Identity map not cleared

[doxavore]

The Mongoid::IdentityMap should probably be cleared between job runs, as it is for ActiveRecord in:
https://github.com/collectiveidea/delayed_job/blob/5c7628d40c9e2e26ab2076453ab6488df3464730/lib/delayed/backend/base.rb#L92

[gurgeous]

This is a very serious issue. It causes nearly all non-trivial uses of DJ+Mongoid to fail in mysterious ways. I hacked this together as a workaround:

#
# clear Mongoid::IdentityMap before each job
#

module Delayed
  module Plugins
    class ClearIdentityMap < Plugin
      callbacks do |lifecycle|
        lifecycle.before(:invoke_job) do |worker, &block|
          Mongoid::IdentityMap.clear
        end
      end
    end
  end
end

Delayed::Worker.plugins << Delayed::Plugins::ClearIdentityMap

[doxavore]

That's much cleaner than what I've been using... but I feel this should be fixed in this project. Any thoughts from @collectiveidea ? 👍

[iamnader]

hey guys, any thoughts on this?

[jbescoyez]

I ran into serious trouble because of this issue 👍

[ulitiy]

+1

[sferik]

Can someone please put together a pull request with tests that fail on master?

[srleo]

I put the code from @gurgeous into a pull request. #38