IanWhitney

# Referenced in Design Is Refactoring post http://designisrefactoring.com/2016/02/03/factories/
# This code takes the previous example and extends it. Classes can now define 'roles' they satisfy
# and each class can satisfy more than one role.
#
# At load time, these roles are examined and recorded in registries. 
# In this example there's a CampusLikeRegistry that contains every class that says it's campus-like.
# But you could have any number of registries.

require 'singleton'
require 'forwardable'

IanWhitney

[1,2,3][3]
#=> nil
# Ask for element outside of the array, get nil. cool.

[1,2,3][3,1]
#=> []
#=> Ask for a 1-element slice that starts outside of the array, get an empty array. Ok?

[1,2,3][4]
#=> nil

IanWhitney

receipt_id = _your_receipt_id_
r = Etl::Receipt.find(receipt_id)
r.audits.each do |a|
  Etl::Audit::Facet.all_classes.each do |f|
    f.where(etl_audit_id: a.id).delete_all
  end
end

s = Etl::Service.new(r)
s.extract_facets

IanWhitney

# From the docs of Kernel.array
#   First tries to call to_ary on arg, then to_a.
#   http://ruby-doc.org/core-2.2.3/Kernel.html#method-i-Array

# Ok, so does a struct respond to to_ary?

Monkey = Struct.new(:name, :favorite_color)
m = Monkey.new("George", "Yellow")
m.respond_to?(:to_ary)
#=> false

IanWhitney

class Bob
  def reply_to(statement)
    statement.reply(self)
  rescue
    default_reply
  end

  def reply_to_silence
    "Fine. Be that way!"
  end

IanWhitney

class Bob
  def reply_to(statement)
    public_send("reply_to_#{statement.class}".downcase.to_sym)
  rescue NoMethodError
    default_reply
  end

  def reply_to_silence
    "Fine. Be that way!"
  end

IanWhitney

GIT
  remote: git://github.com/rails/rails.git
  revision: 5d543c5996da986ba8d979cd83236e130a3bd953
  tag: v4.2.0.rc1
  specs:
    actionmailer (4.2.0.rc1)
      actionpack (= 4.2.0.rc1)
      actionview (= 4.2.0.rc1)
      activejob (= 4.2.0.rc1)
      mail (~> 2.5, >= 2.5.4)

IanWhitney

# Array of an openstruct works as you'd expect, but to_a does not.  
# OpenStruct descends from Object, Kernel, BasicObject. None of which implement to_a. So that explains that.
# I'm a little unclear on why Array(os) is working. Array(Object.new) works, and OpenStruct descends directly from Object.
# BUT, the Array docs say that it calls .to_ary or .to_a on the argument, and an OpenStruct instance responds to neither of those.
# So....?
require 'ostruct'
#=> true
os = OpenStruct.new
#=> #<OpenStruct>
os.prop1 = "test"

IanWhitney

@athlete = Athlete.find(4329615)
@active_progs = @athlete.future_complete_academic_program_memberships.all(:conditions => "prog_status in ('AC', 'CM')")
@old_progs = @athlete.future_complete_academic_program_memberships.all(:conditions => "prog_status not in ('AC', 'CM')", :order => "action_dt desc")
@academic_tree_paths = @athlete.future_academic_tree_paths

prog = @active_progs.first

@academic_tree_paths.detect { |tp| tp.ps_acad_prog_stdnt_car_nbr == prog.stdnt_car_nbr && tp.ps_acad_prog_acad_career == prog.acad_career}

IanWhitney

x = Hash.new{|h,k| h[k] = []}