How do I turn off tinyint boolean emulation in Rails 3.2.2?

问题

As per the api docs:

If you wish to disable this emulation (which was the default behavior in versions 0.13.1 and earlier) you can add the following line to your application.rb file:

ActiveRecord::ConnectionAdapters::Mysql[2]Adapter.emulate_booleans = false

But when I do so, I get:

uninitialized constant ActiveRecord::ConnectionAdapters::Mysql2Adapter

回答1:

For someone see this topic later, I needed to require mysql2_adapter with full path in Rails 3.2.0;

module MyApp
  class Application < Rails::Application
    require 'active_record/connection_adapters/mysql2_adapter'
    ActiveRecord::ConnectionAdapters::Mysql2Adapter.emulate_booleans = false
  end
end

回答2:

I had the same issue that I think you had. But in my case I didn't want to turn off the tinyint emulates but only set some tinyint columns of a legacy database as Integer type and not boolean type. Searching, I found a solution to my problem. Matt Jones¹ showed the Rails code documentation² explaining how to:

class SomeModel < ActiveRecord::Base
    attribute :a_tinyint_1_column_that_isnt_a_boolean, Type::Integer.new
end

¹ https://www.ruby-forum.com/topic/201859
² https://github.com/rails/rails/blob/daffea59db118fce4247d335eabea026cc54d7bc/activerecord/lib/active_record/attributes.rb#L17

回答3:

The docs don't ask you to require activerecord in application.rb. Requiring it solved the problem.

来源：https://stackoverflow.com/questions/10038665/how-do-i-turn-off-tinyint-boolean-emulation-in-rails-3-2-2