kivanio

require 'active_support/core_ext/time'

class BusinessHoursFeature
  # This feature is only available between the hours of 10am and 4pm
  def enabled?
    Time.use_zone('Pacific Time (US & Canada)') do
      now     = Time.zone.now
      am, pm  = Time.zone.parse('10:00'), Time.zone.parse('16:00')
      weekday = !(now.saturday? || now.sunday?)

kivanio

#http://dev.mensfeld.pl/2014/03/rack-argument-error-invalid-byte-sequence-in-utf-8/
class Utf8Sanitizer
  SANITIZE_ENV_KEYS = %w(
    HTTP_REFERER
    PATH_INFO
    REQUEST_URI
    REQUEST_PATH
    QUERY_STRING
  )
 

kivanio

module Reportable
  extend ActiveSupport::Concern

  module ClassMethods
    # Chain on a scope and specify the fields to extract.
    # Example:
    #   User.enabled.report %{
    #     :email_opt_in,
    #     'created_at as sign_up_date'
    #   }

kivanio

Micro Tooltip

Things it does:

• a tooltip on hover
• hide on mouseout
• hide if you hover the tip itself
• unobtruscive javascurpt

Configuration:

kivanio

# app/models/post.rb

class Post
  
  searchable :auto_index => false, :auto_remove => false do
    text :title
    text :body
  end
  
  after_commit   :sidekiq_solr_update, :if => :persisted?

kivanio

class DailyWorker
  include Sidekiq::Worker
  include Sidetiq::Schedulable

  # Daily at midnight
  recurrence { daily }

  def perform
    User.includes(:profile).where("profiles.daily_email" => true) do |u|
      ReminderMailer.remind_email(u).deliver

kivanio

module SidekiqIndexing
  module SearchableOverride
    extend ActiveSupport::Concern

    module InstanceOverrides
      def solr_index
        SunspotIndexer.perform_async(self.class.to_s, self.id)
      end
    end

kivanio

# A Sidekiq background job worker tha knows how to render Rails views
# Don't worry, I *think* I know what I'm doing ;)
class RenderWorker < AbstractController::Base
  include AbstractController::Rendering
  include AbstractController::Logger  # dependency from actionview calling logging
  include Rails.application.routes.url_helpers
  include Sidekiq::Worker
  
  append_view_path "#{Rails.root}/app/views"  # from AbstractController::ViewPaths

kivanio

class SalesReportWorker < ApplicationController
  include Sidekiq::Worker
  sidekiq_options backtrace: true, retry: false

  self.view_paths = "app/views"                     # Where to look for view templates
  
  def perform(request_ident, params)
    @_response = ActionDispatch::Response.new       # Needed to avoid "ActionController::RackDelegation#content_type 
                                                    # delegated to @_response.content_type, but @_response is nil" error
    ...

kivanio

/* How to calculate postgreSQL database size in disk ? */

SELECT pg_size_pretty(pg_database_size('thedbname'));

/* Calculate size of a table including or excluding the index */

SELECT pg_size_pretty(pg_total_relation_size('big_table'));
SELECT pg_size_pretty(pg_relation_size('big_table')); /* without index */

/* See indexes on a table with `\d tablename` */