khalilgharbaoui

You can jump to code directly

How it works?

1. Cache product pages

Following line does't have /products.* page. This tells Nginx to cache all product pages by default.

Idea is fast loading product pages will improve scalability of a store and also conversion.

khalilgharbaoui

types {
    text/html                             html htm shtml;
    text/css                              css;
    text/xml                              xml;
    image/gif                             gif;
    image/jpeg                            jpeg jpg;
    application/x-javascript              js;
    application/atom+xml                  atom;
    application/rss+xml                   rss;

khalilgharbaoui

class ParamsSlicer
  def initialize(params, *whitelist)
    @params = params
    @nested_whitelist = whitelist.extract_options!
    @whitelist = whitelist
  end

  def call
    params.slice(*whitelist).tap do |result|
      nested_whitelist.each do |k, v|

khalilgharbaoui

namespace :database do

  task fat_tables: :environment do
    c = ActiveRecord::Base.connection

    max_table_name_width = 0

    tables = c.tables.sort_by do |t|
      max_table_name_width = t.length if t.length > max_table_name_width

khalilgharbaoui

One liner for deleting images from a v2 docker registry

Just plug in your own values for registry and repo/image name.

registry='localhost:5000'
name='my-image'
curl -v -sSL -X DELETE "http://${registry}/v2/${name}/manifests/$(
    curl -sSL -I \
        -H "Accept: application/vnd.docker.distribution.manifest.v2+json" \

khalilgharbaoui

/(#(?:[0-9a-fA-F]{2}){2,4}$|(#[0-9a-fA-F]{3}$)|(rgb|hsl)a?\((-?\d+%?[,\s]+){2,3}\s*[\d\.]+%?\)$|black$|silver$|gray$|whitesmoke$|maroon$|red$|purple$|fuchsia$|green$|lime$|olivedrab$|yellow$|navy$|blue$|teal$|aquamarine$|orange$|aliceblue$|antiquewhite$|aqua$|azure$|beige$|bisque$|blanchedalmond$|blueviolet$|brown$|burlywood$|cadetblue$|chartreuse$|chocolate$|coral$|cornflowerblue$|cornsilk$|crimson$|darkblue$|darkcyan$|darkgoldenrod$|darkgray$|darkgreen$|darkgrey$|darkkhaki$|darkmagenta$|darkolivegreen$|darkorange$|darkorchid$|darkred$|darksalmon$|darkseagreen$|darkslateblue$|darkslategray$|darkslategrey$|darkturquoise$|darkviolet$|deeppink$|deepskyblue$|dimgray$|dimgrey$|dodgerblue$|firebrick$|floralwhite$|forestgreen$|gainsboro$|ghostwhite$|goldenrod$|gold$|greenyellow$|grey$|honeydew$|hotpink$|indianred$|indigo$|ivory$|khaki$|lavenderblush$|lavender$|lawngreen$|lemonchiffon$|lightblue$|lightcoral$|lightcyan$|lightgoldenrodyellow$|lightgray$|lightgreen$|lightgrey$|lightpink$|lightsalmon$|lightseagreen$|lig

khalilgharbaoui

TL;DR

Install Postgres 9.6, and then:

sudo pg_dropcluster 9.6 main --stop
sudo pg_upgradecluster 9.5 main
sudo pg_dropcluster 9.5 main

khalilgharbaoui

require 'rubygems'
require 'rspec'
require 'webmock'
require 'vcr'
require 'pry'

# in a Rails app, this would be in an initializer
WebMock.disable_net_connect!(
  allow_localhost: true,
  net_http_connect_on_start: true

khalilgharbaoui

  # Use: it { should accept_nested_attributes_for(:association_name).and_accept({valid_values => true}).but_reject({ :reject_if_nil => nil })}
  RSpec::Matchers.define :accept_nested_attributes_for do |association|
    match do |model|
      @model = model
      @nested_att_present = model.respond_to?("#{association}_attributes=".to_sym)
      if @nested_att_present && @reject
        model.send("#{association}_attributes=".to_sym,[@reject])
        @reject_success = model.send("#{association}").empty?
      end
      model.send("#{association}").clear

khalilgharbaoui

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")