gistfile1.rb

#NOW we do this, in our plugin app/helpers

module CatalogHelper
  def actual_methods
   'stuff'
   end
end

# This is very hard to over-ride in a sensible way in local app. 
# Instead, if we split things up:

module CatalogHelper
  include CatalogHelperBehavior
end

# that's IT, all the actual method sare in CatalogHelperBehavior. 
# No need for ActiveSupport::Concern here, I don't think, 
# just very straightforward ruby. 

# NOW... if the local app has no CatalogHelper, no problem, 
# it'll automatically use the one from the plugin

# If the local app DOES have a CatalogHelper, it will completely replace the
# one from the plugin. But no problem, as long as you #include....

# in local app:

module CatalogHelper
   include CatalogHelperBehavior # it'll get this from the plugin, great

   # and now we can individually over-ride whatever methods
   # from CatalogHelperBehavior we want, and not the others. 
end


# We'd want to stick to a VERY consistent convention here. Like XHelper
# always has a module XHelperBehavior with actual implementation, so
# when you over-ride locally, you can know you just put XHelperBehavior
# in there, and you are forwards compatible.