Relation#respond_to? should take second argument for responding to private methods

2 files changed, 9 insertions, 2 deletions

diff --git a/activerecord/lib/active_record/relation.rb b/activerecord/lib/active_record/relation.rb
index d7cd78593f..b82a7d44f7 100644
--- a/activerecord/lib/active_record/relation.rb
+++ b/activerecord/lib/active_record/relation.rb
@@ -142,8 +142,8 @@ module ActiveRecord
       create_new_relation(@relation.where(conditions))
     end
 
-    def respond_to?(method)
-      return true if @relation.respond_to?(method) || Array.method_defined?(method)
+    def respond_to?(method, include_private = false)
+      return true if @relation.respond_to?(method, include_private) || Array.method_defined?(method)
 
       if match = DynamicFinderMatch.match(method)
         return true if @klass.send(:all_attributes_exists?, match.attribute_names)
diff --git a/activerecord/test/cases/relations_test.rb b/activerecord/test/cases/relations_test.rb
index 1c344c0b48..8c1ce07e75 100644
--- a/activerecord/test/cases/relations_test.rb
+++ b/activerecord/test/cases/relations_test.rb
@@ -146,6 +146,13 @@ class RelationTest < ActiveRecord::TestCase
     end
   end
 
+  def test_respond_to_private_arel_methods
+    relation = Topic.scoped
+
+    assert ! relation.respond_to?(:matching_attributes)
+    assert relation.respond_to?(:matching_attributes, true)
+  end
+
   def test_respond_to_dynamic_finders
     relation = Topic.scoped