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Some questions about optional dependencies

1. A small ruby library

I'm writing a small Ruby library:

class FizzBuzzEndpoint

  def call(env)

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// data density example
// shows how storing/sorting data by key can reduce I/O drastically in MongoDB
// diskloc gives file # and offset of a given document, divide by 512 for block #
// 2011 kcg

// start clean
db.disktest_noorg.drop();
db.disktest_org.drop();

// create some random data in non userid dense form

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import pymongo
import random
from collections import defaultdict
import time
import sys
from pymongo import Connection
connection = Connection()
connection.drop_database('test_db')
collection = connection['test_db']['testing']

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module Export
  module V1
    class GroupSerializer < ActiveModel::Serializers

      attributes :items

      def items
        docs = object.items.order_by(:position.asc)
        ItemsSerializer.new(docs, special_options).serializable_hash
      end

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def self.fully_approved_query_value
  MultiTenancy.current_version.locales.inject({}) do |result, locale|
    result.merge(locale.to_s => true)
  end
end

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module Models
  module GroupByCaching
    extend ActiveSupport::Concern

    included do
      CACHE_KEY_PREFIX = "#{self.name.collectionize}_grouped_by"
    end


    module ClassMethods

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/**
 * Select2
 *
 * Renders Select2 - jQuery based replacement for select boxes
 *
 * Simply pass a 'config' object on your schema, with any options to pass into Select2.
 * See http://ivaynberg.github.com/select2/#documentation
 */

Backbone.Form.editors.Select2 = Backbone.Form.editors.Base.extend({

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class Group
  include Mongoid::Document

  recursively_embeds_many
end

# remove from old parent
@group.parent_group.child_groups.delete @group

# set new state

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# multilingual analysis for title search taken from :
# http://jprante.github.com/lessons/2012/05/16/multilingual-analysis-for-title-search.html
# or alternatively here (where the used plugin comes from, is less descriptive but has more technical details)
# https://github.com/yakaz/elasticsearch-analysis-combo
analysis:
  filter:
    germansnow:
      type: snowball
      language: German2
    ngram_filter:

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curl -XDELETE 'localhost:9200/test'
echo 

curl -XPUT 'localhost:9200/test?pretty' -d '{
	"mappings" : {
		"test" : {
			"properties" : {
				"text_de" : {
					"type" : "string"
				}