2 files changed, 14 insertions, 10 deletions
diff --git a/activerecord/lib/active_record/scoping/default.rb b/activerecord/lib/active_record/scoping/default.rb
index cde4f29d08..d37d33d552 100644
--- a/activerecord/lib/active_record/scoping/default.rb
+++ b/activerecord/lib/active_record/scoping/default.rb
@@ -5,8 +5,17 @@ module ActiveRecord
 
       included do
         # Stores the default scope for the class.
-        class_attribute :default_scopes, instance_writer: false
+        class_attribute :default_scopes, instance_writer: false, instance_predicate: false
+
         self.default_scopes = []
+
+        def self.default_scopes?
+          ActiveSupport::Deprecation.warn(
+            "#default_scopes? is deprecated. Do something like #default_scopes.empty? instead."
+          )
+
+          !!self.default_scopes
+        end
       end
 
       module ClassMethods
@@ -111,11 +120,11 @@ module ActiveRecord
         end
 
         def ignore_default_scope? # :nodoc:
-          Thread.current["#{self}_ignore_default_scope"]
+          ScopeRegistry.value_for(:ignore_default_scope, self)
         end
 
         def ignore_default_scope=(ignore) # :nodoc:
-          Thread.current["#{self}_ignore_default_scope"] = ignore
+          ScopeRegistry.set_value_for(:ignore_default_scope, self, ignore)
         end
 
         # The ignore_default_scope flag is used to prevent an infinite recursion
diff --git a/activerecord/lib/active_record/scoping/named.rb b/activerecord/lib/active_record/scoping/named.rb
index 12317601b6..da73bead32 100644
--- a/activerecord/lib/active_record/scoping/named.rb
+++ b/activerecord/lib/active_record/scoping/named.rb
@@ -160,13 +160,8 @@ module ActiveRecord
 
           singleton_class.send(:define_method, name) do |*args|
             if body.respond_to?(:call)
-              scope = extension ? body.call(*args).extending(extension) : body.call(*args)
-
-              if scope
-                default_scoped = scope.default_scoped
-                scope = relation.merge(scope)
-                scope.default_scoped = default_scoped
-              end
+              scope = all.scoping { body.call(*args) }
+              scope = scope.extending(extension) if extension
             else
               scope = body
             end