arvind02

http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)

#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?",  {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")

arvind02

type below:

brew update
brew install redis

To have launchd start redis now and restart at login:

brew services start redis

arvind02

class ActiveRecord::Base
  
  def self.import!(record_list)
    raise ArgumentError "record_list not an Array of Hashes" unless record_list.is_a?(Array) && record_list.all? {|rec| rec.is_a? Hash }
    return record_list if record_list.empty?

    (1..record_list.count).step(1000).each do |start|
      key_list, value_list = convert_record_list(record_list[start-1..start+999])
      sql = "INSERT INTO #{self.table_name} (#{key_list.join(", ")}) VALUES #{value_list.map {|rec| "(#{rec.join(", ")})" }.join(" ,")}"
      self.connection.insert_sql(sql)

arvind02

require 'rest-client'
RestClient.get(url, headers={})
RestClient.post(url, payload, headers={})

arvind02

#!/usr/bin/env ruby

require 'rubygems'
require 'aws-sdk'

class S3FolderUpload
  attr_reader :folder_path, :total_files, :s3_bucket, :include_folder
  attr_accessor :files

  # Initialize the upload class

arvind02

Integrate Gem/Engine and main Rails app

Overview

• Paths
• Routes
• Add functionality to controller
• Improving (Extending or overriding) Engine functionality
• Helpers
• Assets

arvind02

class Heap
  def initialize(type = :min)
    @type = type
    if @type == :min
      @heap = [-1.0/0]
      @compare = ->(a,b) { (a <=> b) < 0 }
    elsif @type == :max
      @heap = [1.0/0]
      @compare = ->(a,b) { (b <=> a) > 0 }
    else

arvind02

class Node
  attr_accessor :value, :left, :right, :name

  def initialize(options={})
    @value = options[:value]
    @name = options[:name]
  end

  def children
    [@left, @right].compact

arvind02

def sum_hour_glass(c, r, two_d_array)
  top = two_d_array[r][c..c+2].inject(:+)
  center = two_d_array[r +1][c+1]
  bottom = two_d_array[r+2][c..c+2].inject(:+) 
  top + center + bottom
end

def array2D(arr)
  max = -1.0/0.0
  arr.each_with_index do |row, r_i|

arvind02

require 'net/http'
require 'nokogiri'

# This script parse and download image files from html documents
def get_html(url)
  uri = URI(url)
  response = Net::HTTP.start(uri.host, uri.port,
                             :use_ssl => uri.scheme == 'https') do |http|
    resp = http.get(uri.path)
    case resp