support for rails 4.0

[hasimo]

i tested it with rails 3.2.12 and rails 4.0.0beta1.
rake spec was all passed.

[sferik]

I think the constraint should be ['>= 3', '< 5']. We know that the current delayed_job code works on Rails 3 or Rails 4. I'm not confident that it will work with all future versions of Rails ever released, which is what this constraint specifies.

Please see this blog post by @wycats: Using >= Considered Harmful (or, What’s Wrong With >=)

[agrobbin]

spec/spec_helper.rb:44:

class Story < ActiveRecord::Base
  self.primary_key = 'story_id'
  def tell; text; end
  def whatever(n, _); tell*n; end
  default_scope where(:scoped => true)

  handle_asynchronously :whatever
end

Something else I noticed while testing this with Rails 4 is that the default_scope needs to be set like this:

default_scope { where(:scoped => true) }

[sferik]

@agrobbin Thanks! I applied this change in b90a3a4.

[sferik]

I guess I'll merge this the dependency specification myself.