Association Cache Test

association_cache_test.rb

# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem "rails", "6.0.2.rc1"
  gem "sqlite3"
end

require "active_record"
require "minitest/autorun"
require "logger"

ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :customers, force: true do |t|
  end

  create_table :appointments, force: true do |t|
    t.references :customer
  end
end

class Customer < ActiveRecord::Base
  has_many :appointments
end

class Appointment < ActiveRecord::Base
  belongs_to :customer
end

class BugTest < Minitest::Test
  def test_association_cache
    @customer = Customer.create
    a = Appointment.new(customer_id: @customer.id)

    assert_instance_of Customer, a.association(:customer).reader
  end
end