rails enum UnknownAttributeError

rails_enum_bug_report.rb

# frozen_string_literal: true

require "bundler/inline"

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

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

  # Activate the gem you are reporting the issue against.
  gem "activerecord", "~> 7.0.0"
  gem "sqlite3"
  gem "mysql2"
end

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

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
# ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: "rails_enum_bug.sqlite")
# ActiveRecord::Base.establish_connection(adapter: "mysql2", database: "rails_enum_bug_report", username: 'root', host: '127.0.0.1')
ActiveRecord::Base.logger = Logger.new(STDOUT)

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

class Post < ActiveRecord::Base
  enum :wrong_attributee, [:default_value, :middle_value, :other_value]
end

class AddAttributeToPosts < ActiveRecord::Migration[7.0]
  def change
    add_column :posts, :wrong_attrib, :integer, default: 0
  end
end

class AddEnumToPosts < ActiveRecord::Migration[7.0]
  def change
    add_column :posts, :wrong_attributee, :integer, default: 0
  end
end

class BugTest < Minitest::Test
  def test_with_outdated_schema_cache
    assert_equal ["id"], Post.column_names # to load schema cache
    AddAttributeToPosts.migrate(:up)
    AddEnumToPosts.migrate(:up)
    assert_equal ["id"], Post.column_names
    new_post = Post.create!(wrong_attributee: :other_value) # column is not in the schema cache, so why no error?
    Post.reset_column_information

    assert_equal "default_value", new_post.reload.wrong_attributee # database default is used
    assert_equal "other_value", new_post.reload.wrong_attributee # actual value is 0 (sqlite default)
  end

  def test_unknown_attribute
    AddAttributeToPosts.migrate(:up)
    Post.reset_column_information

    # expected/normal behaviour
    assert_raises(ActiveModel::UnknownAttributeError) do
      Post.create!(wrong_attribute: :other_value)
    end
    new_post = Post.create!(wrong_attributee: :other_value) # bug, this should raise an error

    assert_nil new_post.reload.wrong_attributee
    assert_nil new_post.reload.wrong_attrib
    assert_equal "other_value", new_post.reload.wrong_attributee # not really expected behaviour :)
  end

  def teardown
    Post.delete_all
    AddAttributeToPosts.migrate(:down)
    AddEnumToPosts.migrate(:down) if ActiveRecord::Base.connection.column_exists?(:posts, :wrong_attributee)
    Post.reset_column_information
  end
end