Arnab Deka arnab

Co-founder of Metacast app.

arnab / rails-find-joins.rb

Created November 2, 2009 04:01

If you want to load data from 2 tables (with a belongs_to/has_many relation)

	metrics_with_inputs = Revision.find(
	:all,
	:conditions => { :id => self.revisions.map { \|r\| r.id } },
	:select => 'revisions.metric, revisions.snap_date, revisions.updated_at,
	inputs.author, inputs.as_of_date, inputs.units',
	:joins => 'join inputs on inputs.revision_id = revisions.id',
	:order => 'revisions.metric, revisions.snap_date, revisions.updated_at'
	)

arnab / columnize.rb

Created December 18, 2009 19:48

	def columnize(arr, columns)
	size_in_group = arr.size / columns
	if arr.size % columns != 0
	size_in_group += 1
	end

	arr_grouped = [ ]
	size_in_group.times do \|m\|
	columns.times do \|i\|
	arr_grouped[i] \|\|= []

arnab / sort_enums_by_given_custom_order.rb

Created December 31, 2009 00:46

Sort an enumerable (animals) given a specific order (animal_class_order). Important Lines: 22-24

	animals = [
	{ :name => 'Frog', :class => 'Amphibian' },
	{ :name => 'Butterfly', :class => 'Arthropod' },
	{ :name => 'Eagle', :class => 'Bird' },
	{ :name => 'Seahorse', :class => 'Fish' },
	{ :name => 'Dog', :class => 'Mammal' },
	{ :name => 'Man', :class => 'Mammal' },
	{ :name => 'Crocodile', :class => 'Reptile' },
	]
	# Note that Fish and Reptiles are missing from the following

arnab / russian-peasant-multiplication.rb

Created January 29, 2010 22:31

Simple implementation of Russian Peasant Multiplication with tests

	# http://mathforum.org/dr.math/faq/faq.peasant.html
	# http://en.wikipedia.org/wiki/Ancient_Egyptian_multiplication

	module RussianPeasantMultiplication
	def russian_peasant_multiply(b)
	numbers_to_add = []
	a, b = [self, b].sort #So we have the smaller number as the first

	negative_operands = [a, b].select { \|n\| n < 0 }
	result_should_be_negative = negative_operands.size.odd? # or negative_operands.size == 1

arnab / top_n_tags.rb

Created February 26, 2010 05:32

Given lots of tags, keep a running count of the top-n

	require "pp"

	class TagManager
	def initialize(top_tags_to_keep)
	@all_tags = Hash.new(0)
	@top_tags = []
	@top_tags_to_keep = top_tags_to_keep
	end

	def search(tag)

arnab / umpiring-schdeule-generator.rb

Created March 8, 2010 22:29

randomnize a few players

arnab / greplin-challenge-level-1.rb

Created October 9, 2010 02:40

in reply to http://challenge.greplin.com

	require "pp"

	class String
	def all_substrings
	substrs = []
	start_index, end_index = [0, self.length - 1]
	start_index.upto end_index do \|i\|
	i.upto end_index do \|j\|
	# puts "#{self}[#{i}, #{j}] => #{ss}"
	substrs << self[i..j]

arnab / sdb_put_attributes_with_fog.rb

Created October 18, 2010 19:52

SimpleDB put_attributes using fog

arnab / NumberGuess.java

Created November 12, 2010 06:50

The number guess game in Common Lisp (from Land of Lisp), to compare to the Ruby implementation

	import java.io.Console;

	public class NumberGuess {
	private int small;
	private int big;
	private int guess;

	private void guess(){
	this.guess = nextGuess();
	String verdict = System.console().readLine(guess + ": smaller/bigger/start-over? ");

arnab / running-fog-specs.sh

Created November 16, 2010 17:14

fog spec errors (756 in the whole suite)

	ArgumentError in 'Fog::Vcloud power_on with a vapp uri that doesn't exist should == {:type=>"application/vnd.vmware.vcloud.org+xml", :name=>"Boom Inc.", :href=>"https://fakey.com/api/v0.8/MockOrganization/2174953160"}'
	Unrecognized arguments: username, module, password, versions_uri
	/Users/arnab/code/github/fog/lib/fog/core/service.rb:141:in `validate_arguments'
	/Users/arnab/code/github/fog/lib/fog/core/service.rb:43:in `new'
	/Users/arnab/code/github/fog/spec/vcloud/terremark/ecloud/requests/../../../spec_helper.rb:276: