rails_inheritance_issue

Gemfile

source 'https://rubygems.org'


gem 'activerecord', '= 3.2.0'
# gem 'activerecord', '~> 4.0.0'
# gem 'activesupport', path: File.expand_path('../rails/activesupport', __FILE__)
# gem 'activemodel', path: File.expand_path('../rails/activemodel', __FILE__)
# gem 'activerecord', path: File.expand_path('../rails/activerecord', __FILE__)
gem 'sqlite3'

test.rb

require 'rubygems'
require 'bundler/setup'
require 'active_record'
require 'sqlite3'


def firstname(n)
  
end

ActiveRecord::Base.establish_connection(
    :adapter => 'sqlite3',
    :database => ':memory:'
  )

ActiveRecord::Base.connection.instance_eval do
  create_table :firstnames, :id => false do |t|
    t.string :firstname
  end
  
  add_index :firstnames, :firstname
end


class MyBase < ActiveRecord::Base
  self.abstract_class = true
end

class Firstnames < MyBase

end

class Firstnames2 < ActiveRecord::Base
  self.table_name = "firstnames"
  
end

puts "working: "
Firstnames2.create(firstname: 'john')

puts "\nbroken: "
# => test.rb:7:in `firstname': wrong number of arguments (0 for 1) (ArgumentError)
Firstnames.create(firstname: 'john')