Move backend setup into config.after_initialize

lib/delayed_job.rb

@@ -8,15 +8,6 @@
 Object.send(:include, Delayed::MessageSending)   
 Module.send(:include, Delayed::MessageSending::ClassMethods)
 
-if defined?(ActiveRecord)
-  Delayed::Worker.backend = :active_record
-elsif defined?(MongoMapper)
-  Delayed::Worker.backend = :mongo_mapper
-else
-  $stderr.puts "Could not decide on a backend, defaulting to active_record"
-  Delayed::Worker.backend = :active_record
-end
-
 if defined?(Merb::Plugins)
   Merb::Plugins.add_rakefiles File.dirname(__FILE__) / 'delayed' / 'tasks'
 end

rails/init.rb

@@ -0,0 +1,12 @@
+require 'delayed_job'
+
+config.after_initialize do
+  Delayed::Worker.backend ||= if defined?(ActiveRecord)
+    :active_record
+  elsif defined?(MongoMapper)
+    :mongo_mapper
+  else
+    Delayed::Worker.logger.warn "Could not decide on a backend, defaulting to active_record"
+    :active_record
+  end
+end

spec/spec_helper.rb

@@ -27,6 +27,8 @@
 
 DEFAULT_BACKEND = backends_available.first.to_sym
 
+Delayed::Worker.backend = DEFAULT_BACKEND
+
 backends_available.each do |backend|
   require "setup/#{backend}"
   require "backend/#{backend}_job_spec"