Diego Rodriguez diecrf

Dear Rubyists,

I just lost a contract because of my code in a Rails project.

The specific code in question is related to a "posting a comment" feature. Here are the details:

In this project, "posting a comment" does not simply entail inserting a row into the database. It involves a procedure to yes, insert a row, but also detect its language, check for spam, send emails, and "share" it to Twitter and Facebook. I believe this algorithm should be encapsulated. I do not believe it belongs in a controller or a model. I do not believe Active Record callbacks should be used.

The "senior developer", whom is the stake holder's right hand man, said this:

Cohesion and Big ActiveRecord Models

One of the problems of big ActiveRecord models is their low cohesion. In Rails we group behaviour around the entities of the domain we're modelling. If we use only ActiveRecord models for that, we'll probably end up with classes full of actions, in most cases, completely unrelated to each other (except for the fact that they act on the same domain entity).

To illustrate the issue let's imagine a big Post AR model of a blog application. In this app, users can add tags to their posts. Since this is the only class with this ability, I decide to put the related logic in the Post model itself. For this, presumably at the beginning of the file, I write a couple of has_many entries for tags and taggings. Then, fifty lines below, along with the rest of scopes, I add one more to find posts by tag name. A couple of hundred lines later, I put a virtual attribute tag_list which will be used to update the associations from a string of tag names separated by commas. Fin

I was tired of Chrome eating all my laptop resources so I decided to put some limit to it with cgroup.

As I was using Ubuntu 12.04 with support for cgroup, I installed the package cgroup-bin and add the following group to the file /etc/cgconfig.conf:

group browsers {
    cpu {
#       Set the relative share of CPU resources equal to 25%
        cpu.shares = "256";
 }

TL;DR

Create a backup:

pg_dumpall > mybackup.sql

Perform the upgrade:

sudo pg_dropcluster 9.4 main --stop

	# Nginx+Unicorn best-practices congifuration guide. Heartbleed fixed.
	# We use latest stable nginx with fresh openssl, zlib and pcre dependencies.
	# Some extra handy modules to use: --with-http_stub_status_module --with-http_gzip_static_module
	#
	# Deployment structure
	#
	# SERVER:
	# /etc/init.d/nginx (1. nginx)
	# /home/app/public_html/app_production/current (Capistrano directory)
	#

	#!/bin/sh
	# /usr/sbin/policy-rc.d
	# Do not stop/restart postgresql. --rduplain 2013-02-13
	# http://askubuntu.com/a/254307/113086

	if [ "$1" = "postgresql" ]; then
	# Forbid stop/restart, or any init action for that matter.
	# 101 - action forbidden by policy
	exit 101
	fi

	#!/usr/bin/env bash

	# This script prints out all of your Redis keys and their size in a human readable format
	# Copyright 2013 Brent O'Connor
	# License: http://www.apache.org/licenses/LICENSE-2.0

	human_size() {
	awk -v sum="$1" ' BEGIN {hum[1024^3]="Gb"; hum[1024^2]="Mb"; hum[1024]="Kb"; for (x=1024^3; x>=1024; x/=1024) { if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x]; break; } } if (sum<1024) print "1kb"; } '
	}

	class DateRange
	def initialize(from, to, step)
	@from, @to, @step = from, to, step
	end

	def each
	current = @from
	while current < @to do
	yield(current)
	current += @step

	# -- encoding : utf-8 --
	module PayStripeHelpers
	# must be used with driver: :selenium (or :sauce?)
	def pay_stripe
	sleep(0.7) # wait for the js to create the popup in response to pressing the button
	within_frame 'stripe_checkout_app' do # must be selenium
	# fill_in 'card_number', with: '4242424242424242' no longer works
	4.times {page.driver.browser.find_element(:id, 'card_number').send_keys('4242')}

	# fill_in 'cc-exp', with: '5/2018' no longer works

	//equivalent of "select count (distinct fieldName) from someTable"
	db.someCollection.aggregate([{ $group: { _id: "$fieldName"} },{ $group: { _id: 1, count: { $sum: 1 } } } ])