CanCanCan Issue

gistfile1.txt

gemfile(true) do
  source 'https://rubygems.org'
  gem 'rails', '4.2.7'
  gem 'cancancan', '1.12.0'
  gem 'pg'

  gem 'rspec-rails'
  gem 'factory_girl_rails'
  gem 'poltergeist'
  gem 'puma'
end


class Computer < ActiveRecord::Base
  belongs_to :device
end

class Device < ActiveRecord::Base
  has_one :computer
end

class Ability
  include CanCan::Ability

  def initialize(user)
    if user.admin || user.group_admin
      can :crud, [Computer, Device], company_id: company.id
    end
  end
end


# factories.rb
FactoryGirl.define do

  factory :company do
    sequence :name do |n|
      "Company #{n}, inc."
    end

    trait :with_everything do
      after(:create) do |c|
        create(:user,     :admin,       company: c)
        create(:user,     :non_admin,   company: c)
        create(:user,     :group_admin, company: c)

        d1 = create(:device,   :active,   :model_1,   company: c)
        d2 = create(:device,   :active,   :model_2,   company: c)
        d3 = create(:device,   :inactive, :model_1,   company: c)

        create(:computer, company: c, device: d1)
        create(:computer, company: c, device: d3)
        create(:computer, company: c, device: nil)
      end
    end
  end


# spec/features/computer_management_spec.rb
feature "Computer management", type: :feature do
  scenario "admin can access all computers" do
    # Given we have a company with computers and devices...
    @company = create(:company, :with_everything)
    @computers = @company.computers
    @computer = @computers.sample
    @devices = @company.devices
    
    # Given I am logged in as an admin...
    @user = @company.users.where("role = ?", "admin").first
    login_as @user
    @current_ability ||= Ability.new(@user)

    visit computers_path

    within("#row_computer_#{@computer.id}") do        # FAILS (unable to find css "#row_computer_271")
      expect(page).to have_content(@computer.name)
    end
  end
end


# View
computers/index.html.erb

# Debugging messages added at the top of view
  <% @current_ability = Ability.new(current_user) %>
  *** Company Computers: <%= @company.computers.collect(&:id) %><br />
  *** Accessible Computers: <%= @company.computers.accessible_by(@current_ability).collect(&:id) %><br />
  *** SQL: <%= @company.computers.accessible_by(Ability.new(current_user)).to_sql %>
  <br /><br />
  *** Company Devices: <%= @company.devices.collect(&:id) %><br />
  *** Accessible devices: <%= @company.devices.accessible_by(@current_ability).collect(&:id) %><br />
  *** SQL: <%= @company.devices.accessible_by(Ability.new(current_user)).to_sql %>

# (HOW IT SHOULD LOOK) Load the page in development:
  *** Company Computers: [2, 14, 17, 4, 1, 3]
  *** Accessible Computers: [2, 14, 17, 4, 1, 3]
  *** SQL: SELECT "computers".* FROM "computers" WHERE "computers"."company_id" = 1 AND "computers"."company_id" = 1 

  *** Company Devices: [3, 9, 4, 2, 1, 7, 11, 5, 6]
  *** Accessible devices: [3, 9, 4, 2, 1, 7, 11, 5, 6]
  *** SQL: SELECT "devices".* FROM "devices" WHERE "devices"."company_id" = 1 AND "devices"."company_id" = 1

# (HOW IT LOOKS DURING TESTING) Screenshot of page during Rspec feature test:
  *** Company Computers: [271, 272, 273, 275]
  *** Accessible Computers: []
  *** SQL: SELECT "computers".* FROM "computers" WHERE "computers"."company_id" = 437 AND "computers"."company_id" = 437

  *** Company Devices: [330, 327, 326, 325]
  *** Accessible devices: []
  *** SQL: SELECT "devices".* FROM "devices" WHERE "devices"."company_id" = 437 AND "devices"."company_id" = 437