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# config/initializers/log_response_time.rb

event_logger = ::Logger.new("#{Rails.root}/log/response_times.log")
event_logger.formatter = proc { |_severity, _datetime, _progname, msg|
  "#{msg}\n"
}

ActiveSupport::Notifications.subscribe('process_action.action_controller') do |_, started, finished, _, stats|
  request_time = (finished - started) * 1000
  controller = stats[:controller][0..-11].underscore

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class ApplicationController < ActionController::Base
  around_action :track_object_allocation

  def allocation_logger
    @@allocation_logger ||= begin
      logger = Logger.new("#{Rails.root}/log/allocation_trace.log")
      logger.formatter = proc { |_severity, _datetime, _progname, msg|
        "#{msg}\n"
      }
      logger

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# app/models/organization.rb
class Organization < ApplicationRecord
  has_many :hqs
  has_many :stores, through: :hqs
end

# app/models/country.rb
class Country < ApplicationRecord
end

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# app/controllers/organizations_controller.rb

class OrganizationsController < ApplicationController
  def index
    @organizations = Organization.all
  end
end

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# app/views/organizations/index.html.erb

<table>
  <tbody>
    <% @organizations.each do |organization| %>
      <tr>
        <td><%= organization.name % ></td>
        <td><%= organization.address %></td>
        <td><%= organization.contact_name %></td>
        <td><%= organization.contact_phone %></td>

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# app/views/organizations/index.json.jbuilder
json.array! @organizations, partial: 'organizations/organization', as: :organization

# app/views/organizations/_organization.json.jbuilder
json.extract! organization, :id, :name, :address, :contact_name, :contact_phone, :created_at, :updated_at

json.url organization_url(organization, format: :json)

json.hqs organization.hqs do |hq|
  json.extract! hq, :id, :name

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# old action
def index
  @organizations = Organization.all
end

# new action
def index
  @organizations = if request.format.html?
                     Organization.includes(hqs: :country).all
                   else

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#
# app/controllers/organizations_controller.rb
#

# old action
def index
  @organizations = Organization.all
end

# new action

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# config/initializers/oj.rb
Oj.optimize_rails

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Code quality:
rubocop - linter
https://github.com/prettier/plugin-ruby - (NOT A GEM!) Prettier for ruby
overcommit - git hooks to run linting before commits, etc
bundler-audit - check your gemfile for outdated gems with security issues
bundler-leak - check your gemfile for gems with known memory leaks
brakeman - rails static code analyzer with a focus on security
sqlint - linter for SQL code (I know, not ruby, but useful for a lot of ruby apps)

Background jobs: