----------

this.player.on("audio-ended", function() {
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Fitzsimmons

Building Rich Domain Models in Rails

Part 1. Decoupling Persistence

Abstract

Domain model is an effective tool for software development. It can be used to express really complex business logic, and to verify and validate the understanding of the domain among stakeholders. Building rich domain models in Rails is hard. Primarily, because of Active Record, which doesn't play well with the domain model approach.

One way to deal with this problem is to use an ORM implementing the data mapper pattern. Unfortunately, there is no production ready ORM doing that for Ruby. DataMapper 2 is going to be the first one.

Another way is to use Active Record just as a persistence mechanism and build a rich domain model on top of it. That's what I'm going to talk about here.

Fitzsimmons

results = arel.
  select("COUNT(#{table_name}.id) OVER () AS non_paged_count, #{table_name}.*").
  offset(offset).
  limit(per_page).all

Fitzsimmons

class Pager
  attr_reader :arel, :page, :per_page

  def initialize(arel, options={})
    @arel = arel
    @page = Integer(options[:page]) rescue 1
    @per_page = Integer(options[:per_page]) rescue arel.klass.default_per_page
  end

  def paged_results

Fitzsimmons

     non_paged_count |   id    [extra columns omitted]
    -----------------+--------
                 130 | 239184
                 130 | 239183
    [98 additional records omitted]

Fitzsimmons

def index
  arel = DocumentFilter.find(params)
  @documents = Pager.new(arel, :page => params[:page]).paged_results
end

Fitzsimmons

require 'pg'
require 'mongo'
require 'nokogiri'

mongo_conn = Mongo::Connection.new.db("qcloud_dev")
pg_conn = PG.connect(:dbname => "poc")

standards_collection = mongo_conn["standards"]
sheets_collection = mongo_conn["sheets"]

Fitzsimmons

WITH unified_materials AS(
-- Find the base materials (used to calculate the 'base price' for an item?)
SELECT typename, quantity FROM invtypematerials AS mats
INNER JOIN invtypes ON invtypes.typeid = mats.materialtypeid
WHERE mats.typeid = 11993

UNION

-- Find the complex materials (Never present in T1 stuff)
SELECT invtypes.typename,

Fitzsimmons

Sometimes it works...

Digest:   [18 8c ab df 4a 78 3a 31 2e 9a 57 94 a8 b 76 42 6c 12 3d 83]
Offset:   3
Excerpt:  [df 4a 78 3a]
Unsigned: [5f 4a 78 3a]
Squashed: 5f4a783a

------------------

Fitzsimmons

irb(main):001:0> A = [1,2,3]
=> [1, 2, 3]
irb(main):002:0> def test_next
irb(main):003:1>   puts A.map{|x| next x}.inspect
irb(main):004:1>   puts "Finished nexting!"
irb(main):005:1> end
=> nil
irb(main):006:0> test_next
[1, 2, 3]
Finished nexting!