Revert "Revert "Fix rails#5667. Preloading should ignore scoping.""

This reverts commit 1166d49.

Conflicts:

	activerecord/test/cases/associations/eager_test.rb

activerecord/CHANGELOG.md

@@ -1,3 +1,9 @@
+## Rails 3.2.4 (unreleased) ##
+
+*   Association preloading shouldn't be affected by the current scoping.
+    This could cause infinite recursion and potentially other problems.
+    See GH #5667. *Jon Leighton*
+
 ## Rails 3.2.3 (unreleased) ##
 
 *   Added find_or_create_by_{attribute}! dynamic method. *Andrew White*

activerecord/lib/active_record/associations/preloader/association.rb

@@ -77,7 +77,7 @@ def associated_records_by_owner
             # Some databases impose a limit on the number of ids in a list (in Oracle it's 1000)
             # Make several smaller queries if necessary or make one query if the adapter supports it
             sliced  = owner_keys.each_slice(model.connection.in_clause_length || owner_keys.size)
-            records = sliced.map { |slice| records_for(slice) }.flatten
+            records = sliced.map { |slice| records_for(slice).to_a }.flatten
           end
 
           # Each record may have multiple owners, and vice-versa
@@ -93,7 +93,8 @@ def associated_records_by_owner
         end
 
         def build_scope
-          scope = klass.scoped
+          scope = klass.unscoped
+          scope.default_scoped = true
 
           scope = scope.where(process_conditions(options[:conditions]))
           scope = scope.where(process_conditions(preload_options[:conditions]))