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  frontend:
    build:
      context: .
      dockerfile: Dockerfile.e2e
    command: nginx
    networks:
      main:
        aliases:
          - frontend
    ports:

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e2e:
  adapter:  postgresql
  host:     postgres
  encoding: unicode
  database: your_project_test
  pool:     5
  username: postgres
  password: your_password

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FROM quay.io/netguru/baseimage:0.10.1                                 # Image containing all dependecies like imagemagick etc

ENV RUBY_VERSION 2.4.2                                                # To get proper ruby

## Install Ruby & Dependencies
RUN \                                                                 # Install ruby
  apt-get update -q && \
  apt-get install -q libcurl3 && \
  apt-get install -q -y cron && \
  ruby-install --system --cleanup ruby $RUBY_VERSION -- --disable-install-rdoc && \

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Capybara.register_driver :chrome do |app|
  Capybara::Selenium::Driver.new(
    app,
    browser: :chrome,
    desired_capabilities: { "chromeOptions" => { "args" => %w[window-size=1024,768] } },
  )
end

if Rails.env.test?
  Capybara.register_driver :selenium do |app|

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version: '2'                                       # Version of composer
services:
  backend:                                         # Backend container
    build:
      context: ~/backend                           # Backend should be pulled by git to this location
      dockerfile: docker/Dockerfile.e2e            # The location of Dockerfile, relative to context above
    depends_on:                                    # The containers below will be resolved and loaded before backed
      - redis
      - postgres
      - frontend

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machine:
  node:
    version: 8.2.1
  pre:
    - mkdir ~/.cache/yarn
    - curl -sSL https://s3.amazonaws.com/circle-downloads/install-circleci-docker.sh | bash -s -- 1.10.0          # Download Docker 1.10.0 (linked to docker-compose v2) for CircleCI
    - >-
      GIT_SSH_COMMAND='ssh -i ~/.ssh/id_jaacoo-backend-e2e-tests-deploy-key-for-jaacoo-repo'
      git clone git@github.com:netguru/jaacoo.git ~/backend && cd ~/backend                   # Download backend to ~/backend. The SSH for backend had to be placed in CircleCI build setup page
    - set -o allexport; source "${HOME}/${CIRCLE_PROJECT_REPONAME}/.env"; set +o allexport

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Important notes

1. Use ActiveJob
2. Use different adapters: Sidekiq, Resque
3. Backend adapters depend on workers to execute jobs
4. Use queues for different kind of jobs / tasks: mailing, maintenance, etc.
5. Job perform callbacks are available as well
6. ActionMailer can work as an ActiveJob
7. Watch out for Thread safety - pay attention to instance variables and how they are accessed and changed in concurrent processes. One option is to use Mutex
8. Sidekiq > Resque > DelayedJob (But it depends on the needs and available resources)

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WHY USE

1. Slim-down models / controllers
2. Dissect big queries
3. Make testing queries easier

WHAT IS IT

1. It's a PORO
2. Overrides ActiveRecord standard query methods like all
3. Query objects can be composed (as long as they return relation)
4. QUery objects can be extended by inheritance

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Why not use Object#try

1. It may hide a problem from a plain sight
2. Sometimes it resolves problem which should be there at the first place
3. Implementation of try says nothing about the purpose of what is written

To remember

1. Original article
2. Law of Demeter

When use NullObject

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def create
  @form_object = UserRegistration::RegistrationForm.new(user_params, params[:notify])
  if @form_object.register
    ... #typically we flash and redirect here
  else
    render :new
  end
end