Burak andreyuhai

If you ever get key not found errors when deploying with Capistrano, then:

When ~/.bashrc contains first lines like this, any code afterwards won't be sourced:

# If not running interactively, don't do anything
case $- in
    *i*) ;;
 *) return;;

Deploying Rails 5.2 Applications with New Encrypted Credentials using Capistrano

Source

Copy config/master.key from local filesystem to the production server under <project_root>/shared/config/master.key.
Configure capistrano’s config/deploy.rb to include this line:

Source: Love Your lib Directory By: Brian Cardarella

Using lib/ to extend core, stlib, or a gem

Far too often I’ve needed to extend a class that is being defined outside of my project. There are a few ways to deal with this. You can use a Composite to define a new class that you can then play around with. The downside to this is that I sometimes want to modify a class that is being inherited by other classes. This is when I think it is appropriate to Monkey Patch.

The pattern I have fallen upon is to define a gem_ext/ directory and a gem_ext.rb file in lib. I then make sure the extensions are loaded up using an initializer.

New Ruby software project procedure

First, ensure the following tools are available on the local system and reasonably up to date:

Git
Git-flow
RVM
Bash
SSH

Regexp matching last name, first name and middle name

"Last Name, FirstName Middle Name".match /^(?<last_name>\p{Alpha}+)[,\s]+(?<first_name>\p{Alpha}+)(?: *)(?<middle_name>.+)?$/

How to use Crawlera proxy with Poltergeist/PhantomJS?

require 'capybara'
require 'capybara/poltergeist'

Capybara.register_driver :poltergeist do |app|
    Capybara::Poltergeist::Driver.new(app, js_errors: false, phantomjs_options: ['--ignore-ssl-errors=true','--load-images=no', '--proxy=proxy.crawlera.com:8010', '--ssl-protocol=any'])
end

Add SSH Keys After Fresh Install

chmod 600 ~/.ssh/id_rsa chmod 700 ~/.ssh

Run ssh-add on the client machine, that will add the SSH key to the agent.

Confirm with ssh-add -l (again on the client) that it was indeed added.

sudo apt-get install autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm5 libgdbm-dev -y

source

	library(caret)
	library(ModelMetrics)
	library(recipes)
	library(neuralnet)
	library(sigmoid)

	# Create the dataset
	tt <- data.frame(multiplier = rep(1:10, times = 10), multiplicand = rep(1:10, each = 10))
	tt <- cbind(tt, data.frame(product = tt$multiplier * tt$multiplicand))

	git ls-files --deleted \| xargs git rm
	git commit