backport runner fixes to 3-2-stable

Add a runner hook to Rails::Application and Rails::Engine that requires
ActiveRecord::Base to avoid circular constant loading when using observers.

This commit backports cc7dd66, c0ba0f0 and 8d01c61.

1 files changed, 10 insertions, 0 deletions

diff --git a/railties/lib/rails/railtie.rb b/railties/lib/rails/railtie.rb
index 07a122e7d0..9eb7e7c65d 100644
--- a/railties/lib/rails/railtie.rb
+++ b/railties/lib/rails/railtie.rb
@@ -145,6 +145,12 @@ module Rails
         @load_console
       end
 
+      def runner(&blk)
+        @load_runner ||= []
+        @load_runner << blk if blk
+        @load_runner
+      end
+
       def generators(&blk)
         @generators ||= []
         @generators << blk if blk
@@ -179,6 +185,10 @@ module Rails
       self.class.console.each { |block| block.call(app) }
     end
 
+    def load_runner(app=self)
+      self.class.runner.each { |block| block.call(app) }
+    end
+
     def load_tasks(app=self)
       extend Rake::DSL if defined? Rake::DSL
       self.class.rake_tasks.each { |block| self.instance_exec(app, &block) }