jaimerson

class Result{
    constructor(public title: string, public imagePath: string) { }
}

class Sentence{
    base: string;
    values: string[];
    results: { [id: string]: Result };
    
    constructor(base: string, values: string[], results: { [id: string]: Result }) {

jaimerson

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'rspec'
end

require 'rspec/autorun'

class Car

jaimerson

require 'rspec/autorun'

class Parent
  def self.descendants
    ObjectSpace.each_object(Class).select { |klass| klass < self }
  end

  def foo
    fail NotImplementedError
  end

jaimerson

set number
set ruler
set hidden
set hlsearch      " highlight search terms
set incsearch     " show search matches as you type
set history=1000         " remember more commands and search history
set undolevels=1000      " use many muchos levels of undo
set wildignore=*.swp,*.bak,*.pyc,*.class
set title                " change the terminal's title
set visualbell           " don't beep

jaimerson

Benchmark.bm do |x|
   x.report(:naive) { BikesReport::NaiveApproach.new.to_a }
   x.report(:ar_and_sql) { BikesReport::ActiveRecordSqlApproach.new.to_a }
   x.report(:view) { BikesReport::ViewApproach.new.to_a }
end
#       user     system      total        real
#  9.430000   0.650000  10.080000 ( 10.306346)
#  0.020000   0.000000   0.020000 (  0.125085)
#  0.010000   0.000000   0.010000 (  0.011208)

jaimerson

class BikesReport::ViewApproach
  def to_a
    BikesReport
      .all
      .as_json
      .map { |r| r.symbolize_keys!.merge!(model: MODELS.fetch(r[:model])) }
  end

  private

jaimerson

class BikesReport < ActiveRecord::Base
  def self.refresh
    Scenic
      .database
      .refresh_materialized_view(table_name, concurrently: false)
  end

  def readonly?
    true
  end

jaimerson

class CreateBikesReports < ActiveRecord::Migration
  def change
    create_view :bikes_reports, materialized: true
  end
end

jaimerson

class CreateBikesReportView < ActiveRecord::Migration
  def change
    reversible do |dir|
      dir.up do
        execute(
          <<-QUERY
            CREATE MATERIALIZED VIEW bikes_reports AS
              SELECT
              bikes.name, bikes.model,
              count(rentals.id) as times_rented,

jaimerson

Benchmark.bm do |x|
   x.report(:naive) { BikesReport::NaiveApproach.new.to_a }
   x.report(:ar_and_sql) { BikesReport::ActiveRecordSqlApproach.new.to_a }
end
#        user     system      total        real
#   9.600000   0.790000  10.390000 ( 10.639153)
#   0.020000   0.000000   0.020000 (  0.137610)