query_methods.rb

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

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

  # Activate the gem you are reporting the issue against.
  gem 'rails', github: 'rails/rails'
  gem 'sqlite3'
  gem 'pry'
end

require 'active_record'
require 'pry'
require 'minitest/autorun'
require 'logger'

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

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

ActiveRecord::Schema.define do
  create_table :posts, force: true
end

class Post < ActiveRecord::Base
  attribute :user_defined_date, :date
end

class BugTest < Minitest::Test
  def test_without_transaction
    post = Post.new

    assert_equal post.user_defined_date?, false

    post.user_defined_date = Date.today
    assert_equal post.user_defined_date?, true 
    # NoMethodError: undefined method `to_i' for Thu, 14 Feb 2019:Date
    # Did you mean?  to_s
    # from /Users/ishii.hiroyuki/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/bundler/gems/rails-e53430fa9af2/activerecord/lib/active_record/attribute_methods/query.rb:22:in `query_attribute'
  end
end