krisleech

class OrderController
  def new
    @order = Order.new
  end

  def create
    command = CreateOrder.new(current_user, params[:order])
    command.execute(:success => lambda { redirect_to orders_path },
                    :failure => lambda { |order| @order = order; render :action => :new })
  end

nathany

# add something like this to config.ru
# see https://github.com/kzk/unicorn-worker-killer

if Integer(ENV['UNICORN_KILLER'] || 0) != 0
  require 'unicorn/worker_killer'
  # Max memory size (RSS) per worker
  use Unicorn::WorkerKiller::Oom, (350*(1024**2)), (400*(1024**2)), 30, true
end

giannisp

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