3 files changed, 11 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index 34e643b2de..38b720ffc8 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -313,6 +313,13 @@ module ActiveRecord
       klass.current_scope = previous
     end
 
+    def _exec_scope(*args, &block) # :nodoc:
+      @delegate_to_klass = true
+      instance_exec(*args, &block) || self
+    ensure
+      @delegate_to_klass = false
+    end
+
     # Updates all records in the current relation with details given. This method constructs a single SQL UPDATE
     # statement and sends it straight to the database. It does not instantiate the involved models and it does not
     # trigger Active Record callbacks or validations. However, values passed to #update_all will still go through
diff --git a/activerecord/lib/active_record/relation/delegation.rb b/activerecord/lib/active_record/relation/delegation.rb
index 4b16b49cdf..27450ab8b3 100644
--- a/activerecord/lib/active_record/relation/delegation.rb
+++ b/activerecord/lib/active_record/relation/delegation.rb
@@ -82,6 +82,9 @@ module ActiveRecord
           if @klass.respond_to?(method)
             self.class.delegate_to_scoped_klass(method)
             scoping { @klass.public_send(method, *args, &block) }
+          elsif defined?(@delegate_to_klass) &&
+            @delegate_to_klass && @klass.respond_to?(method, true)
+            @klass.send(method, *args, &block)
           elsif arel.respond_to?(method)
             ActiveSupport::Deprecation.warn \
               "Delegating #{method} to arel is deprecated and will be removed in Rails 6.0."
diff --git a/activerecord/lib/active_record/scoping/named.rb b/activerecord/lib/active_record/scoping/named.rb
index 752655aa05..a784001587 100644
--- a/activerecord/lib/active_record/scoping/named.rb
+++ b/activerecord/lib/active_record/scoping/named.rb
@@ -183,7 +183,7 @@ module ActiveRecord
           if body.respond_to?(:to_proc)
             singleton_class.send(:define_method, name) do |*args|
               scope = all
-              scope = scope.instance_exec(*args, &body) || scope
+              scope = scope._exec_scope(*args, &body)
               scope = scope.extending(extension) if extension
               scope
             end