hayesr

Audit this entire codebase for materially useful simplifications in its data structures, state representation, control flow, algorithms, and ownership.

This is an audit-only exercise. Do not edit files, run tests, implement recommendations, commit, or push. Read-only inspection commands are allowed.

You are the coordinator. Continue until the complete codebase has been reviewed and the final audit is validated.

1. Establish the coverage contract

Inspect the repository and inventory every identifiable subsystem.

hayesr

# Your component classes can inherit from this
class ComponentPresenter
  # A 'macro' to define the partial path at the top of the class like:
  #   partial_path: 'components/popover'
  # Or just define your own partial_path method
  #
  def self.partial_path(path)
    define_method(:partial_path) do
      path
    end

hayesr

tracks_with_date = [
  ["6GZeeRql1kto2a7koIve9i", "2018-11-13 05:02:50 UTC"],
  ["6pXJV9kSdjyAcDsM32ftLK", "2018-11-13 05:02:50 UTC"],
  ["5x9jMerOQr7oTF1GO4STRY", "2018-11-13 05:02:50 UTC"],
  ["2hLTFcVb0k2xpHXZblhu7Y", "2018-11-13 05:02:50 UTC"],
  ["77L5jfCpmpkDma5lXjG6oX", "2018-11-13 05:02:50 UTC"],
  ["6rux2bYOCSr2woxnQsoUE3", "2018-11-13 05:02:50 UTC"],
  ["0gjknY5vRTKbzMos2hhfN7", "2018-11-13 05:02:50 UTC"],
  ["0ZHn1GiKfyLgpvEks2wBcn", "2018-11-13 05:02:50 UTC"],
  ["25EmPX0QaVUOzi2sG3fZEp", "2018-11-13 05:02:50 UTC"],

hayesr

# config/routes.rb
resources :documents do
  scope module: 'documents' do
    resources :versions do
      post :restore, on: :member
    end

    resource :lock
  end
end

hayesr

Finding which tables need extra indexes

pg_stat_user_tables is a fantastic system view that can show us invaluable information about the tables in our databases and can be used in diagnosing performance issues. Vacuum statistics like last_autovacuum and n_dead_tup will show if there are tables that aren’t being vacuumed efficiently and n_tup_hot_upd if you aren't performing HOT updates.

One of the things to look for first, though, is if there are tables that need new indexes as this can have a significant impact

hayesr

# 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")

hayesr

Get colors from a photo using ImageMagick

Command

Using image: https://unsplash.com/new?photo=5RydGpXvpxE by Thomas Bühler

convert thomas-buhler-301493.jpg -colors 16 -depth 8 -format '%c' histogram:info:- \
| sort --reverse --numeric-sort

hayesr

/(?:get|put|post|patch)\s+:\w+,\s+(?!params).+/

hayesr

module ApplicationHelper
  def present(object, klass = nil)
    klass ||= "#{object.class}Presenter".constantize
    presenter = klass.new(object, self)
    yield presenter if block_given?
    presenter
  end
end

hayesr

function preresolve(dq)
  if dq.qname:equal("www.google.com") then
    dq:addAnswer(pdns.CNAME, "forcesafesearch.google.com.")
    dq.rcode = 0
    dq.followupFunction="followCNAMERecords" -- this makes PowerDNS lookup your CNAME
    return true;
  end

  return false;
end