zacclark

select
      count(case when photos.created_at < trips.start_date then distinct(photos.id) end) as before,
      count(case when photos.created_at >= trips.start_date and photos.created_at < trips.end_date then distinct(photos.id) end) as during,
      count(case when photos.created_at >= trips.end_date then distinct(photos.id) end) as after
       from trips
        inner join trip_segments
          on trip_segments.trip_id = trips.id
          inner join trip_segment_photos
            on trip_segment_photos.trip_segment_id = trip_segments.id
            inner join photos

zacclark

<% @person.current_employments.each do |emp| %>
  <% f.fields_for :employments, emp do |em| %>
  <%= em.hidden_field :id %>
  <% em.fields_for :company, emp.company do |co| %>
  <%= co.hidden_field :id %>
  <% co.fields_for :special_dataset do |cd| %>
  <%= cd.hidden_field :id %>
  <% em.fields_for :postal_address do |pa| %>
  <% em.fields_for :assistant, emp.assistant do |ast| %>

zacclark

OO Analysis & Design, Homework #1, Zachary Clark (810876200)

Problem 1.

What is the difference between abstraction and encapsulation? Define both terms and then discuss the difference. Provide examples to support your definitions and discussion.

Encapsulation hides data, sealing it away from external use. This helps with loose coupling. It prevents data from "bleeding" from one part of the application into others, or being accessible in places it should not.

Abstraction defines what features a class provides and what services it can perform. Abstractions hide away how the code functions, so the programmer is only concerned with the results. If abstractions are used properly, the entire foundational data structure can be changed without affecting code relying on that class.

zacclark

stacking_search = params[:search_modifier]
if stacking_search
  original = session[:last_query]
  fresh = query
  join = "AND"
  join = "OR" if params[:search_modifier] == "expand"
  query = ["( #{original.shift} ) #{join} ( #{fresh.shift} )"] + (original + fresh)
  # this is a useful spot for a debugger if we need to inspect the joined query
  # debugger
end

zacclark

class Duck
  def initialize(name = "Ducky")
    set_quack
    @name = name
  end
  
  def quack
    @quack_behavior.quack
  end
  

zacclark

# http://spreadsheet.rubyforge.org/file.GUIDE.html

require 'rubygems'
require 'spreadsheet'

book = Spreadsheet::Workbook.new
sheet1 = book.create_worksheet

sheet1.name = 'Testing Naming'

zacclark

require "rexml/document"

# http://api.wunderground.com/auto/wui/geo/ForecastXML/index.xml?query=Boulder,CO

require 'net/http'
Net::HTTP.start("api.wunderground.com") do |http|
    resp = http.get("/auto/wui/geo/ForecastXML/index.xml?query=Boulder,CO")
    open("weather.xml", "wb") do |file|
        file.write(resp.body)
    end

zacclark

class FlatPerson
  
  def initialize(person)
    raise TypeMismatch unless person.class == Person
    
    person.attribute_names.each do |attr|
      eval("@#{attr} = person.#{attr}")
    end
    
  end

zacclark

class FlatPerson
  
  def initialize(person)
    raise TypeMismatch unless person.class == Person
    
    emp = person.employments_to_edit[0] || Employment.new
    emp.company ||= Company.new
    comp = emp.company
    comp.cisco_dataset ||= CiscoDataset.new
    cd = comp.cisco_dataset

zacclark

f = File.open("./theme")
waiting = true
f.each_line do |line|
  if waiting
    #puts line
    waiting = false if line.to_s == "[default]\r\n"
  else
    arr = line.split(" ")
    #puts arr.inspect
    puts "<key>#{arr[0]}</key>"