3 files changed, 19 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/associations/preloader/association.rb b/activerecord/lib/active_record/associations/preloader/association.rb
index 85343040db..698fd29beb 100644
--- a/activerecord/lib/active_record/associations/preloader/association.rb
+++ b/activerecord/lib/active_record/associations/preloader/association.rb
@@ -114,8 +114,18 @@ module ActiveRecord
             @reflection_scope ||= reflection.scope_for(klass)
           end
 
+          def klass_scope
+            current_scope = klass.current_scope
+
+            if current_scope && current_scope.empty_scope?
+              klass.unscoped
+            else
+              klass.default_scoped
+            end
+          end
+
           def build_scope
-            scope = klass.default_scoped
+            scope = klass_scope
 
             if reflection.type
               scope.where!(reflection.type => model.base_class.sti_name)
diff --git a/activerecord/lib/active_record/reflection.rb b/activerecord/lib/active_record/reflection.rb
index 4f53280b5c..1026e20f79 100644
--- a/activerecord/lib/active_record/reflection.rb
+++ b/activerecord/lib/active_record/reflection.rb
@@ -219,8 +219,10 @@ module ActiveRecord
       end
 
       def klass_join_scope(table, predicate_builder) # :nodoc:
-        if klass.current_scope && klass.current_scope.values.empty?
-          klass.unscoped
+        current_scope = klass.current_scope
+
+        if current_scope && current_scope.empty_scope?
+          build_scope(table, predicate_builder)
         else
           klass.default_scoped(build_scope(table, predicate_builder))
         end
diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index c5d98e970a..d9e1e5c39c 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -642,6 +642,10 @@ module ActiveRecord
       "#<#{self.class.name} [#{entries.join(', ')}]>"
     end
 
+    def empty_scope? # :nodoc:
+      @values == klass.unscoped.values
+    end
+
     protected
 
       def load_records(records)