mike1011

Resources:

https://github.com/ankane/searchkick

Indexing

By default, simply adding the call 'searchkick' to a model will do an unclever indexing of all fields (but not has_many or belongs_to attributes).

In practice, you'll need to customize what gets indexed. This is done by defining a method on your model called search_data

def search_data

mike1011

Run rails new --help to view all of the options you can pass to rails new:

$ bin/rails new --help
Usage:
  rails new APP_PATH [options]

Options:
  -r, [--ruby=PATH]                                      # Path to the Ruby binary of your choice
                                                         # Default: /Users/eliot/.rbenv/versions/2.2.0/bin/ruby

mike1011

Arel Cheatsheet on Steroids

A (more) complete cheatsheet for Arel, including NamedFunction functions, raw SQL and window functions.

Tables

posts = Arel::Table.new(:posts)
posts = Post.arel_table # ActiveRecord

Table alias

mike1011

module Authenticable

  # Devise methods overwrite
  def current_user
    @current_user ||= User.find_by(authentication_token: request.headers['Authorization'])
  end

  def authenticate_with_token!
    render json: { errors: "Not authenticated" },
                status: :unauthorized unless user_signed_in?

mike1011

DigitalOcean Rails/Ubuntu/NGINX (16.04) Setup

1. Setup
2. Swapfile
3. NGINX
4. ElasticSearch
5. RVM
6. Rails
7. Redis
8. Postgres

mike1011

Ruby and Rails Interview Questions

Ruby

• What is a class?
• What is an object?
• What is a module? Can you tell me the difference between classes and modules?
• Can you tell me the three levels of method access control for classes and modules? What do they imply about the method?
• There are three ways to invoke a method in ruby. Can you give me at least two?
• Explain this ruby idiom: a ||= b

mike1011

http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)

#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?",  {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")

mike1011

Do you have spaces in your Windows username?

1. Create a new account on Windows without a space.

#Installation

1. Download cygwin from http://cygwin.com
2. Run setup-(x86|x86_64).exe
3. Click next until selecting repo to download packages
4. Choose http://cs.vt.edu (gotta go fast), click next

mike1011

# this monit config goes in /etc/monit/conf.d

check process puma_master
  with pidfile  /data/myapp/current/tmp/puma.pid
  start program = "/etc/monit/scripts/puma start"
  stop program = "/etc/monit/scripts/puma stop" 
  group myapp

check process puma_worker_0
  with pidfile /data/myapp/current/tmp/puma_worker_0.pid

mike1011

stats = Sidekiq::Stats.new

stats.queues

stats.enqueued

stats.processed

stats.failed