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Generating the app

rails new example_app --skip-activerecord \
                        --skip-testunit

Gems

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# Rake task to copy local files to remote server via FTP
# required credentials.yml file, that contains keys:
# server, username, password

require "net/ftp"
require "yaml"

class FTPClient
  attr_reader :remote_path

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Start Cassandra

sudo bin/cassandra -f

Connect to the CLI

bin/cassandra-cli -h 127.0.0.1 -p 9160

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import os
from bottle import route, run, debug, template, request, validate, static_file, error

@route('/')
@route('/index.html')
def index():
    return 'Index'

@route('/static/:filename')
def serve_static(filename):

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/*
 * I encountered a strange bug with Firefox and dynamic background image updates.
 * Background images can't be dynamically updated either through the console or via JavaScript.
 * A simple hack is to update the opacity by a very small increment.
 * This will force Firefox to re-render the background image correctly.
 */

var rand_opacity = ((0.9 + Math.floor((Math.random()*10)+1))/100);
$(el).css({"background-image":new_image, 'opacity':0.9 + rand_opacity});

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import org.apache.http.client._
import org.apache.http.client.methods._
import org.apache.http.impl.client._

class HTTP {

    def getRequest: String = {
        val client = new DefaultHttpClient()
        val httpGet = new HttpGet("http://www.google.com")
        val result = try {

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# Sort columns by param
#
# eg ?sort=id_reverse or ?sort=first_name
#
sort_by_params = lambda do
  sort = params[:sort]
  return 'id' if sort.blank? # sort by id if no params given
  if sort.match(/_reverse/)
    sort.split(/_reverse/).first + " DESC"
  else

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# Export Active Record model as a CSV file
#
def self.render_csv active_record_model
  CSV.generate do |csv|
    csv << active_record_model.column_names
    active_record_model.all.each do |m|
      values = active_record_model.column_names.map{ |f| m.send f.to_sym } 
      csv << values
    end
  end

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Basics

Create a keyspace

create keyspace store with replication_factor=1 and placement_strategy='org.apache.cassandra.locator.SimpleStrategy';

List keyspaces

show keyspaces;

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sudo pip install -U scikit-learn 

sudo pip install -f http://downloads.sourceforge.net/project/matplotlib/matplotlib/matplotlib-1.0/matplotlib-1.0.0.tar.gz matplotlib