DmytroVasin

How to run examples

1. Run $ createdb uniq-db-test to create DB
2. Run example with Ruby (e.g., $ ruby 1_find_or_create_by_single_thread.rb)

Benchmark output

With many successful INSERTs

Warming up --------------------------------------

DmytroVasin

namespace :db do
  desc 'Convert development DB to Rails test fixtures'
  task to_fixtures: :environment do
    TABLES_TO_SKIP = %w[ar_internal_metadata delayed_jobs schema_info schema_migrations].freeze

    begin
      ActiveRecord::Base.establish_connection
      ActiveRecord::Base.connection.tables.each do |table_name|
        next if TABLES_TO_SKIP.include?(table_name)

DmytroVasin

class PostsController < ApplicationController
  def index
    render cell: :index, model: posts
  end

  def show
    post_view_registrar.commit_view
    show_post_page
  end

DmytroVasin

## EASY:
```
def trap(height)
    drops = 0
    
    height.each_with_index do |current_height, i|
        max_occupancy = [height[0..i].max, height[i..-1].max].min
        drops += max_occupancy - current_height
    end
    

DmytroVasin

module RuboCop
  module Cop
    module CustomCops
      class TimecopReplacerCop < Cop
        # ...
        def autocorrect(arg_pair)
          date_string = eval(arg_pair.value.source).strftime('%Y-%m-%dT%H:%M:%S%z')
          new_source = String.new("freezed_time: '#{date_string}'")

          ->(corrector) do

DmytroVasin

module RuboCop
  module Cop
    module CustomCops
      class TimecopReplacerCop < Cop
        MSG = 'Broken rule'.freeze

        def on_send(node)
          return unless [:describe, :context, :it, :xit, :it_behaves_like].include?(node.method_name)
          return unless node.last_argument&.hash_type? # Syntax: "it { is_expected.to be true }"

DmytroVasin

rubocop --format simple \
  --require /absolute/path/to/rewrite_time_cop.rb \
  --only CustomCops/TimecopReplacerCop

DmytroVasin

# BEFORE: 
describe 'some_description', vcr: true, freezed_time: Time.utc(2016,12,9,15,0,0) do
describe 'some_description', freezed_date: Date.new(2017, 9, 4) do
context 'some_description', freezed_time: Time.new(2016, 0o2, 22, 0o0, 11, 44, "+00:00") do
context 'some_description', freezed_date: Time.new(2016, 01, 20, 17, 43, 56, '+03:00') do
context 'some_description', freezed_date: DateTime.new(2017, 3, 17, 7, 40) do
it 'some_description', freezed_date: Time.utc(2016,11,28,15) do

# AFTER: 
describe 'some_description', vcr: true, freezed_time: '2016-12-09T15:00:00+0000' do

DmytroVasin

# The main idea to install three libraries.
# These libraries can't be symlinked because they are macOs-provided
# > Refusing to link macOS-provided software: libxml2
# So, You need to specify lib and include directories.

brew install libxml2
brew install libxslt
brew install libiconv

gem install nokogiri -v '1.6.2.1' -- \

DmytroVasin

# Идея решения:
# Финальное число точек должно составляется из
# 1. Точки в центре ( начало круга ) ( На рисунке => "0" )
# 2. Точек лежащих на осях координат, умноженное на четыре
#   - так как 4тыре направляющие ( На рисунке => "_" )

# 3. Точек лежащих на диагональных линиях, умноженное на четыре
#   - так как 4тыре направляющие ( На рисунке => "*" )

# 4. Точки лежащие над и под диагональными линиями, умножаем на 8мь