januszm

# alternatively use benchmark/ips

n = 100_000
data = "..."

Benchmark.ips do |benchmark|
  benchmark.report("include?") do
    n.times { data.to_s.downcase.include?('windows') }
  end
  benchmark.report("match?") do

januszm

# Have you ever had to sleep() in Capybara-WebKit to wait for AJAX and/or CSS animations?

describe 'Modal' do
  
  should 'display login errors' do
    visit root_path
    click_link 'My HomeMarks'
    within '#login_area' do
      fill_in 'email', with: 'will@not.work'
      fill_in 'password', with: 'test'

januszm

[database]
log_queries = true

januszm

result = ActiveRecord::Base.connection.execute("select * from my_shapes_table limit 1;")
shape = parser.parse result.values.first.last # .first row , .last column
RGeo::GeoJSON.encode(shape).to_json
# => "{\"type\":\"MultiPolygon\",\"coordinates\":[[[[...]]]]}"

januszm

# Gemfile
# gem "ruby-prof"
# gem "ruby-prof-flamegraph"
# gem "stackprof"

require "ruby-prof"
require "stackprof"

module ProfilerWrapper
  def self.stackprof(name)

januszm

# Currently (2017/2018) it's not possible to change the Ruby 'minor' version (eg. 2.3 => 2.4) using the web console
# However, it's possible using the 'awscli' tool.

brew install awscli # pip install awscli
aws elasticbeanstalk update-environment \
  --solution-stack-name "64bit Amazon Linux 2017.09 v2.6.1 running Ruby 2.4 (Puma)" \
  --environment-name "myappenv1" --region "us-east-2" \
  --version-label "app-1234-210000_120123"

# For Amazon Linux 2

januszm

After automatically updating Postgres to 10.0 via Homebrew, the pg_ctl start command didn't work.
The error was "The data directory was initialized by PostgreSQL version 9.6, which is not compatible with this version 10.0."

Database files have to be updated before starting the server, here are the steps that had to be followed:

# need to have both 9.6.x and latest 10.0 installed, and keep 10.0 as default
brew unlink postgresql
brew install postgresql@9.6
brew unlink postgresql@9.6
brew link postgresql

januszm

# graphite/statsd/grafana setup on new Amazon Linux instance
# add http://graphite/ to grafana as a data source

sudo su
yum update --assumeyes
yum install --assumeyes docker
service docker start

docker \
  run \

januszm

<VirtualHost *:80>
  ServerName www.esdb.cn
  ServerAlias esdb.cn
  DocumentRoot /home/ubuntu/apps/xxx.com/current/public

  <Directory /home/ubuntu/apps/xxx.com/current/public>
    Options FollowSymLinks
    AllowOverride None
    Require all granted
  </Directory>