Acts_as_paranoid, aliasing and nested scopes in Rails 1.1


#1

I have a real problem with the acts_as_paranoid plugin. The aliasing of
find and so the nested scope does not seem to work at all, when
combining it with similar plugins.

The description:
I made a copy of ‘acts_as_paranoid’ in the plugin directory, renamed it
to ‘acts_as_very_new’(just a nonsense plugin for testing), and
simplified the code (original code of acts_as_paranoid can be found
here:
http://svn.techno-weenie.net/projects/plugins/acts_as_paranoid/lib/caboose/acts/paranoid.rb):

#--------------------------------------------------------------BEGIN
module VeryNew
#…
module ClassMethods
def acts_as_very_new
unless is_very_new?
class << self
alias_method :find_with_old, :find
end
end
include InstanceMethods
end
#…
end

module InstanceMethods #:nodoc:
#…

 module ClassMethods
   def find(*args)
     with_very_new_scope { find_with_old(*args) }
   end

   protected
     def with_very_new_scope(&block)
       with_scope({:find => {:conditions => 

["#{table_name}.updated_at > ?", (Time.new - 3.days)]} }, :merge,
&block)
end
end

end
end
#--------------------------------------------------------------END

As you can see, there’s no change in structure, it’s the same as the
original ‘acts_as_paranoid’ only with a different find-condition. Next I
added following code to a model:

#--------------------------------------------------------------BEGIN
class Book < ActiveRecord::Base
acts_as_paranoid
acts_as_very_new
#…
end
#--------------------------------------------------------------END

In a controller I did the following calls:

Book.find(:all)

SQL: SELECT * FROM books WHERE ((books.updated_at > '2006-05-08

11:38:33’) AND (books.deleted_at IS NULL))

Book.find_with_old(:all)

SQL: SELECT * FROM books WHERE (books.deleted_at IS NULL)

Book.find_with_deleted(:all)

SQL: SELECT * FROM books

Isn’t is strange? Shouldn’t “Book.find_with_deleted(:all)” generate a
“WHERE (books.updated_at > ‘2006-05-08 11:38:33’)” condition? The
problem seems to be in aliasing of find. When I switch the call order of
“acts_as_paranoid” and “acts_as_very_new” in the model, I get:

Book.find(:all)

SQL: SELECT * FROM books WHERE ((books.updated_at > '2006-05-08

11:38:33’) AND (books.deleted_at IS NULL))

Book.find_with_old(:all)

SQL: SELECT * FROM books

Book.find_with_deleted(:all)

SQL: SELECT * FROM books WHERE (books.updated_at > '2006-05-08

11:38:33’)

Has anyone an idea how to fix it?
Thanks in advance,
Dave