RoR extend ActiveRecord::relation with undestroy_all

Question

I basically want to the following function, but in the reverse, and i already have the undestroy function working for single classes.

https://github.com/rails/rails/blob/2ad168ee41d590bd9a4d15eddf3c2f719c23b60a/activerecord/lib/active_record/relation.rb#L364

However, I am trying to to extend ActiveRecord::Relation to no avail. Here's how i do it for other methods by for ActiveRecord::Base

ActiveRecord::Base.extend Track::BaseTrack

But using ActiveRecord::Relation.extend Track::TrackRelation doesn't seem to do anything. The module TrackRelation (inside Track) is:

  module TrackRelation

      def undestroy_all(conditions = nil)
        if conditions
          where(conditions).undestroy_all
        else
          to_a.each {|object| object.undestroy }.tap { reset }
        end
      end

  end

Am I using the correct ActiveRecord class for relations?

The error is:

undefined method "undestroy_all" for #<ActiveRecord::Relation []>

Answer 1

When you call ActiveRecord::Relation.extend Track::TrackRelation you are mixing the Track::TrackRelation methods into ActiveRecord::Relation as class methods.

What you want to do is mix in those same methods as instance methods. You can do that using include rather than extend. However Module#include is private. So one way to achieve what you want is:

ActiveRecord::Relation.send(:include, Track::TrackRelation)