From: "Peña, Botp" <botp@...>
Date: 2008-07-22T12:17:06+09:00
Subject: Re: Grouping/Sorting an Array of objects

From: Howard Roberts [mailto:howardroberts@comcast.net] 
# some sample data and pseudo code is here: 
# http://ruby.pastebin.com/m24b5e03
# 
# The output I'm trying to achieve would look like the 
# following, listing 
# first the date, then the information all of the first objects 
# , and then 
# all of the second objects for that date:
# 
# 7/18/08
# 
# 9:00 AM - Orientation
# Location: Conference Room
# Welcome, review agenda, and brief Q&A
# 
# 7:30 AM - First Event
# The Smiths invite you for a casual breakfast at Grumpy's
# 
# 7/19/08
# 8:00 AM - Workshop I
# Location: Room 106
# Boring, all day presentation by Dr. Jones
#....

ok, that is much clearer and complete.

i just modified your last code loop as,

#---code
prev_date=nil
@data.sort_by do |item| 
    t,ampm = item.time.split
    hr,min = t.split ":"
    hr = "0"+hr if hr.size==1
    timenew = ampm+hr+min
    [item.date, timenew, item.class.to_s]
  end.each do |item|
  puts "#{item.date.strftime('%m/%d/%y')}\n\n" if prev_date != item.date
  
  if item.is_a? Meeting
    puts "#{item.time} - #{item.activity}\n"
    puts "Location: #{item.location}\n"
    puts "#{item.description}\n\n"
  else
    puts "#{item.time} - #{item.name}\n"
    puts "#{item.attendees} invite you for a #{item.mood} #{item.activity} at #{item.location}\n\n"
  end
  prev_date = item.date
end
#---code

There's some clobbering of time in there since i arranged by time too :) 

So the output is,


C:\family\ruby>ruby test.rb
07/18/08

7:30 AM - First event
The Smiths invite you for a casual Breakfast at Grumpy's

9:00 AM - Orientation
Location: Conference Room
Welcome, review agenda, and brief Q&A

07/19/08

8:00 AM - Workshop I
Location: Room 106
Boring, all day presentation by Dr. Jones

07/20/08

6:00 PM - Second event
The Jones invite you for a Sociable Dinner at La Nepolara's

07/21/08

7:30 AM - Third event
the Smiths invite you for a casual Breakfast at Mel's

8:00 AM - Workshop II
Location: Room 108
Yet another boring, all day presentation by Dr. Jones

1:00 PM - Third event
Dr. Jones and Staff invite you for a Business Lunch at The Krusty Krab

2:30 PM - Wrap-Up
Location: Room 108
Summary, Q&A, and lots of free goodies

C:\family\ruby>

Is that ok?
Kind regards -botp