BrianSigafoos

PSQL

Magic words:

psql -U postgres

If run with -E flag, it will describe the underlaying queries of the \ commands (cool for learning!).

Most \d commands support additional param of __schema__.name__ and accept wildcards like *.*

BrianSigafoos

Gemfile favorites

group :test do
  # Minitest - Rails default, but updated more often via gem https://github.com/seattlerb/minitest
  gem 'minitest'

  # Better reporting for minitiest - ala Rspec https://github.com/kern/minitest-reporters
  gem 'minitest-reporters'

BrianSigafoos

Rails + React + PostgreSQL on Heroku

$ rails new <app-name> --database=postgresql --webpack=react
$ cd <app-name>
$ echo '.idea' >> .gitignore      # remove RubyMine's config
$ echo "ruby '2.4.0'" >> Gemfile  # for Heroku Ruby version
$ git add .
$ git commit -m "Initial commit"

# Create new repo on GitHub with same name...

BrianSigafoos

Fixtures

DEFAULTS: &DEFAULTS
  payment_trail:      $LABEL
  identifier:         $LABEL_stripe_key
  amount_cents:       <%= AMOUNT_CENTS[:one_h] %>
  paid:               false
  status:             <%= Charge::STATUSES[0] %>
  state:              <%= Charge::STATES[0] %>
  created_at:         now  # special `now` or can use <%= 1.week.from_now %>

BrianSigafoos

Dynamic Method

# Decide how to define a method at runtime
class C
end

C.class_eval do
  define_method :my_method do
    'a dynamic method'
 end

BrianSigafoos

Rails Generators

rails generate <type> --help # for examples

# Model (+ migration, test, fixtures)
rails generate model NAME [field[:type][:index] field[:type][:index]] [options]

rails generate model post title:string blog:references published:boolean position:integer
rails generate model product supplier:references{polymorphic}

BrianSigafoos

Model layout & validations

class User < ActiveRecord::Base
  # keep the default scope first (if any)
  default_scope { where(active: true) }

  # constants come up next
  COLORS = %w(red green blue)

  # afterwards we put attr related macros

BrianSigafoos

curl testing a REST API

# HEAD request: -I 
$ curl -I  http://0.0.0.0:3000/posts

# -i (--include) protocol headers and -X (--request) for GET, PUT, DELETE
$ curl -i -X HEAD http://0.0.0.0:3000/posts

# prettify JSON results with python -mjson.tool 
$ curl ... | python -mjson.tool

BrianSigafoos

An introduction to curl using GitHub's API.

Basics

Makes a basic GET request to the specifed URI

curl https://api.github.com/users/caspyin

Includes HTTP-Header information in the output

BrianSigafoos

Capybara

save_and_open_page

Matchers

have_button(locator)