ccc_pr_427.rb

begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'
  gem 'rails', '5.1.0'  # use correct rails version
  gem 'cancancan' # use correct cancancan version
  gem 'sqlite3' # use another DB if necessary
end

require 'active_record'
require 'cancancan'
require 'cancan/model_adapters/active_record_adapter'
require 'cancan/model_adapters/active_record_4_adapter'
require 'minitest/autorun'
require 'logger'

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

# create your tables here
ActiveRecord::Schema.define do
  create_table :bananas, force: true  do |t|
    t.string :species
  end
end

class Banana < ActiveRecord::Base
end

class Ability
  include CanCan::Ability

  def initialize(user)
    can :eat, Banana, species: /Musa/
  end
end

class BugTest < Minitest::Test
  def test_bug
    ability = Ability.new(nil)
    banana = Banana.new(species: 'Musa acuminata')
    assert(
      ability.can?(:eat, banana),
      "The `banana` is of the family /Musa/, therefore I should be able to eat it."
    )
    # cancan is comparing the regex /Musa/ and the string 'Musa acuminata' using
    # the equality operator `==`, which does not do what users think it should do.
  end
end