rails_6_0_deprecation.rb

require "bundler/inline"

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

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

  gem "rails", github: "rails/rails", branch: "6-0-stable"
  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 :users, force: true do |t|
    t.string :name
    t.timestamps
  end

  create_table :addresses, force: true do |t|
    t.references :user
    t.string :country
    t.string :city
    t.timestamps
  end
end

class User < ActiveRecord::Base
  has_many :addresses, inverse_of: :user
end

class Address < ActiveRecord::Base
  belongs_to :user
  scope :us, -> { where(country: "US") }
end

ActiveSupport::Deprecation.behavior = :raise

class BugTest < Minitest::Test
  def test_doesnt_raise_deprecation_when_building_single_record
    user = User.create!(name: 'David')
    %w[Chicago Miami].each do |city|
      assert user.addresses.us.build(city: city)
    end
  end

  def test_raises_deprecation_when_building_multiple_records
    user = User.create!(name: 'David')
    assert user.addresses.us.build([{city: "Chicago"}, {city: "Miami"}])
  end
end